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All Journal Jurnal RISET Geologi dan Pertambangan Journal of Degraded and Mining Lands Management JGE (Jurnal Geofisika Eksplorasi) Jurnal Wilayah dan Lingkungan Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Jurnal Mineral, Energi dan Lingkungan Jurnal Mineral, Energi dan Lingkungan APPLIED RESEARCH ON CIVIL ENGINEERING AND ENVIRONMENT (ARCEE) Jurnal Sosial dan Teknologi Action Research Literate (ARL) Journal of Applied Geology Jurnal Jalan Jembatan
I Gde Budi Indrawan
Departemen Teknik Geologi, Fakultas Teknik, Universitas Gadjah Mada, Jl. Grafika No. 2, Senolowo, Sinduadi, Mlati, Sleman, D.I. Yogyakarta 55284, Indonesia.
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Stability Analysis of Saka DAM Diversion Tunnel Portal Febrie Maulana Fajrin; Subagyo Pramumijoyo; I Gde Budi Indrawan
Journal of Applied Geology Vol 8, No 1 (2023)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.57578

Abstract

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 slope is composed of rock masses that are poor quality, fair, and good. The calculation results show the Saka Dam can experience earthquake loads with an acceleration value of 0.4g. Earthquake loads can cause a decrease in the safety value (SRF) of the tunnel portal slope based on the results of numerical analysis. SRF value of natural portal slope without earthquake effect is 10.23 (inlet) and 1.5 (outlet). SRF value of the design slope portal without earthquake effect is 6.64 (inlet) and 1.76 (outlet), whereas if the earthquake effect is taken into account the SRF value obtained is 20.31 (inlet) and 0.99 (outlet). This shows that the condition of the natural portal slope and the portal slope design planner section of the Saka Dam inlet diversion tunnel is in the safe category. Meanwhile, for the portal slope excavated from the outlet section, modification is needed to obtain a safe slope condition. The results of the modified geometry of the slopes at the outlet section resulted in an SRF value of 1.47 which indicates the slope is stable 
Evaluation of Engineering Geological Conditions for Slope Stability Analysis of Diversion Tunnel Portal of Jlantah Dam, Karanganyar, Central Java Yayi Ismanda; I Gde Budi Indrawan; Heru Hendrayana
Journal of Applied Geology Vol 8, No 1 (2023)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.72438

Abstract

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 numerically with the element method using Phase2 software. The modelling of the tunnel portal slope design with and without earthquake load was carried out to obtain the safety factor (SF) value. The results showed that the study area consists of residual soil, andesite breccia and lapilli tuff rocks with rock mass quality based on the GSI value ranging from poor to fair. The inlet portal slope is composed of rocks that have poor and fair mass quality while the inlet section is composed of rocks that have poor mass quality. The SF value>1.3 for conditions without earthquake effect was achieved on slope design 1V:1.5H and SF value>1.1 for conditions with earthquake effect was achieved on slope design 1V:2H. The SRF value at the portal outlet location is greater than the SRF value at the portal inlet location for the same slope design conditions indicating that the rock mass quality at the portal outlet location is better than the rock mass quality at the portal inlet location.
EVALUASI NUMERIK METODE PENGGALIAN TEROWONGAN CISUMDAWU I Gde Budi Indrawan; Ridwan Umbara; Fahmi Aldiamar
Jurnal Jalan-Jembatan Vol 36 No 1 (2019)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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Abstract

This paper presents results of research works carried out to evaluate the excavation method of the left (west) side of the Cisumdawu Tunnel by a numerical method. Using data obtained from site investigation during design process and face mapping at eight observation points, tunnel excavations by bench cut (multiple), full face with bench cut, and centre diaphragm methods were numerically modelled in two dimension using a finite element method. The numerical modelling results were compared with field measurement results to determine the most suitable excavation method applied in Cisumdawu Tunnel. Results of this research showed that roof displacements induced by the bench cut (multiple) excavation method obtained in the numerical modelling was close to that obtained in the field measurement. The bench cut (multiple) excavation method applied in the field induced lower roof displacement value than the full face with bench cut and centre diaphragm methods. However, the three excavation methods induced roof displacements lower than a 10 cm maximum displacement specified in the JSCE (2007) and roof strength factor > 1.25, indicating stable tunnel condition.
KARAKTERISASI MASSA BATUAN DAN EVALUASI KESTABILAN LERENG DENGAN METODE NUMERIK PADA RUAS JALAN PLANJAN–BARON–TEPUS Tri Puji Astuti; I Gde Budi Indrawan; Didit Hadi Barianto
Jurnal Jalan-Jembatan Vol 39 No 2 (2022)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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Abstract

