ASSESSING THE STATUS OF LANDSLIDES ALONG KEY TRANSPORT ROUTES IN THUA THIEN HUE PROVINCE DURING THE STORMY SEASON IN 2020

Abstract

The purpose of this paper is to provide a scientific basis for solutions to limit landslides
along key transport routes in Thua Thien Hue province. Group researcher has a survey, data
collection, and analysis, in combination with GIS application, and apply the slip coefficient criteria to establish a landslide risk map along traffic routes at a rate of 1/250,000. The results of the study show that: Ho Chi Minh Road (National Highway 14) has 53 landslide points, mainly very large and large scale; National Highway 49A has 49 landslide points with a large and medium scale; Provincial routes 14B, 16 has 10 landslide points medium scale. Initially, the points are at high risk of slippage, mainly at Ho Chi Minh Road (National Highway 14). National Highway 49A has many high-risk points of slippage. Provincial roads are at very high risk of landslides because there are no carpets covered by burning and acacia auriculiformis extraction. Notably, the risk of landslides increases during the rainy season. This assessment shows the need for synchronous implementation of
construction and non-construction solutions to limit landslides to contribute to socio-economic sustainable development planning for localities in Thua Thien Hue province.

Full text

INNOVATIVE GEOSCIENCES,
CIRCULAR ECONOMY AND SUSTAINABILITY

International Symposium
HANOI GEOENGINEERING 2022
INNOVATIVE GEOSCIENCES, CIRCULAR ECONOMY
AND SUSTAINABILITY
11-12 February 2022
Organized by:
Supported by:

ADVISORY COMMITTEE

ORGANIZATION COMMITTEE

SYMPOSIUM SECRETARIAT

TABLE OF CONTENTS
SECTION 1: SUSTAINABLE NATURAL RESOURCES FOR CIRCULAR ECONOMY

viii
SECTION 2: EARTH AND GEOENGINEERING GEO-ECOLOGICAL ECHNOLOGIES
FOR CIRCULAR AND ECOLOGICAL ECONOMY

ix
SECTIONS 3: SOLUTIONS FOR CIRCULAR ECONOMY AND SUSTAINABILITY
MULTISECTOR COLLABORATION TO ADDRESS A WICKED

x

xi

xii

PREFACE

2

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ASSESSING THE STATUS OF LANDSLIDES ALONG KEY TRANSPORT ROUTES
IN THUA THIEN HUE PROVINCE DURING THE STORMY SEASON IN 2020
Nguyen Hoang Son1,2, Le Van Tin2, Mai Van Chan2,
Phan Huu Thinh3, Doan Xuan Tu4, Nguyen Ngoc Dan2
1Open Education and Information Technology, Hue University, Thua Thien Hue provice, Vietnam
2University of Education, Hue University, Thua Thien Hue provice, Vietnam
3Nguyen Khoa Thuyen Secondary School, Thua Thien Hue provice, Vietnam
4Nguyen Truong To high school, Hue University, Thua Thien Hue provice, Vietnam
Corresponding author: nhsonsp@hueuni.edu.vn
Abstract: The purpose of this paper is to provide a scientific basis for solutions to limit landslides
along key transport routes in Thua Thien Hue province. Group researcher has a survey, data
collection, and analysis, in combination with GIS application, and apply the slip coefficient criteria
to establish a landslide risk map along traffic routes at a rate of 1/250,000. The results of the study
show that: Ho Chi Minh Road (National Highway 14) has 53 landslide points, mainly very large and
large scale; National Highway 49A has 49 landslide points with a large and medium scale; Provincial
routes 14B, 16 has 10 landslide points medium scale. Initially, the points are at high risk of slippage,
mainly at Ho Chi Minh Road (National Highway 14). National Highway 49A has many high-risk
points of slippage. Provincial roads are at very high risk of landslides because there are no carpets
covered by burning and acacia auriculiformis extraction. Notably, the risk of landslides increases
during the rainy season. This assessment shows the need for synchronous implementation of
construction and non-construction solutions to limit landslides to contribute to socio-economic
sustainable development planning for localities in Thua Thien Hue province.
Keywords: Landslides; Risk of landslides; National highways; Provincial highways; Thua Thien Hue.
Slippage is the phenomenon of instability and displacement of slopes, sloping roofs,
destabilizing buildings, burying people and property, destruction of farming areas and
habitats, leading to major disasters for people and society. This is a natural disaster is a
relative common in the hills of Vietnam especially along newly built roads, and roads are
being widened or straightened. Dozens of large-scale landslides have thousands of rock
blocks collapsed onto the road, causing traffic jams and threatening people's lives and
activities. Ho Chi Minh road (National Highway 14) has 53 landslide points, mainly of
very large and large scale, total landslide area: 15,779 m2 and landslide volume: 204,829 m3.
The risk of landslides is very high; National Highway 49A has 49 landslide points, high
risk of landslide, total landslide area: 10,533.13 m2 and landslide volume: 248,777,125 m3;
Provincial roads 14B, 15, 16 have very few landslides along the route, but the risk of
landslides is high. The initial assessment of the causes of landslides is due to
(1) Meteorological - hydrological factors have the strongest impact; (2) Topographic
factors - geomorphology (sliding points mainly occur in the range of terrain slope 15o - 35o);
(3) Human factors (acacia mining areas, slash-and-burn cultivation along the roads and
the design of the slopes or construction that are not suitable with the geological
characteristics have caused landslides); and (4) Geological factors (slides mainly occur in

