I Gde Budi Indrawan

• PhD
• Universitas Gadjah Mada

This paper presents the results of engineering geological mapping conducted in Section 5 of the Yogyakarta-Bawen toll road and tunnel construction area and its surroundings. This research aimed to evaluate the characteristics of the study area's geomor-phology, lithology, and geological structures to assess potential geological hazards during and a...

Bagong Dam, located in Trenggalek Regency, has a diversion tunnel. The diversion tunnel is designed as a horseshoe-type tunnel with a diameter of 4 m and a length of 416 m. Although a general engineering geological investigation has been conducted at the dam site, slope stability has yet to be analyzed. This research seeks to categorize rock masses...

The design plans for the 433-meter-long Diversion Tunnel in the BBWS Cidanau Ciujung Cidurian area, situated on the right side of the Pasir Kopo Dam in Lebak, Banten, involve the application of the Rock Mass rating (RMR) method for rock mass classification. This approach is also utilized to determine the excavation method for the tunnel, stand-up t...

With Samarinda serving as a key buffer to the capital city of Nusantara, which grapples with urbanization and congestion challenges, infrastructure development has become a critical focus, particularly the construction of the Sultan Alimuddin - Kakap Tunnel. Planned for Selili Village, this tunnel will be the first road tunnel in East Kalimantan an...

Rocks containing clay minerals can experience rock deformation when interacting with water, this can also caused by the argillic zone, in the underground tunnel at the Unfoloader 600 and Xc 600 loop 2 ciurug. The argillic process that causes actual material swelling that occurs in field causes rock mass around the mining development area to become...

This paper presents the results of borehole investigations and laboratory tests carried out to characterize the soils derived from in situ weathering of tuff in Central Java, Indonesia. The 70 m thick weathering profile of the Quaternary tuff consisted of residual soil and completely to highly decomposed rocks. The relatively low dry unit weight an...

Soil liquefaction is one of the collateral hazards of earthquakes which can cause a soil layer to lose its bearing capacity, which can affect the stability of structures. Failure of a building structure can cost many lives, especially in strategic buildings. This research discusses bored pile foundations from the planned construction of elevated ro...

The measurement of the discontinuity area is one of the important data to determine the slope failure kinematics. Discontinuity measurement can be done by geological compass measurements, but only limited to areas that can be reached and safe. Methods that can help measure the discontinuity plane is Structue from Motion techniques. This method uses...

Slope stability is a serious problem that academics are still looking into in terms of human safety, equipment, and structures along the slope. Failure on slopes happens for a variety of reasons, including rock physical and mechanical properties, discontinuity factors, slope geometry, and external variables like as rainfall and seismic activity. Th...

In shale oil/gas exploration, using the Brittleness Index to identify sweet spots has become standard. This practice may incur inaccuracies when done inappropriately. This work used basic statistics and scatterplot analyses to identify trends and performance of four brittleness indexes. In the results, the indexes seemed similar in the well-logs wi...

Bintang Bano Irrigation Area aims to optimize water consumption downstream of the Bintang Bano Dam and distribute it to irrigate agricultural land in Rempe, Seteluk, Seloto, and Senayan villages. Bintang Bano Irrigation Area uses tunnel construction as its network. This research aims to provide recommendations for the tunnel excavation method and s...

The construction of toll roads in earthquake-prone areas presents significant challenges due to the potential occurrence of liquefaction, a seismic phenomenon in fine-grained soils losing strength during earthquakes. The research was conducted at a toll road construction site in Sleman Regency, Yogyakarta, an area near the active Opak fault which i...

The Yogyakarta - Bawen Twin Tunnels emerge as an environmentally conscious solution for Toll Road Phase 5 (STA 6+300 to STA 27+640), addressing the ecological impact of open-cut excavation, which demands a staggering 1,209,056 m ³ . Open-cut excavation not only incurs substantial operational costs, encompassing disposal and treatment, but also pose...

