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PENILAIAN PERBANDINGAN KESTABILAN LERENG BATUAN MENGGUNAKAN GENERALIZED ANISOTROPIC DAN JOINT NETWORK Akbar, Wahyu Nusantara; Barlian Dwinagara; Singgih Saptono; Dahono Haryanto; Shofa Rijalul Haq; Bagus Wiyono; Oktarian Wisnu Lusantono
Indonesian Mining Journal Vol 28 No 1 (2025): Indoneisan Mining Journal, April 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No1.2025.1548

Abstract

Rock slope stability analysis in a geotechnical study is an important issue in mining engineering. Kinematic analysis is a well-known method to determine potential failures of the rock slope based on structural orientations, but it sometimes disregards the structural properties information. Structural properties are often known as the highly interpreted domains in rock slope engineering; thus, simplification was made for the analysis. Simplification may lead to vague conditions of analysis and reduce its accuracy. Therefore, the aims of this research is to assess the effect of rock structure properties such as heterogeneity, discontinuity, and anisotropic properties of the rock mass. The assessment conducted using the limit-equilibrium method employed the Generalized Anisotropic (GA) material model were compared with finite element method (FEM) using the shear strength reduction (SSR) method employing the joint network rock mass model. The analysis results show that an actual rock slope with a generalized anisotropic material model in the LEM analysis and joint network material model in the FEM analysis is stable with Safety Factor > 1, and the maximum strain model is less than the minimum strain threshold (maximum strain < 0.1). Combining rock slope stability analysis methods aims to produce accurate and representative results regarding the rock mass' condition. This research improves the interpretation of rock slope stability analyses, resulting in a more accurate estimation of the factor of safety (FOS).
ANALISIS PENGARUH MASSA BAHAN PELEDAK TERHADAP GROUND VIBRATION UNTUK MENDAPATKAN PPV ≤ 3MM/S PADA JARAK 300M PIT INUL MIDDLE 3B, PT KALTIM PRIMA COAL, KABUPATEN KUTAI TIMUR, PROVINSI KALIMANTAN TIMUR Ilyasa, Muhammad Wildan; Saptono, Singgih; Siwidiani, Indri Lesta; Titisariwati, Indun; Ratminah, Wawong Dwi
Jurnal Teknologi Pertambangan Vol. 9 No. 2 (2024): Januari 2024
Publisher : Universitas Pembangunan Nasional Veteran Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jtp.v9i2.11876

Abstract

PT. Kaltim Prima Coal (PT. KPC) merupakan perusahaan yang bergerak di bidang pertambangan batubara yang terletak di Kecamatan Sangatta, Kabupaten Kutai Timur, Provinsi Kalimantan Timur. Salah satu pit yaitu Pit Inul Middle Panel 3B memiliki batas pit yang berjarak ±300m dari rumah penduduk. Pembongkaran dilakukan dengan melakukan kegiatan peledakan pada lapisan penutup. Salah satu efek dari kegiatan peledakan adalah dapat menimbulkan getaran tanah. Getaran tanah yang berlebih dapat menimbulkan kerusakan pada struktur bangunan. Menurut SNI 7571:2010 getaran tanah yang dapat merusak jenis bangunan kelas dua adalah Peak Particle Velocity (PPV) dengan nilai 3mm/s. Pada 9 April 2022 terdapat dua peledakan dengan PPV lebih dari ambang batas yang diukur pada rumah penduduk yang berjarak ±300m dari lokasi peledakan dengan nilai 3,33mm/s dan 3,101mm/s. Adanya hasil PPV tersebut dapat merusak struktur bangunan sehingga perlu dilakukan analisis untuk menanggulangi dampak yang ditimbulkan. Analisis dilakukan dengan menghubungkan nilai PPV dengan massa isian bahan peledak dan jarak pengukuran. Berdasarkan analisis massa isian bahan peledak dan jarak pengukuran berpengaruh pada nilai PPV. Terdapat dua usulan pengurangan massa isian bahan peledak dari 20 kg menjadi 19kg (Berta, 1985) dan 17kg (USBM,1962 dan Agrawal & Mishra,2018) pada jarak 300m. Usulan tersebut diprediksi memiliki crushing zone sebesar 9,969m (Kanchibotla et al,1999) dengan kerusakan batuan Strong tensile and some radial cracking of rock (Bauer dan Calder, 1978).
CONVERGENCE MONITORING UNTUK PREVENTIVE SUPPORT MAINTENANCE BERDASARKAN NILAI POTENTIAL DISPLACEMENT PADA AREA CONVEYOR DEEP MILL LEVEL ZONE, PT FREEPORT INDONESIA Larasingati, Margaret Aubrey; Wiyono, Bagus; Saptono, Singgih; Linggasari, Shenny; Rianto, Doli Jumat
Jurnal Teknologi Pertambangan Vol. 9 No. 2 (2024): Januari 2024
Publisher : Universitas Pembangunan Nasional Veteran Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jtp.v9i2.11877

