Luís Ribeiro e Sousa

University of Porto | UP · Departamento de Engenharia Civil

The control and early warning of landslide induced by rainfall have always been the emphasis and difficulty of geological disaster prevention and mitigation. In this study, a slope similarity model was developed based on the landslide at Xiongjia Mountain quarry in Yingjiang County, Yunnan Province, China. A new type of the negative Poisson’s ratio...

No âmbito dos estudos de alta velocidade ferroviária do eixo Lisboa – Madrid, foram iniciados estudos para análise de diversos cenários de soluções da travessia ferroviária do rio Tejo. T

In this work, the massive landslide of Daguangbao was modeled in 3D using the material point method (MPM). The paper focuses on modeling the failure, the run-out, and the final deposition of the failed mass in 3D. The numerical model considers in detail the distribution of materials within the domain. The materials were modeled as elastoplastic wit...

To satisfy the demand for protection against landslides, it is necessary to systematically assess and manage landslide hazards and risk. Landslide mechanisms are analyzed with focus in the major risks, and formal risk assessment methodologies are presented in the Lecture. Issues related to risk assessment are discussed and different steps are descr...

This presentation focuses on different risks on landslides. Landslides hazards can be systematically assessed by using decision making under uncertainty. The study focused on the role of water in the evaluation of landslide hazards. Landslide hazards include uncertainties in a deterministic and probabilistic form, model uncertainty in hydrologic mo...

The 2008 Wenchuan earthquake resulted in a large number of fatalities and caused significant economic losses, in China. Thousands of landslides, many of which are very large, were triggered by the earthquake. Most of these catastrophes were distributed along the Longmenshan fault system, on the edge of the Tibetan plate. Some of these landslides bl...

In this work, the massive landslide of Daguangbao was modeled in 3D using the Material Point Method (MPM). The paper focuses on modeling the failure, the run-out, and the final deposition of the failed mass in 3D. The numerical model considers in detail the distribution of materials within the domain. The materials were modeled as elastoplastic wit...

The Azores Archipelago is affected by several geohazards and natural disasters, including earthquakes, volcanic eruptions, and extreme meteorological events. This makes this region quite susceptible to landslides. To ensure the safety of natural slopes, it is vital to systematically assess and manage risk to propose measures to reduce the geotechni...

Slope instability is one of the major problems in geotechnical engineering. Slope instability affects both man-made and natural slopes and may cause significant economic damage, and sometimes injuries and loss of lives. During the construction of the Musandam Independent Power Plant (MIPP) in Northern Oman, a rock slope failure occurred on a benche...

Risk assessment involved in storage of CO2 in coal is analyzed, with particular emphasis on cases where the injection is made into unminable coal seams and in abandoned coal mines. The risks associate are studied in detail, different types of hazard scenarios are identified and described. The importance of modelling and monitoring is emphasized in...

Evaluation of geomechanical properties. Methodology for assessing the deformability of rock masses. Tests in boreholes. Plate load tests. Large Flat Jack tests- Laboratory tests. Rock mass investigations in Japan,

Evaluation of strength and in situ state of stresses. Strength assessment methodology. Sliding and shear tests in situ. Cutting tests in drillholes. Laboratory tests in discontinuities. Characterization of the state of stress in situ Hydraulic fracturing. Small flat jacks, Overcoring techniques.

Empirical systems and the Use of Artificial Intelligence techniques. Classifications of empirical systems. RMR system. Q system. GSI system. Empirical systems to volcanic rocks. Hierarchical characterization processes. Data Mining techniques. Applications to a hydroelectric scheme and to an underground laboratory in USA.

Slope instabilities present significant geotechnical problems involving a variety of geomaterials in different geological and climatic environments. These phenomena, which can be natural or man-made, are difficult to predict because their initiation depends on many factors. Man-made slopes are expected in a large number of civil and mining engineer...

Underground energy storage plays an important role in electric energy supply systems. Hydroelectric power schemes are important undertakings that can make use of underground space and storage of energy. Reversible hydro power plants are one of several technologies that allow to store energy, by pumping water from a lower reservoir to an upper reser...