The Matenggeng Dam is situated in Matenggeng village, Dayeuhluhur, Cilacap district, Central Java. It features a diversion channel equipped with a tunnel that has a diameter of five meters and is formed like a horseshoe. Therefore required engineering geological analysis for tunnel planning. The purpose of this study is to ascertain the tunneling t...

Ungaran Timur merupakan salah satu daerah rawan longsor di Kabupaten Semarang. Pusat Vulkanologi dan Mitigasi Bencana Geologi (2016) telah melakukan penelitian mengenai kerentanan gerakan massa pada Kota Salatiga dan Kabupaten Semarang, Provinsi Jawa Tengah dengan skala 1:250,000, namun diperlukan peta yang lebih rinci untuk mitigasi longsor di tin...

The Main Spillway and Diversion Tunnel at Manikin Dam is one of the dams under construction in the Kupang City area, where several soil or rock investigations have been carried out around it. However, the field investigations are not accompanied by a surface geological investigation or evaluation of subsurface geological conditions based on core dr...

River flow diversion is one of the most critical factors that must be considered for the success of dam construction. Soil and rock can support and load; therefore, understanding their strength and properties before tunnel construction is essential. Tunnel excavation and support depend totally on rock mass quality. Surface geological mapping, drill...

The Yogyakarta-Bawen toll road tunnel, located in Magelang Regency, Central Java Province, is a national strategic project that connects Central Java and the Special Region of Yogyakarta. It has geology resulting from volcanic processes, resulting in rocks with moderate aquifer properties and low to moderate permeability. The study covers 24 observ...

Determination of excavation technique was one of the essential factors in tunnel construction stability. It also had an impact on the efficiency of the construction phase. However, in the Detail Engineering Design of the Rukoh Dam Suppletion Tunnel, there was no study of the most optimal excavation technique in the construction phase. This study ai...

Geological and geotechnical assessments play a significant role in geotechnical work and slope stability analysis.This study aimed to assess the stability conditions of the proposed road cut along the Ayah-Jladri section, Kebumen, CentralJava, using parameters from the geological and geotechnical survey. The parameters were defined through geologic...

This paper presents the characterization of igneous rock masses for the design of tunnel excavation methods and support systems. The subject of this research is the Bintang Bano Irrigation Tunnel located in Sumbawa Barat, Nusa Tenggara Barat. This tunnel was built as a container to channel water potential from the Bintang Bano Dam to the surroundin...

Investigation of slope stability in the design of the tunnel portal is important to minimize slope failure. This research aims to describe the rock mass characterizations and classifications using Geological Strength Index (GSI) and Rock Mass Rating (RMR), along with the kinematic analysis and Slope Mass Rating (SMR) to define the risk of slope fai...

In the design of the Rukoh Dam Suppletion Tunnel, the rock mass quality had not yet been evaluated. Whereas the evaluation empirically affects the stability and support system of the tunnel. This research aimed to provide recommendations for excavation methods and support systems in tunnel construction based on the RMR and Q-System methodologies. T...

This paper presents the implementation of rock mass classification systems to determine the excavation method and the support design of the Spillway Tunnel, Sidan Dam, Bali, Indonesia. In order to mitigate the uncertainty associated with using single rock mass classification during designing tunnels, this study provides an evaluation by applying mu...

Budong-Budong Dam is located on Salulebo River, West Sulawesi Province, and has a diversion tunnel to divert river flow so as not to interfere with construction at the main dam. This diversion tunnel has a D shape which is dimensions 5 m. The Method used in empirically assessing rock mass quality is Rock Mass Rating (RMR) and Japan Society of Civil...

Site characteristics develop a better understanding of geological conditions to prevent tunnel failure. Tunnel 2 Bintang Bano Irrigation Area in Seloto, West Sumbawa, West Nusa Tenggara Province, was designed with different interpretations of geological conditions that could lead to inaccuracy of the tunnel design. This paper aims to identify the c...