Abstract

Area conveyor drift tambang bawah tanah DMLZ sangatlah penting dan kritis untuk kegiatan transportasi bijih, sehingga diperlukan pemantauan dan perawatan drift. Tambang bawah tanah yang semakin dalam dapat mengakibatkan penggalian bawah tanah menjadi lebih rentan terhadap kerusakan dan desain tambang menjadi lebih rapuh. Pendekatan desain ground support berdasarkan potensi deformasi ketika terjadi displacement akibat adanya tekanan perlu dilakukan karena saat ground support mengalami deformasi, masing-masing kapasitas ground support berkurang secara bertahap menjadi nol. Pendekatan tersebut dapat dikembangkan dengan implementasi Preventive Support Maintenance (PSM), dimana pemasangan tambahan ground support dilakukan sebelum area tersebut membutuhkan rehabilitasi. Penelitian dilakukan dengan pengambilan data displacement yang terjadi di tiap stasiun sepanjang area drift conveyor DMLZ menggunakan alat ukur konvergen. Data displacement kemudian diolah dan dianalisis untuk mendapatkan nilai cumulative displacement dan incremental velocity, sehingga dapat membuat klasifikasi PSM berdasarkan nilai potensi displacement dan kapasitas ground support yang telah terpasang di area tersebut. Hasil penelitian menunjukkan bahwa data pengukuran dari bulan Mei 2022 sampai dengan April 2023 tidak terjadi displacement yang signifikan. Pengaruh displacement yang terjadi sepanjang area drift conveyor DMLZ sampai saat ini belum menimbulkan kerusakan yang tampak secara visual, namun kegiatan pemantauan tetap perlu dilakukan secara berkala. Klasifikasi PSM telah dibuat berdasarkan potensi displacement, dimana action plan yang disarankan untuk PSM yaitu pemasangan ground support berupa MDX bolt sepanjang 3 m dengan spasi 1,1 m.
Pengaruh Diskontinuitas Terhadap Kestabilan Lereng Batuan Terkekarkan Studi Kasus Kuari Andesit PT Lola Laut Timur Kabupaten Bogor Irwan, Andesta Granitio; Koesnaryo, S.; Dwinagara, Barlian; Saptono, Singgih
PROMINE Vol 9 No 2 (2021): PROMINE
Publisher : Program Studi Teknik Pertambangan, Fakultas Sains dan Teknik, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/promine.v9i2.2433

Abstract

Discontinuity in a rock mass has an influence on the stability of a rock slope because it is one of the controlling factors of slope failure. In this study, an analysis was carried out on the role of discontinuities, namely joints and lithic tuff layers on slope stability and the effect of persistent parameters and joint roughness on the safety factor of safety factor. The analysis used is the effect of changes in the thickness of the lithic tuff, persistence and the value of joint roughness on the value of the safety factor. Processing of slope stability data using Rocscience RS2 Software with Finite Element Method modeling with rock mass modeling used in the analysis, namely the Veneziano Model. The results showed that an increase in the thickness of the lithic tuff layer resulted in a decrease in the safety factor of the slope up to 1.37%. The effect of the persistence parameter on the slope safety factor was found that the higher the persistence value, the lower the slope safety factor value up to 2,9% and changes in the JRC value decreased the safety factor value up to 1,7%.
Analisis Elasto Plastik Bukaan Silindris Berbasis Hoek-Brown pada Terowongan Kalilingseng Khalilullah, Hanif; Saptono, Singgih
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 4 (2025): November
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i4.1550