This paper characterizes volcanic rocks through the application of an empirical geomechanical system designated as VRS (Volcanic Rock System). For the VRS, geotechnical information was collected from samples from several Atlantic Ocean islands that include Madeira and Canarias archipelagos, taking also into consideration data from other different s...

The stability of volcanic caves particularly in urban areas and in touristic places presents high complex problems due to their nature, existing environment and mainly because the danger that represents for people and buildings, but also for the safeguard of those caves as natural monuments. There are risk sources which might cause large damages, d...

Landslide disasters, one of the most destructive geo-hazards, often have serious consequences that range from economic losses to fatalities. Earthquakes, particularly those with strong ground motion, can trigger thousands of landslides in mountainous regions. The 2008 Wenchuan earthquake which occurred in China is such an example. The massive Dagua...

A key aspect that affect many deep underground mines over the world is the rockburst phenomenon, which can have a strong impact in terms of costs and lives. Accordingly, it is important their understanding in order to support decision makers when such events occur. One way to obtain a deeper and better understanding of the mechanisms of rockburst i...

A key aspect that affect many deep underground mines over the world is the rockburst phenomenon, which can have a strong impact in terms of costs and lives. Accordingly, it is important their un�derstanding in order to support decision makers when such events occur. One way to obtain a deeper and better understanding of the mechanisms of rockburst...

Landslides are one of the most vital natural hazards on Earth. To satisfy the demand for protection against landslides, it is necessary to systematically assess and manage landslide hazards and risk. Landslide mechanisms related to hydrology are analyzed with focus in the major risks, and formal risk assessment methodologies are presented in the pa...

Presentation at the Webinar of a landslide at Sichuan Province, China.

A new empiric system was developed for volcanic rocks, designated VRS. For the VRS system, geotechnical information was collected from samples from several Atlantic Ocean islands that include Madeira and Canarias archipelagos, taking also into consideration data from other different sources.

Deep underground excavations in mining and civil engineering are subjected to high in-situ stresses which can cause rockburst. Rockburst is an instantaneous release of a large amount of strain energy stored in rockmass that can lead to injuries, deaths, and damage to infrastructures. Many studies have been done regarding rockburst, however, there i...

Understanding the soft soil layer-tunnel seismic interaction in the multi-layered ground is an important issue for a safe seismic design. However, this issue remains unclear since most of the previous studies considered homogeneous grounds. In this regard, the paper aims at investigating the seismic behavior of tunnels when they intersect a soft so...

Soft Rock Mechanics and Engineering Discusses difficult ground conditions involving soft rocks from an interdisciplinary perspective; Describes the classification and properties of soft rock masses; Presents important case histories involving tunnelling, dam foundations, coal and open pit mines and landslides This book offers a practical reference...

Landslides are one of the most important natural hazards on Earth. 12 Landslide mechanisms related to hydrology are analyzed with focus in the major 13 risks, and formal risk assessment methodologies are presented. The management 14 of accidents in slopes is discussed, with particular emphasis to Hong Kong and 15 to Rio de Janeiro. Specific aspects...

Conventional rock sampling method such as diamond drilling may fail because of the disaggregation or expansion of rock cores of soft rock. Two new sampling systems have been developed for field sampling, processing and transportation. One system is developed by the State Key Laboratory of Geomechanics and Deep Underground Engineering of China Unive...

In recent years, the evaluation of geomechanical parameters in rock masses and particularly in soft rock masses has gone through significant improvements. New instruments and equipment for in situ and laboratory tests allow for a more accurate evaluation of the properties of soft rock masses. Advancements in data mining (DM) techniques allow for be...

The purpose of this chapter is to analyze the behavior of underground works associated to hydroelectric schemes when soft rocks formations are present. The work starts with a brief introduction to the different types of underground hydroelectric schemes with a reference to the specific works related to the hydraulic circuit, to the powerhouse compl...

The rock temperature in deep coal mine is high, which seriously affects the mine safety production and restraints the exploration of coal resources. The cooling system HEMS (High temperature Exchange Machinery System) was developed using mine water inrush as a cold energy. The system was successfully applied in many coal mines in Xuzhou Mining Grou...

High rock temperature in deep coal mine is a problem, which restraints the exploration of coal resources, we must reduce the temperature humidity at working face. The HEMS (High temperature heat Exchange Machinery System) were developed by using coal mine water as cold source. The system is applied in Jiahe colliery with moderate cold source in pha...