This research aims to evaluate the stability of the slope by considering the rock mass characterization. The research location was conducted on the Planjan–Baron–Tepus section at STA 7+000 to STA 9+725, with limestones dominating the lithology. The data collection method begins with determining rock mass quality based on rock mass classification using the Geological Strength Index (GSI) of limestone introduced by Marinos (2010). The results of testing the physical and mechanical properties of rocks and the quality of rock mass will be used as input parameters in the slope stability analysis. The results showed that the rock mass quality in the research area varied from "good" condition at STA 9+075, "fair" condition at STA 7+825, to "poor" condition at STA 8+475. Based on the slope stability analysis using the finite element method and the Generalized Hoek-Brown failure criteria, the result of the slope analysis at three locations representing the rock mass quality was a stable (safe) condition without seismic loads and with seismic loads. Key words: slope stability, rock mass quality, geological strength index, limestone, finite element method.
Analisis Kestabilan Lereng Tambang Terbuka Blok A Sisi Timur Daerah Tanjung Lalang, Kecamatan Tanjung Agung, Kabupaten Muara Enim, Sumatera Selatan Baniarga Prabowo; Hendy Setiawan; I Gde Budi Indrawan
Jurnal Sosial Teknologi Vol. 2 No. 1 (2022): Jurnal Sosial dan Teknologi
Publisher : CV. Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/jurnalsostech.v2i1.289

Abstract

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 kesetimbangan batas dan memberikan rekomendasi optimasi geometri desain lereng di daerah penelitian berdasarkan potensi keruntuhan dan nilai FK yang dihasilkan. Metode penelitian: Pada tahap penelitian ini peneliti melakukan pengumpulan data yang berasal dari data primer dan data sekunder. Data primer yang digunakan sebagai pedoman peneliti adalah data geologi dan geoteknik daerah penelitian. Hasil penelitian: Berdasarkan klasifikasi massa batuan RMR dari data lima titik pemboran, didapatkan hasil bahwa batuan di lokasi penelitian termasuk dalam kategori II-III yaitu good rock – fair rock. Nilai GSI di daerah penelitian dikategorikan termasuk dalam intact rock – very blocky. Parameter geoteknik didapatkan dengan menggunakan metode back analysis dengan menggunakan pendekatan Generalized Hoek-Brown didapatkan UCS 1000 kPa, m 0,192161 , s 7,91279.e-5, a 0,561101. Berdasarkan analisis kinematika terhadap kelongsoran yang dapat terjadi didapatkan hasil bahwa terdapat potensi Wedge Sliding 6,65 % dan Toppling Sliding 3,13% . Kesimpulan: Hasil dari empat log bor menunjukkan bahwa Rock Mass Rating (RMR) daerah tersebut didominasi kategori II (dua) dengan interpretasi batuan baik dengan nilai perhitungan >60. Kondisi lereng saat penelitian dilakukan telah mengalami keruntuhan dan sebelum terjadi keruntuhan diasumsikan lereng labil. Mitigasi kestabilan lereng tambang terbuka dilakukan dengan cara membuat desain ulang lereng yang memiliki nilai faktor keamanan >1,25.
Landslide susceptibility mapping in East Ungaran, Indonesia: A comparative study using statistical methods Maulana, Deviana Shinta; Indrawan, I Gde Budi; Warmada, I Wayan
Journal of Degraded and Mining Lands Management Vol. 11 No. 4 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.114.6107