Abstract

The stability of tunnels excavated within heterogeneous rock masses necessitates analytical approaches capable of realistically representing elasto-plastic behavior. This study evaluates the elasto-plastic response of the Kalilingseng Tunnel (Kulon Progo) employing the Hoek–Brown (H–B) failure criterion and the analytical formulation of Carranza-Torres and Fairhurst (CTF) for cylindrical openings. Rock-mass parameters were derived from field-based classification (GSI = 50) and back-analysis using RocLab, yielding mb = 1.509, s = 0.003866, a = 0.5057, Erm = 1.76 GPa, and ν = 0.28. The in-situ stresses at a depth of 34 m indicate σv = 0.637 MPa, σh = 0.322 MPa, and a normalized stress S0 = 0.0252. Analytical results show an onset of plasticity characterized by a critical internal support pressure Pi* = 0.00213, a relative plastic zone radius ξ = 1.010 (≈1% beyond the excavation boundary), and a nondimensional radial closure Ur = 0.000487, corresponding to an actual displacement ur ≈ 0.73 mm for a tunnel radius b = 1.5 m. The wall-stress profile yields σr(b) = 0.0017 MPa and σθ(b) = 0.958 MPa, both well below the rock-mass strength. The resulting Ground Reaction Curve (GRC) exhibits a smooth, nonlinear decay without any abrupt deformation, consistent with the mild yielding regime described in the nondimensional CTF framework. These findings confirm that the rock mass remains inherently stable, implying that support strategies required for the tunnel are primarily deformation-control measures rather than structural reinforcement.
ANALISIS METODE NUMERIK PENGARUH HUJAN TERHADAP KESTABILAN LERENG TUNGGAL TIMBUNAN DI TAMBANG TERBUKA BATUBARA Akbar, Wahyu Nusantara; Dwinagara, Barlian; Saptono, Singgih; Haq, Shofa Rijalul; Lusantono, Oktarian Wisnu; Prabandaru, Prasodo Datu
Jurnal Teknologi Mineral dan Batubara Vol 21 No 1 (2025): Jurnal Teknologi Mineral dan Batubara Edisi Januari 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol21.No1.2025.1599

Abstract

Indonesia, with its tropical climate and high rainfall, especially near the equator, is prone to slope instability influenced by intense rainfall events. Rainfall increases pore water pressure, reduces effective stress, and decreases shear strength, which in turn lowers the safety factor and increases the probability of failure. However, studies on pore pressure changes during rainfall infiltration have not been extensively studied, particularly in Indonesia. This study aims to analyze the effect of rainfall on the stability of a single slope in a waste dump using a numerical method based on a coupled hydro-mechanical approach. Simulations were conducted using transient finite element analysis (TFEA) to evaluate pore water pressure variations. In addition, the limit equilibrium method (LEM) modeling was also carried out to assess changes in slope safety factors. The analysis was performed using Slide2 software under various rainfall and duration scenarios, with a total of 1,568 model combinations over a 24-hour simulation period. The results show that rainfall events reduce the safety factor value by up to 31.54%. The relationship between the safety factor value and rainfall can be expressed by the equation FK = 2,1607 CH-0,05, which shows a strong correlation with an R2 value of 0,9309.
ANALISIS METODE NUMERIK PENGARUH HUJAN TERHADAP KESTABILAN LERENG TUNGGAL TIMBUNAN DI TAMBANG TERBUKA BATUBARA Akbar, Wahyu Nusantara; Dwinagara, Barlian; Saptono, Singgih; Haq, Shofa Rijalul; Lusantono, Oktarian Wisnu; Prabandaru, Prasodo Datu
Jurnal Teknologi Mineral dan Batubara Vol 21 No 1 (2025): Jurnal Teknologi Mineral dan Batubara Edisi Januari 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol21.No1.2025.1599