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rocks belonging to the group of metamorphic rocks rich in alumosilicates, followed by
rocks in the terrigenous, terrigenous - eruptive sedimentary rocks). Properly analyzing
the current situation and assessing the risk of landslides along key transport routes in the
western mountainous region plays an essential role in the locality's socio-economic
development and the whole province of Thua Thien Hue.
The data of this paper are sources from the map, including a geological map of Thua
Thien Hue province at 1/200,000 scale, a traffic map of Thua Thien Hue province at
1/25,000 scale, and topographic map of Thua Thien Hue province at the scale of 1/25,000.
Hydrometeorological data is collected from monitoring stations, Center for
Hydrometeorology of Thua Thien Hue province (Thua Thien Hue province, 2021) (Son N.H.
and Hang P.A., 2010). In addition, information about the current status, characteristics, and
signs of landslides on the roads are collected directly in the fieldwork. Research materials are
collected from topics and articles of domestic and foreign scientists. Those data sources are
inherited, selected, and served for the research and establishment of landslide risk maps along
crucial traffic routes in Thua Thien Hue province (Son N.H. et al., 2010), (Son N.H.,2010).
The group researcher has analyzed qualitative and quantitative data, technical
parameters, building maps, charts and tables, information boxes in thematic reports,
general reports on the current state of landslides. Along the key traffic routes in Thua
Thien Hue province, the study focuses on analyzing the characteristics of topography,
geology, geomorphology, hydro-meteorological factors from the general geographical
point of view to clarify the mechanism of causing landslides. It is possible to classify the
scale and properly assess the risk of landslides along the traffic routes based on the
systematic, causal interaction between natural factors and human impacts in the process
occurrence and development of landslide hazards.
In November and December 2020, the research team conducted five surveys and actual
measurements on National Highway 14 (Ho Chi Minh Road), National Highway 49A,
Provincial Road 14B, 16. In May and September 2021, the research team will continue to
conduct field investigations and surveys to help verify the accuracy of the information on
the current state of landslides from 2020. The use of handheld rangefinders machines and
GPS positioning, combined with actual measurements, has provided accurate data on
location, scale, as well as an initial assessment of landslide risk. Finally, the group researcher
determines the causes and factors affecting the landslide phenomenon in the locality.