The location of the Sidan Spillway Tunnel, as shown on the Earthquake Hazard Zone Map of Bali Island, is in a moderate hazard zone. The support system of the spillway tunnel of the Sidan Dam, Indonesia, was empirically designed based on rock mass classification systems. The objective of this research was to verify the performance of the proposed su...

The Rukoh Dam suppletion tunnel construction site in Pidie Regency, Aceh province, is located 5.6 kilometers from the Seulimeum-South segment of the active Sumatran fault. The active fault features a strike-slip fault mechanism with a slip rate of 7.0 millimeters per year and a maximum earthquake-recorded magnitude of 6.9 Mw. Considering that the c...

The Saka Dam has a channel in the form of a diversion tunnel. This paper presents the results of rock mass characterization using the Geological Strength Index (GSI) classification and evaluation of the stability of the tunnel portal slope with earthquake loads using numerical methods. Based on the GSI classification, the Saka Dam tunnel portal slo...

This paper presents the research results carried out to analyze the slope stability of the diversion tunnel portal of Jlantah Dam based on the quality of the rock mass. The classification of the rock mass quality at the tunnel location refers to the Geological Strength Index (GSI) method while the analysis of portal slope stability is modelled nume...

The problem of portal slope instability often occurs caused by the poor lithological conditions composing the slope. During the portal excavation of the outlet spillway tunnel in the Bulango Ulu Dam, the slope failed. The slope was then reinforced by consolidation grouting. The objectives of this research were to characterize the soil and rock mass...

The difference in geological and geotechnical conditions during design and implementation are frequent due to the lack of data collection and diverse rock variations. An important step in designing the excavation method, stages, and support system are determining the rock mass’s actual condition. Inaccuracy in evaluating rock mass quality can cause...

This work implements a well-logging approach to evaluate the rock Elastic Parameters, basic Rock Mechanics, and in-situ Stresses in an interval of the Well Poseidon 1 located in the offshore Browse Basin in the Timur Sea of Australia. For this aim, there were used several correlations for the Young’s Modulus, Uniaxial Compressive Strength; one form...

Determination of excavation technique was one of the essential factors in tunnel construction stability. It also had an impact on the efficiency of the construction phase. However, in the Detail Engineering Design of the Rukoh Dam Suppletion Tunnel, there was no study of the most optimal excavation technique in the construction phase. This study ai...

The research area was located in the west pit of the open pit coal mine of PT. Tawabu Mineral Resource (TMR) which is located in Bengalon District, East Kutai Regency, East Kalimantan Province, Indonesia. The research was driven by several landslides that occurred in the research area, but the engineering geological conditions and stability of the...

The construction of Jalur Jalan Lintas Selatan (JJLS) infrastructure is implied to facilitate access and increase the potential for agriculture and tourism in the South Coast Region of Java. Slope stability evaluation should be done in this development infrastructure area to build sustainable and resilient infrastructure. However, no studies have b...

The Planjan - Tepus road is built on a slightly steep karst morphology, necessitating slope excavation works. Slope stability is one of the elements to consider, particularly in slope excavation work. The excavation depth of the slopes sampled in this research is up to 48 meters. It is critical to undertake slope stability analysis quickly, precise...

Tepus-Jerukwudel Road construction is one of the South Coast Java Road sections located in Gunungkidul Regency, Special Region of Yogyakarta. One of the hills with the deepest excavation depth is at STA 14+350. The research location includes the Punung Formation which is dominated by reef limestones. The existing rock lithology is floatstone. The d...

p>Leakage or seepage in reservoirs and dams has the potential for structural instabilities persuaded by water leakage pathways and linked to economic consequences. An environmental isotopic and hydrochemical research was conducted to determine the source and origin of seepages on the tunnel of Pandanduri dam, Lombok Island, Indonesia. This study ai...