Abstract

East Ungaran, is one of landslide prone areas in Semarang Regency, Indonesia. In addition to provide a more detail map of landslide susceptibility, the objective of this research was to compare performance of three widely used methods, which are the Weight of Evidence (WoE), Logistic Regression (LR) and combined Weight of Evidence (WoE) – Logistic Regression (LR), for landslide susceptibility mapping. Slope, elevation, lithology, land use, normalized difference vegetation index (NDVI), distance from lineament, distance from river, and distance from road were considered as landslide controlling parameters in the research area and were used as input variables in the landslide susceptibility zonation. The results showed that the slope, elevation, and distance from the road are significant parameters causing the landslides. The research area is divided into very low, low, moderate, and high landslide susceptibility zones. The WoE performs better than the LR, while the combined WoE-LR method performs the best among the three methods in predicting landslide susceptibility in this area. The landslide susceptibility map developed using the combined WoE-LR method is suggested to be used for landslide mitigation planning of this area.
Comparison of stability analysis methods for safe design of volcanic rock slope Indrawan, I Gde Budi; Sunardi; Murti, Ardian Baroto; Alfrianto, Rifki
Journal of Degraded and Mining Lands Management Vol. 12 No. 1 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.121.6651

Abstract

The performance of the stability chart (SC), limit equilibrium (LE), and finite element (FE) methods for stability analysis of weathered volcanic rock slopes under static and earthquake loads is not fully understood. This research aimed to evaluate the performance of the SC, LE, and FE methods for slope stability analyses by studying a case of a weathered volcanic rock slope at the Leuwikeris Dam diversion tunnel in Indonesia. Site characterisations were carried out to obtain the input parameters for the static and pseudostatic slope stability analyses. The results showed that using various search methods of failure surface and the suggested optimum number of finite elements, multiple non-circular failure surfaces were predicted from the LE and FE methods that were not anticipated in the initial slope design based on the SC method. The location and shape of the failure surfaces from the LE method agreed with those from the FE method. The difference between the Fs values from the static LE analysis and those from the static FE analyses was less than 14%, but the discrepancy increased up to 78% in the pseudostatic analyses. This study highlights the importance of validating the results from one method with the other methods to prevent slope failures.
Geological Investigation of Clay Minerals (Swelling) Pt. Upb Antam Pongkor Bogor, West Java, Indonesia Gevor, Even; Indrawan, I Gde Budi; Warmada, I Wayan
Journal of Applied Geology Vol 9, No 1 (2024)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.97600

Abstract

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 weak. The location from tunnel cross cut of Unfoloader 600 and Xc 600 loop 2 contain active clay minerals which high percentage composition of swelling mineral material. The Unfoloader 600 location has a mineral swelling composition of 102.94% with 24 hours, justifying potential very high swelling. The minerals present based on XRD testing 70.8% illite, 25.4% kaolinite, 25.4% kaolinite and 3.8% montmorillonite. Location Xc 600 loop 2 has a mineral swelling composition of 131.25% with 24 hours, justifying potential for very high swelling. The minerals present based on XRD testing illite 49.7%, kaolinite 28.7%, quartz 20.3%, and montmorillonite 1.2%. The values obtained based on laboratory form free swelling tests and XRD that the location experienced of rock deformation, it’s swelling in the mining development area.
Engineering Geological Characteristics of Construction Area of Section 5 Yogyakarta-Bawen Toll Road, Magelang, Indonesia Abrar, Mifthahul; Tamado, Daniel; Indrawan, I Gde Budi
Journal of Applied Geology Vol 9, No 2 (2024)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.95271

Abstract

This paper presents the results of engineering geological mapping conducted in Losari (Central Java), where the Section 5 of the Yogyakarta-Bawen toll road and tunnel will be constructed. This research aimed to evaluate the characteristics of the geomorphology, lithology, and geological structure for assessment of potential geological hazards during and after the toll road and tunnel constructions. This research was conducted by collecting geomorphological and geological data by surface mapping and surface rock engineering properties by laboratory testing, which were not done in the previous site investigation. The surface mapping results show that the study area is at the geomorphological units of steep and gentle slope volcanic hills. The study area consists dominantly of tuff and tuff breccia units. At the surface, the rocks are extremely weathered. The geological structures controlling the study area are extension joints with northwest-southeast and northeast-southwest orientation, consistent with the morphological alignment. Although the study area consists dominantly of hilly morphology and extremely weathered rocks, landslides are rarely observed. This may be attributed to the land use and relatively high friction angle of the soils resulted from weathering of pyroclastic rocks comprising this area. The soils may, however, be susceptible to remoulding. Therefore, cut slopes made for road and tunnel constructions are suggested to be designed to prevent change in the soil state.
Excavation Method of Rock Masses at the Matenggeng Dam, Indonesia Afandi, Valentino Ilham; Indrawan, I Gde Budi; Husein, Salahuddin
Journal of Applied Geology Vol 10, No 1 (2025)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.103735