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GIS enables spatial analysis, management, integration, and superposition of
information layers. Combined with the field survey method, the study uses the Global
Positioning System (GPS) to accurately determine the geographic coordinate system of
landslide and landslide points. After decentralizing, analyzing, and synthesizing factors,
ArcGIS software and Mapinfo 15 created a landslide risk assessment map along key
traffic routes in Thua Thien Hue province.
The study uses the landslide coefficient (quantitative factor) to decentralize scale. The
coefficient is calculated according to Ktl = Stl/Sdg (Son N.H. et al. (2010). In which: Ktl:
landslide coefficient; Stl: landslide area (m2); Sdg: surface area of the slope with a landslide (m2).
If: Ktl > 0.5: Slope has a very high risk of the landslide; Ktl from 0.3 - 0.5: Slope has high
risk of landslide; Ktl from 0.1 - 0.3: Slope has medium landslide risk; Ktl from 0.01 to
0.1: Slope has low landslide risk; Ktl < 0.01: Slope has very low landslide risk.
The 105 km long Ho Chi Minh road passes through the territory of A Luoi district
and is considered the main traffic axis, playing an important role in socio-economic
development and ensuring national security and defense for the western border region.
Survey results in 2020, 2021 show that there are 53 landslide points along the route. In
which, small landslide (sliding area less than 10 m2): 1 point, medium landslide (slide
area 10 - 50 m2): 18 points, large landslide (slide area 50 - 100 m2): 8 points, very large
landslide (slide area over 100 m2): 26 points. Landslide density: 0.50 points/km. The
landslide area is 15,779 m2 and 204,829 m3 land (Figure 1, Table 1, Figure 2).
Table 1 shows that the road from Hong Thuy commune to Hong Van commune
located in the north of A Luoi district (adjacent to Quang Tri province), with a length of
about 25 km, has 20 large landslides (slide area 50 - 100 m2), mainly medium landslides
(slide area 10 - 50 m2), there are four very large landslides (slide area over 100 m2). The
total landslide area is 1,224 m2; the landslide volume is 4,328.5 m3, the landslide density
is 0.8 points/km. The section Hong Trung - Huong Lam has a length of 43 km, the terrain
is flat, running through the A Luoi valley has appeared 18 landslides, mainly are medium
sized landslides (slide area 10 - 50 m2), and very large landslides (slide area over 100 m2),
landslide density is nearly 0.41 points/km. The total landslide area was 5,689.5 m2, and
the landslide volume is 59,652.5 m3. The section from A Roang commune to Huong
Nguyen commune (adjacent to Quang Nam province) has a total length of 35 km; there

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are 15 point landslides with very large scale (slide area over 100 m2), the landslide area
is 7,813 m2, and the landslide volume is 13.7143 m3, landslide density 0.43 points/km.

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National Highway 49A, 97.5 km long, is the lifeline of the East-West economic
corridor, connecting from the border gates of the Lao People's Democratic Republic to
the seaports of Thua Thien Hue province. The route is critical, creating a driving force
for socio-economic development in the Vietnam - Laos border area, ensuring security and
defense for Thua Thien Hue province.
The survey results in 2020 and 2021 show that there are 49 landslides along National
Highway 49A. The landslide area was 10,533.13 m2, and the landslide volume was
248,777,1 m3. The landslides occurred mainly from Huong Tra town to Ho Chi Minh
road. The road going through Huong Tra town has very few landslides, mainly small and
medium sized landslides (slide area 10 - 50 m2). The frequency and scale of landslides
increased when passing through A Luoi district (Figure 1, Table 2, Figure 3).

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Survey results show that, in Thua Thien Hue province, landslides on provincial roads only
occur mainly on provincial road 14B and provincial road 16. Provincial road 14B has nine
landslide points with a landslide area of 8,392 m2 and a volume of 11,497 m3. Provincial road
16 has 1 landslide of medium-scale at position 16°27'38''N, 107°27'60''E (Figure 1, Table 3).

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The factors: Meteorology - Hydrology, topography - geomorphology, geology, and
human life have different roles in causing landslides along key traffic routes in Thua
Thien Hue province (Figure 4).
Meteorological - hydrological factors
Hydro-meteorological characteristics, namely cumulative rainfall, storm winds, the
density of rivers and streams, and groundwater-surface, are the triggering factors for
landslides. Statistical results show that traffic routes passing through A Luoi district have
the highest density and scale of landslides. The points where landslides occur along the
roads usually have more than 300 mm of rain in 24 hours. The rainfall here is very large