Mining operations in areas with the potential for landslides require careful analysis of the risks that will occur so that the consequences of losses can be anticipated early with the approach to predicting the volume of landslide material. This study aims to evaluate and predict materials that are at risk of slope failures on the slopes of the PT....

A mining activity generally removes overburden to extract minerals. Therefore, a certain area is needed to place the overburden material. One of the parameters that can affect the stability of the disposal is the base or the foundation of the disposal area which will later be stockpiled. This study is observe influence of base disposal to the stabi...

The excavated slope of the diversion tunnel outlet at the Leuwikeris Dam was designed based on core test data and the Circular Failure Chart (CFC) method. Stability of the excavated slope under static and seismic loads has not been verified using a different method. The objective of this research was to evaluate performance of the excavated slope u...

The construction of Meninting Dam is undertaken to resolve the water needs in Meninting Watershed, West Lombok, Province of West Nusa Tenggara, Indonesia. Therefore, creating a diversion tunnel is imperative to avert the river flow as the dam project commences. Also, engineering geology work on the soil and rocks, including the classification of ph...

Construction of the Lau Simeme Dam used a tunnel as a diversion channel. Slopes at the diversion tunnel portals were prone to failure due to the tunnel excavation and earthquake. Earthquake load was not considered in the designs of the inlet and outlet portal slopes. This research evaluated stability of the tunnel portal slopes under static and ear...

Tunnel 6 of the Jakarta-Bandung high-speed railway is the longest mountain tunnel in Indonesia. This study aimed to evaluate the behaviour of rock masses surrounding the tunnel and support system by conducting surface and subsurface engineering geological investigations. The rock masses at the tunnel construction area were classified based on the R...

This study aimed to propose alternative support systems for a diversion tunnel at the Narogong Weir, West Java, based on the Rock Mass Rating (RMR), Tunnelling Quality Index (Q), and Japanese Rock Mass Classification systems. Surface geological mapping, drill core evaluation, and laboratory testing were conducted to characterize the engineering geo...

Latar belakang: Tambang batubara di Indonesia secara umum menggunakan metode tambang terbuka pada tahap eksploitasi. Tujuan penelitian: Penelitian ini bertujuan untuk mengetahui tingkat kestabilan lereng di daerah penelitian berdasarkan metode klasifikasi massa batuan RMR dan GSI, menentukan tingkat kestabilan desain lereng berdasarkan metode keset...

The earth-fill and rock-fill dam are designed to be used for long-term storage, hydropower, flood control structure. The dam is set to design against failure due to various causes that can result in releasing the water catastrophically to the downstream area as a flood hazard. The consequences of the dam's failure can damage the downstream area inf...

Located in the Takalar Regency of South Sulawesi Province, the Pamukkulu Dam is planned to use a tunnel type as its diversion structure. One of the critical parts in the tunnel construction is the stability of portal slopes. This research aimed to estimate the effect of tunnel excavation on the stability of the portal inlet and outlet slopes under...

Several attraction places and agriculture area that essentials for tourism and villager to do their activities are located approximately 6 km along the road of Candi Ijo to Ngoro-Oro in between Prambanan and Patuk sub-districts, Yogyakarta, Indonesia. Many jointed rock masses along the road have the potential to fail. This paper describes the rock...

Assessment of rock mass quality was conducted to estimate the stability of Donan Cave. This research involved geological mapping, cave geometry mapping, rock mass quality zoning by scanline survey based on the Q-system rock mass classification, and cave stability estimation based on the rock mass quality, ratio of cave roof thickness to width, and...

After operated more than 20 years, Piyungan landfill has already in full capacity because it has exceeded its technical age. Constrained by the difficulty of finding new land, the government, eventually, determined the development of new landfill in the area of ±1.9 Ha near Piyungan landfill. This research aims to determine whether planned area is...

The process of weathering rocks in tropical regions like Indonesia is a challenge in engineering geology because in the tropics weathering on a rock it will be faster due to dense vegetation, climate, and high rainfall. In engineering geology, the weathering process becomes a very important issue especially in the field of slope stability due to th...