Abstract

This paper presents the results of engineering geological investigations and determination of rock mass excavation methods in the main dam area of Matenggeng Dam. The study was carried out through engineering geological mapping, core drill evaluation and supported by laboratory test data. Classifications of rock masses were carried out based on the Geological Strength Index (GSI) and Rock Mass Rating (RMR) to analyze the excavation method. The results showed research area consisted of lithology in the form of andesite, intercalation sandstone - gravelly sandstone unit, intercalation sandstone - siltstone unit, and alluvium deposits. However, at the main dam area consists of lithology in the form of intercalation sandstone-siltstone unit and intercalation sandstone-gravelly sandstone unit. The rock masses at the main dam excavation line have a weathering degree from moderately to complately weathered. Intact rocks have Uniaxial Compressive Strength (UCS) values ranging from 1-50 Mpa and are a category of extremly weak to moderate rocks. The rock mass of intercalation sandstone-siltstone with very poor to poor quality (GSI (0 - 58), RMR (8 - 45)), and intercalation sandstone-gravelly sandstone with poor to fair quality (GSI (20 - 59), RMR (20 - 68)). The recommended rock excavation method based on the EXCASS System is diggir, easy ripper, and hard ripper.
Co-Authors Abd Karim, Amirul Aiman Abrar, Mifthahul Adriansyah, Yan Afandi, Valentino Ilham Aisyah Shahirah Juhari Alfrianto, Rifki Alvian Rizky Yanuardian Amirul Aiman Abd Karim Anastasia Dewi Titisari Aprilia, Faridha Ardian Baroto Murti Aung, Hnin Thazin Baniarga Prabowo Daniel Happy Putra Daru Jaka Sasangka Dian Insani Dian Rusmanawati Didit Hadi Barianto Diyan Aditya Putra Pratama Diyaning Ratri Doni Prakasa Eka Putra Dwi Agus Kuncoro Dwikorita Karnawati Fahmi Aldiamar Fahmi Aldiamar, Fahmi Faridha Aprilia Fathan Hanifi Mada Mahendra Fatkhiandari, Irien Akinina Febrie Maulana Fajrin Gevor, Even Gusti Imam Warman Hendy Setiawan Heru Hendrayana Hitznaiti Zaidini' Khul Husna Hnin Thandar Phyu Hnin Thazin Aung Husein, Salahuddin I Wayan Warmada Ikfi Maasyi Hanif Ilham Dharmawan Putra Irien Akinina Fatkhiandari Jutika Aditya Nugraha Nugraha Kamai, Toshitaka Kuncoro, Dwi Agus Mahendra, Fathan Hanifi Mada Maulana, Deviana Shinta Murti, Ardian Baroto Nugraha, Jutika Aditya Nugraha Nugroho Imam Setiawan Nurul Huda Phyu, Hnin Thandar Putra Pratama, Diyan Aditya Rama Tri Saksono Ratri, Diyaning Ridwan Umbara Salam Via Febriyanti Sao Sochan Shinta Dwi Novianti Shinta Maulana, Deviana Sia Pamela Dita Sochan, Sao Subagyo Pramumijoyo Sugeng Sapto Surjono Sunardi Sunardi Sunardi Sunarko Sunarko Sunarko Sunarko Tamado, Daniel Taufiq Muhammad Wijayanto Tee Xiong Thandar Phyu, Hnin Toshitaka Kamai Tri Puji Astuti Tri Puji Astuti Umbara, Ridwan Wahyu Wilopo Wakhid Khoiron Nugroho Warman, Gusti Imam Wawan Budianta Wijayanto, Taufiq Muhammad Wisnu Aji Dwi Kristanto Xiong, Tee Yan Adriansyah Yayi Ismanda Yunie Wiyasri