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(the average total rainfall is from 2800 mm to 3400 mm). The rainy season lasts from
May to October, with two peaks in October (900 - 1000 mm) and May (220 - 230 mm).
In 2020, rainfall in A Luoi was 6783 mm, reaching 189% of the average of 5 years. In
October 2020 alone, the measured rainfall was 3449 mm, accounting for 50.8% of the
annual rainfall. The heavy rain, concentrated in a short time, activates potential landslides.
The areas of Pe Ke Pass in the North, Hai Ham Pass in the South of Ho Chi Minh Road,
and the section of National Highway 49A often have high rainfall (rainfall per episode
greater than 100 mm) causing thousands of cubic meters of soil and rock to slide away
serious. In addition, the rainfall has accumulated from 2-3 days before, combined with
slopes with a slope higher than 250 will make the areas Areas with soft ground, loose soil,
or soil on the slopes of ruins are prone to landslides.
The wind is also one meteorological factor with a relatively evident influence on
landslides along the roads. Strong winds caused by tropical storms will make the roots
and roots easily shaken, disrupting the soil structure, leading to a higher risk of landslides.
Besides, the density of rivers, streams is dense, and temporary flows create erosion
grooves that accelerate the process of landslides (Figure 5).
In addition, surveys and actual measurements of group research found that is
groundwater artery close to the road wall is also a significant risk for the process
landslides (Figure 6).
Geological factors
Ho Chi Minh road: In areas with a steep slope of over 300, such as in A Roang
commune, Hong Thuy commune. In addition, layers of clay-filled soils are capable of
retaining water cause soft soils and increasing landslides. Geology is composed of mixed
sedimentary rocks, so the structure is the least stable, quickly changed when the impact
of external factors causes landslides. The terrain high slope in the Southeast and
Northwest areas of A Luoi valley, so landslides occurred frequently. In general, landslides
mainly occur in metamorphic rocks rich in alumosilicates, followed by stones of the
terrigenous, terrigenous - eruptive sedimentary rocks (Figure 7).

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National Highway 49A: The bedrock layer is
mainly siltstone, sericite shale, and stone. Along the
route of National, Highway 49A is the destruction
zone in the northwest - southeast direction, the soil and
rock are strongly crushed. In addition, the combination
of terrain with many different factors has increased the
occurrence of landslides. For example, thick
weathered bark, vegetation (mainly shrubs and
grasses), and slopes from 30° - 35°
Provincial roads have a high risk of a landslide
because the steep walls are composed of mixed
sedimentary rocks (Figure 8). In addition, the loss of
vegetative cover due to acacia mining (Figure 9),
upland burning (Figure 10), and quarrying is the cause
of landslides in the rainy season.
Human factors
People's production activities are
one of the decisive factors for landslides
along key traffic routes in Thua Thien
Hue province. In particular, the
exploitation and transportation of acacia
along the roads (Figure 9), burning
activities that destroy vegetation on
slopes (Figure 10) are the main causes of
landslides. In addition, the design of talus
roofs that are too high and too steep is not
suitable for geological features (Figure 11)
and mining activities at roadside quarries
also pose a risk of landslides.
Topographic factors - geomorphology
Landslides mainly occur in high terrain areas, with steep slopes and dissections creating
large topographical energy favorable for gravity - derived landslides (Son N.H., 2011;
Tham N. and Son N.H., 2008). The topography of the Ho Chi Minh road corridor area
has high characteristics in the North and South and low in the center. On either side are
two mountain ranges over 1000 m high. Most of the landslides mainly occurred in the
range of terrain slope 15o - 35o in the north and south of the route, and a few occurred in
the slope range of 35o - 55o. National Highway 49A has low terrain in the areas. The road

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section belongs to Huong Tra town, so the landslides are few and of medium and small
scale. In the western area of A Luoi district, the terrain is higher, the more landslides
occur, and the larger the size of the landslides in the areas with slopes from 30° - 35°
(Figure 12). The landslides along provincial roads are of medium and small scale due to
the small steepness of the cliff (Figure 13).
To assess landslide risk along key traffic routes in Thua Thien Hue province, in
addition to the cause and status criteria, the authors use additional landslide coefficients.
Preliminary results of landslide risk assessment along key traffic routes in Thua
Thien Hue province are shown in Table 4, Figure 14.
The calculation results show that:

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- The risk of landslides occurs most at Ho Chi Minh road with 53 points, and the
total landslide volume is 20,4829 m3. The risk of landslides mainly occurs in the North
of A Luoi district (adjacent to Quang Tri province) and the section from A Roang to
Huong Nguyen, (adjacent to Quang Nam province) where there are high mountains, the
road winding, and large annual rainfall (3,500 - 4,000 mm/year).
- The risk of landslides on National
Highway 49A occurs mainly along the
route in Huong Nguyen, Hong Ha, Son
Thuy, and Phu Vinh communes, where
the terrain slopes about 30° - 35°,
especially vegetation are shrubs and
grasses. The bedrock is siltstone,
sericite shale, sandstone, weathered
crust 5-10 m thick, mainly silt sand and
clay powder.
- Routes 14B, 16 have a high risk of
a landslide because the vegetation here is mainly grass, shrubs, and acacia. The
phenomenon of upland burning and acacia exploitation causes the surface to lose its
cover, and the risk of landslides occurs when heavy rains last a long time. In addition, the
quarries are also at high risk of landslides.
Monitoring and warning of the risk of landslides
- There should soon be training courses to guide the implementation content in
landslide monitoring and equip specialized staff with basic and essential equipment for
updating the necessary data set. Close monitoring of landslides and their evolution
regularly is essential for timely and effective prevention of landslide hazards, and at the
same time, minimizing the risks caused by landslides caused.

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- Warning of landslide hazard is important. For the warning problem to have great
significance for each locality, more specific and detailed investigation data should be
conducted to conclude the zoning. In the immediate future, it is advisable to invest in
additional research, and assessment on the scope of key socio - economic development
zones and residential areas on the route warned of high risk of landslides to apply solutions.
In addition, the specific warning of landslide risk contributes to building regional or
regional planning, ensuring sustainable socio-economic development and security.

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Planning management
For each commune or economic development area's size, the landslide warning
zoning results are the initial scientific bases that can be consulted or adjusted to suit the
actual situation of landslide prevention. In the immediate future, special attention must
be paid to areas where severe landslides have occurred, and at the same time, must be
warned level is the high-risk range. A big issue that needs to be mentioned in planning
management is the development of the centers of mountainous communes in Thua Thien
Hue until 2025, with a vision to 2030. Thua Thien Hue province need planning and
management about use land structure to be strictly implemented along key transport routes.
In the current situation, the form of land use often fluctuates according to socio - economic
development. Under conditions of loose or irregular management, this situation will give
rise to an increase in landslides. Therefore, the issue of rational exploitation and use of
land has an important practical significance in preventing landslides.
People Management
Managing people manifests in two aspects: managing human activities that promote
landslide risk; and guiding people to implement measures to prevent and limit landslides.
To do well both of the above contents requires enlightenment, people's understanding,
and the attention from all levels of government. Managing to prevent human activities
that promote landslide risk includes some of the following:
- Monitoring to minimize the phenomenon of indiscriminate deforestation for any
purpose. Strong enough measures must be taken to protect protected forests and
watershed forests. Furthermore, increased investment in afforestation is required to green
bare land and bare hills.
- Long-term land allocation to households for forest gardens and production forests
near villages. For production, forests far from the village should be included in the
sustainable forest management program. The forbidden forest is a form that is highly
encouraged and respected both in terms of environment and culture. Critical protection
forests and special-use forests are under the management of the forestry enterprise, and
the management boards have protection contracts with local communities.
- Local governments must devise strategies to restrict fires that destroy vegetation
and shift the production area of mountain people, as well as to concentrate people living
and producing in a stable location for an extended period of time. Do not build civil and
community works in places where landslides are complicated, where soils and rocks have
thick weathered crust within the influence of modern geodynamic zones, such as along
the national highway 49A or Ho Chi Minh Road, the section from A Dot to A Roang, the
part of the road belonging to Pe Ke Pass.