The rock temperature in deep coal mine is high, which seriously affects the mine safety production and restraints the exploration of coal resources. The cooling system HEMS (High temperature Exchange Machinery System) was developed using mine water inrush as a cold energy. The system was successfully applied in many coal mines in Xuzhou Mining Grou...

This presentation is related to two cases of underground laboratories in USA and China. The emphasis is given to rock mass characterization.

Underground engineering is characterized by complex, uncertainty geology and geomechanics, that presents challenges and require new techniques to dealt with. The presentation presents topic related to the use of AI and the application of Data Mining techniques.

Tunnel maintenance and management is an important issue. A KBS system was developed and applied to old railway tunnels in Portugal. Applications of Bayesian networks were applied to a scenario of water infiltration.

Rock burst failure found at deep excavations involves fracturing of the rock and ejecting of rock blocks of different sizes as a result of the static loading and dynamic unloading processes. Stress analysis in consideration of the static/dynamic state of the stresses has been a topic with great challenging in rock burst studies. The present researc...

Presentation of forts with Portuguese legacy in the Middle East. Rehabilitation of Jalali and Mirani forts.

The 2008 Wenchuan earthquake resulted in a large number of fatalities and caused significant economic losses. Thousands of landslides, many of which are very large, were triggered by the earthquake. A majority of catastrophic landslides were distributed along the central Longmenshan fault system, at the eastern margin of the Tibetan Plateau. Some o...

The presence of a soft soil layer can influence the propagation of incoming wave from the bedrock, undoubtedly modifying the ground motions and soil dynamic behavior. Despite its importance, the effect of an underlying soft soil layer on the seismic behavior of tunnels is not well known. In this paper, the analytical study, as well as numerical ana...

Landslides are one of the most important natural hazards on Earth. Landslide mechanisms related to hydrology are analyzed with focus in the major risks, and formal risk assessment methodologies are presented. The management of accidents in slopes is discussed, with particular emphasis to Hong Kong and to Rio de Janeiro. Specific aspects of slope in...

Report of activities in 2018-2019 at Tongji University, Shanghai, China.

to assess and manage the risks associated underground construction [7-10]. Most accidents in underground construction are associated with uncertainties. It is therefore essential to develop risk analysis systems. Historically, risk assessment and risk analysis have not assumed particular relevance when evaluating underground projects and other majo...

Flow-type landslides are an important hazard that can cause great destruction due to the rapid flow velocity and large disaster area. This paper presents a catastrophic flowslide that recently occurred at a landfill in Shenzhen, China. This disaster involved an area about 1100 m in length and 630 m in maximum width, and caused the death of 77 peopl...

Methodologies for preservation of ancient caves are presented. The presentation starts by a description pre-historic caves in Europe (cases of Altamira and Lascaux caves are analyzed). Problems concerning rock mass characterization are followed and case histories related to Rossio cave in Alvito (Portugal), volcanic cave in Ponta Delgada (Azores Is...

Acoustic emission (AE)/micro-seismicity (MS) signal obtained in laboratory or in-situ monitoring of the dynamic events is generally contaminated by various noises which result in strong spectral dispersion. Therefore, a precise locating of the main spectral components in conventional power/Fourier spectrum and deeper insights into the time dynamics...

With the increasing of mining activities in China, a series of hazards such as landslides, rockbursts, large deformations occur frequently. At present, the challenges for these hazards consist in finding appropriate countermeasures. They can be classified in three types: monitoring of landslide, rockburst control, and use of innovative mining techn...

The use of AI in deep underground engineering is presented. Applications to Venda Nova II hydroelectric scheme, a deep underground laboratory and to the occurrence of rockbursts are indicated in this presentation.

The present paper is related to the development of a cutting system based on water jet with directly injected abrasives (DIA-jet). DIA-jet intends to cut rock bolts during mining works. In order to optimize the design of the jet nozzle and the abrasive tank, computational fluid dynamics (CFD) were used to obtain the behavior of the liquid-solid two...