A dam is a construction built to hold the flow of water and creating a reservoir, one of which is the Tukul dam, administratively located in Karanggede Village, Arjosari District, Pacitan Regency, East Java Province. Morphologically, the study area consists of hills that are flanked by steep valleys, the Brungkah watershed, with slope classified as...

The aim of this study is to evaluate the stability of the natural and designed cut slopes of the tunnel inlet and outlet portals at the Jragung Dam site, Semarang, Central Java, Indonesia, under static and earthquake loads using the finite element method. Input parameters used for the numerical slope stability analyses were obtain from surface and...

A highway is planned to be constructed in the Southern Mountains of East Java, along Serang Beach – Malang Regency. As it is located on the mountainous terrain, cut and fill works will be required to satisfy the design criteria of highway alignment, and stability of the designed cut slopes will be an important issue. This paper presents the results...

Tunnel 3 of the Sigli Banda Aceh Toll Road has been designed based on several site investigations. The site investigations have not included surface geological investigations. Subsurface geological investigations have been carried out but with less detailed drill core evaluation. This will cause less accuracy on the assessed tunnel stand-up time. T...

This paper presents engineering geological investigation results in the form of rock mass characteristics for tunnel number 1 of the Sigli-Aceh toll road. The investigation was carried out through geological mapping, core drill evaluation, and laboratory tests. In this research, the rock mass rating (RMR) and Geological Strength Index (GSI) were ap...

The Gedangsari and Ngawen area is predominantly composed of volcanic and volcaniclastic sequencesdistributed east – west direction of the northern parts of Southern Mountain. The massive tectonism as well as tropical climatein this region have been producing weathering profiles in varying thickness which inevitably affects thegeotechnical propertie...

The calculation of coal reserves is influenced by the dimensions or size of the coal deposit. There are several types of coal reserve calculation methods, and the use of these methods is adjusted to existing geological conditions. Each method will produce a different amount of coal reserves, although the location is the same. Besides, the amount of...

The safety of the employees is essential in the mining activity area. Thus, the sloping wall of the pit needs to evaluate from time to time to avoid any loss due to landslide. One of the essential parameters to lead to slope failure is groundwater. Therefore, this paper highlights the limitations of the groundwater for the existing slope mine by an...

This study is performed to investigate the characteristics of intrusive andesite rock consisting of Kalirejo Road Side Slope located in Kulon Progo Mountains. The rocks consisting the slope are identified by visual observation of hand specimens in the field, petrographic and X-ray Diffraction (XRD) analyses of the rock samples in the laboratory, up...

This paper presents experiences with design and construction process of the Tanju Tunnel, West Nusa Tenggara. The objective of this research was to characterize the volcanic and intrusive rock masses for designs of the tunnel excavation method and support system. Engineering geological investigations were carried out, upon which the tunnel stand-up...

An engineering geological mapping was carried out at the construction site of the Tunnel 10 of Jakarta Bandung High-Speed Railway to obtain data and information of the engineering geological conditions, particularly the rock masses. This research aims to determine the rock mass classes at the tunnel construction site and recommend the tunnel suppor...

The empirical design of tunnel 7 of the Jakarta-Bandung high-speed railway was based on the Basic Quality (BQ) system, which was the Chinese standard of rock mass classification. Due to the high uncertainty of a rock mass classification, comparative studies of rock mass quality and tunnel support systems based on other rock mass classifications are...

This paper presents the results of a geological engineering investigation in the form of rock mass characterization at the Jlantah Dam Intake Tunnel. The study was carried out through technical geological mapping, core drill evaluation and supported by laboratory test data. The determination of rock mass classification at the research site has been...

This paper presents the results of geological engineering research conducted to determine the character of rock masses, recommendations of tunnel excavation method and support system based on standup time estimates in unsuported conditions. The investigation was conducted by observing rock mass quality based on the newest bore log sample test resul...