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- People who live and work near transportation routes need to be informed about the
current state and causes of landslides. One of these is studying, producing materials that
are easy to grasp so that they can be widely disseminated to local people.
- The design of transportation routes that run over steeply sloping hillside areas
should be carefully considered. In the event of a landslide, it is vital to use multiple
technical solutions at the same time to eliminate the risk of landslides. First and foremost,
do not construct highways over an underground stream. Second, to avoid landslides, the
construction must ensure enough ventilation and the long-term viability of the pier
foundation. Finally, those unlawfully exploiting minerals along the road can be stopped
by aggressively enforcing mineral protection rules.
Build a landslide warning map
The landslide warning maps along the key traffic routes of Thua Thien Hue province
are a type of map containing a lot of information of a complex nature. In the team study,
geosynthetic methodologies based on the entire inheritance of information on
fundamental maps and actual data were used. Finally, make a landslide potential map and
send out landslide warnings for specific types of landslides.
Educational solutions to guide landslide prevention
Landslide prevention should be guided by educational solutions. To begin,
individuals must be educated about the different types of landslides that can occur in their
area. Second, discuss the causes of landslides, with a focus on man-made factors that
contribute to landslides. Third, educate people about the importance of voluntarily
implementing laws and sub-law documents that protect natural resources (forests, land,
minerals) and civil works in order to manage their actions and reduce the risk of
landslides. Finally, public awareness campaigns are being launched to encourage people
to participate in the state's major policies on greening dry land and bare hills, conserving
watershed protection forests, and helping to landslide mitigation.
Mitigation solutions
According to statistics, those solutions have had particular effects. However, many
places continue to slide so far, destroying concrete dams, gabion barriers, and even
landslides that kill hundreds of meters of road.
The positive slopes are located within the route, adequately designed, and do not
slide over the allowable limit height. Therefore, using measures to reinforce the talus with
retaining walls, planting grass, and anti-slip shrubs are practical solutions. To keep the
retaining wall safe and sustainable, we need to determine the forces acting (earth pressure

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and the vehicle's load). In addition to the above task, the use of retaining walls is still
limited, encroaching on land because the foot of the excavation and backfill must be
widened to reach the design slope at places of deep excavation and embankment.
Prevention solutions
People who want to choose appropriate prevention solutions for each case need to
consider the slope factors. For natural slopes, it is difficult to analyze the occurrence of risks
because causes such as erosion over time, slippage between rock layers, and vegetation
growing on slopes have local potential, unstable factors (cracks, grain, slippage). The ridge
slope and other factors combined are essential bases for assessing risk occurrence.
The proactive prevention solution is to keep the rock mass stable, ensuring the
elimination of the cause of landslides. Planting soil-holding grass, planting bushes in rows
to create a draining bank for the top layer, or planting moderate-height trees on slopes
and dug roadways, for example, can all be used to generate natural mulch. Furthermore,
the outer layer is weathered cracked rock with little or no clay, which is covered with
strong injection-molded concrete to sustain the slope. On the Pe Ke pass and A Roang
area segment, this safeguard was implemented in some sliding blocks.
The anchor form is made of steel rods, with a leg pre-attached to the hole drilled on
the cliff. The axial bearing capacity of the anchor depends on the characteristics of the
pre-buried, the cross-section, and the number of the steel bar.
Passive solutions include building retaining walls and isolation walls for landslides
that are pretty large or spread out along the route. The barrier forms an obstacle to prevent
rocks from falling directly or rolling suddenly onto the road surface. The height of the
wall is reasonably determined so that it is sufficient to block most of the rock mass that
can slide down the road. Therefore, the barrier is made of a structure that is easily
deformed to dissipate the energy of the falling motion of the body against the obstacle,
which is a rigid structure but easily moved or deformed into a herd return.
+ The net barrier layer is usually to passively prevent when a falling rock mass cannot
penetrate the path. The mesh barrier consists of studs that hold the factory pre-woven wire
mesh (such as the B40 mesh). Furthermore, depending on the topography of each place,
the net shield is held tightly by stretching steel bars, using nails to fasten to the wall.
+ The precast concrete block overlaps the barrier layer to form a heavy alliance. The
connection of concrete blocks together ensures to withstand the strong impact of the rock mass.
+ The overpass works include corridors to block soil and rock and break the slopes
according to the level. Halls are built to prevent soil and rocks from falling directly onto
the road surface but being moved over the top of the building and rolling out.