The paper introduces a Constant-Resistance-Large-Deformation (CRLD) bolt which has been developed at State Key Laboratory for Geomechanics and Deep Underground Engineering (GDUE), in Beijing. Advancements in Split-Hopkinson Tension Bar (SHTB) tests were recently developed for CRLD bolts and experimental test results for these bolts were obtained. F...

Presentation about the use of Data Mining techniques in Geomechanics.

Lecture about Open Pit Mines. Describes: - Assess the nature of open pit mines - Risk management - Updating risk - Monitoring in China - Case of Musandum .

This paper tries to characterize volcanic rocks through the development and application of an empirical geomechanical system. Geotechnical information was collected from the samples from several Atlantic Ocean islands including Madeira, Azores and Canarias archipelagos. An empirical rock classification system termed as the volcanic rock system (VRS...

Rockburst is an important phenomenon that has affected many deep underground mines around the world. An understanding of this phenomenon is relevant to the management of such events, which can lead to saving both costs and lives. Laboratory experiments are one way to obtain a deeper and better understanding of the mechanisms of rockburst. In a prev...

In works like roads, foundations and dams it is necessary to estimate the degree of slope stability in rock masses. This theme is evaluated from the points of views: Safety against a prescribed failure; Potentially instable slopes, that failed or need to be subjected to a new design; The concept related to the stability of a slope is undetermined;...

A description of the CRLD bolt will be presented with the emphasis to the associated concepts and working principles, as well in the constitutive model. • Static and dynamic tests developed for this type of bolt are presented. The emphasis of this presentation is addressed for the dynamic Hopkinson tests, with emphasis in the design of the specimen...

Storage of CO2 in deep onshore and offshore geological formations uses many of the technologies developed by oil and gas industry and has been proved to be economically feasible under specific conditions in oil and gas fields, and in conjunction with enhanced oil recovery (EOR) and enhanced gas recovery (EGR), and in saline aquifers (IPCC, 2005; EA...

Rockburst frequently occurs in deep underground excavations in a sudden or violent ejection of block rocks from excavation walls. In addition to understanding rockburst mechanisms, rockburst control is an important issue for the safety of mining operations. Bolts and anchors are efficient measures to control rockburst that permit an efficient explo...

The presentation is about Dunhuang caves in China. The caves started in Century IV and the Mogao and Yulin caves are described in detail.

The stability of slopes in open pit mines is an issue of great concern because of the significant detrimental consequences instabilities can have. To ensure the safe and continuous economic operation of these mines, it is necessary to systematically assess and manage slope stability risk. This however has not been traditionally easy due to the fact...

In underground works engineering rockburst is characterized by a violent explosion of a rock block causing a sudden rupture in the rock and is quite common at high depths and every year is responsible for many accidents worldwide. It is critical to understand the phenomenon of rockburst, focusing on the patterns of occurrence so these events can be...

The stability of volcanic cavities particularly in urban areas and in touristic places presents high complex problems due to their nature, existing environment and mainly because the danger that represents for people and buildings, but also for the safeguard of those cavities as natural monuments. There are risk sources which might cause large dama...

The stability of ancient cavities in historic areas presents high complex problems due to their nature, existing environment and valuable cultural heritage. There are risk sources which might cause large damages and deterioration and, in some cases, it is necessary to put forward conservation measures in order to prevent damage or destruction of th...

Rehabilitation of ancient masonry forts in the Middle East is analyzed, with focus in forts with Portuguese legacy. The protection works performed at Jalali Fort, in Muscat, Oman are presented, as well as the rehabilitation of Mirani Fort, Muscat, also in Oman.

Use of Data Mining techniques in Geo-Engineering. Applications to underground hydroelectric schemes in Portugal (Venda Nova II and Bemposta II). Nodels for DUSEL, USA. Models for prediction of rockburst indexes.

Tunnel construction is increasing worldwide in mining and civil engineering. There have been several accidents that resulted in delays, cost overruns, some with more severe consequences. To help minimize these accidents, it is necessary to assess and manage the risks associated with tunnel construction and exploration. A particular type of accident...

Rockburst is characterized by a violent explosion of a block causing a sudden rupture in the rock and is quite common in deep tunnels. It is critical to understand the phenomenon of rockburst, focusing on the patterns of occurrence so these events can be avoided and/or managed saving costs and possibly lives. The failure mechanism of rockburst need...