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Through studying and surveying landslides on key traffic routes in Thua Thien Hue
province, we come to some general conclusions as follows:
- Landslides along the main traffic routes in Thua Thien province mainly occurred on
some main ways: Ho Chi Minh road, National Highway 49A, provincial roads 14B, 16.
Landslides on Ho Chi Minh road are concentrated mainly in the North and South; there
are few landslides in the central part of A Luoi. Large-scale landslides along National
Highway 49A are primarily focused in A Luoi district with slopes from 25 to 350.
- The main causes of landslides include meteorological - hydrological factors (the
strongest impact), topographical - geomorphological factors (slides mainly occur in the
range of terrain slopes 150 - 350), human factors (acacia mining areas, slash-and-burn
cultivation along the roads, and the design of talus roofs or construction that are not
suitable with geological features have caused landslides), geological factors.
- Based on evaluation criteria of landslide coefficient and integrated analysis of
factors affecting landslide. We have built a landslide hazard map along key traffic routes
in Thua Thien Hue province with 126 points of landslide risk at different levels. Ho Chi
Minh road has the highest risk of landslides with 53 points (of which 18 are very high
risk, 13 are at high risk). National Highway 49A has 49 landslide points (in which the
number of points with a very high risk of landslide is 11 points, the number of points with
a high risk of landslide is 25 points). Provincial roads have 10 points with a very high risk
of landslides. The main cause of the risk of landslides on provincial roads is people
burning the fields and exploiting acacia. In which, provincial road 14B has 1 point with
a very high risk of landslides, and provincial road 16 has 9 points with very high risk.
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Thua Thien Hue province”, Decision No. 1789/QD-UBND dated 22/07/2021, Hue.
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Conference, Recruitment Collection of scientific reports, page 867. Natural Science and Technology
Publishing House.
3. Son N.H. and Hang P.A. (2010). “Evaluation of the process of landslides along the Ho Chi Minh road
corridor, the section through Thua Thien Hue province. period 2005 - 2009”. Journal of Research and
Development, Department of Science and Technology Thua Thien Hue, 2010, Number: 6 (83).

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4. Son N.H. et al. (2010). “Study and warn of the risk of landslides and flash floods along the corridor of
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minimize damage”. Summary report on the topic of the Ministry of Education and Training, code
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route section through Thua Thien Hue province”. Journal of Science - Hanoi National University,
2011, Issue: 4S.
6. Tham N. and Son N.H. (2008). “Research on flash flood situation in Huong river basin, Thua Thien
Hue province and prevention measures”. Scientific and educational journal. Hue University of
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Mã số: 1K-04ĐH2022
In 200 bản, khổ 19x27 tại Công ty Cổ phần in và Thương mại Ngọc Hưng
Địa chỉ: Số 296 đường Phúc Diễn, tổ dân phố số 1, P. Xuân Phương, Q. Nam Từ Liêm, Hà Nội
Cơ sở sản xuất: Số 460 Trần Quý Cáp, Đống Đa, Hà Nội
Số xác nhận đăng ký xuất bản: 254-2022/CXBIPH/04-19/ĐHQGHN, ngày 21/01/2022.
Quyết định xuất bản số: 01 KH-TN/QĐ-NXB ĐHQGHN ngày 21/01/2022.
In xong và nộp lưu chiểu năm 2022.
Chịu trách nhiệm xuất bản: Giám đốc: TS. PHẠM THỊ TRÂM
Chịu trách nhiệm nội dung: Tổng Biên tập: TS. NGUYỄN THỊ HỒNG NGA
Biên tập: NGUYỄN THỊ THỦY
Chế bản: VÕ SINH VIÊN
Trình bày bìa: NGUYỄN NGỌC ANH
NHÀ XUẤT BẢN
ĐẠI HỌC QUỐC GIA HÀ NỘI
16 Hàng Chuối - Hai Bà Trưng - Hà Nội
Giám đốc – Tổng biên tập: (024)39715011
Hành chính: (024)39714899; Fax: (024)39724736
Quản lý xuất bản: (024) 39728806
Biên tập: (024) 39714896
INTERNATIONAL SYMPOSIUM HANOI GEOENGINEERING 2022:
INNOVATIVE GEOSCIENCES, CIRCULAR ECONOMY AND SUSTAINABILITY

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