Abstract

Indonesia, with its tropical climate and high rainfall, especially near the equator, is prone to slope instability influenced by intense rainfall events. Rainfall increases pore water pressure, reduces effective stress, and decreases shear strength, which in turn lowers the safety factor and increases the probability of failure. However, studies on pore pressure changes during rainfall infiltration have not been extensively studied, particularly in Indonesia. This study aims to analyze the effect of rainfall on the stability of a single slope in a waste dump using a numerical method based on a coupled hydro-mechanical approach. Simulations were conducted using transient finite element analysis (TFEA) to evaluate pore water pressure variations. In addition, the limit equilibrium method (LEM) modeling was also carried out to assess changes in slope safety factors. The analysis was performed using Slide2 software under various rainfall and duration scenarios, with a total of 1,568 model combinations over a 24-hour simulation period. The results show that rainfall events reduce the safety factor value by up to 31.54%. The relationship between the safety factor value and rainfall can be expressed by the equation FK = 2,1607 CH-0,05, which shows a strong correlation with an R2 value of 0,9309.
Co-Authors Akbar, Wahyu Nusantara Alfat, Sayahdin Andesta Granitio Irwan Ardya Pramesti Putri Arindry Aryanti, Dian Eka Astika Putri Roshinta Azizi, Masagus Ahmad Azkiya, Ahmad Azkal Bagus Wiyono Bagus Wiyono, Bagus Barlian Dwi Nagara Barlian Dwinagara Bartolomeus Windyaldi Saksono Cahyadi, Tedy Agung D Haryanto Dahono Haryanto Danu Mirza Reky Doli Jumat Rianto Dwi Yolanda Sumbung Eddy Winarno Eddy Winarno Edy Nursanto Faisal Akbar Putra Frampton, Samantha Michelle Fresly Widodo Malau Gabriel Ranteallo Gunawan Nusanto Haq, Shofa Rijalul Hariyadi, Sundek Hasywir Thaib s Hasywir Thaib Siri Hendra Rezkie Herry Sofyan Herry Sofyan Herry Sofyan Horman, Juanita R. Ilep Prengki Ilyasa, Muhammad Wildan Indun Titisariwati Indun Titisariwati, Indun Ir. H. Hasywir Thaib Siri, M.Sc, Ir. H. Hasywir Ira, Nurmaya Putri Kevin Bagaskara Khalilullah, Hanif Koesnaryo, S. Kurniawan Kurniawan Kurniawan Kurniawan Kurniawati, Savani Larasingati, Margaret Aubrey Linggasari, Shenny Lusantono, Oktarian Wisnu M. Dadang Wahyudi M. Dadang Wahyudi, M. Dadang M. Rahman Yulianto M. Rahman Yulianto Metboki, Matilda Misdiyanta, Partama Nurkhamim Oktarian Wisnu Lusantono Parissing, Vinsentia Peter Eka Rosadi Prabandaru, Prasodo Datu Putri Nova Haryu Dhanti Raden Hariyanto Raden Hariyanto, Raden Rahmatyo Gilang Trilaksono Ramadhan, Muhammad Raflie Resa Risal Pradita Rianse, Mohammad Suriyaidulman Rianto, Doli Jumat Ridho Kresna Wattimena Rika Ernawati Risaldi Hidayat S Koesnaryo S Koesnaryo S. Koesnaryo S. Koesnaryo Santika Adi Pradhana Sari B Kusumayudha Sari Bahagiarti Kusumayudha Shenny Linggasari Shofa Rijalul Haq Simarmata, Bestian Parnan Siwidiani, Indri Lesta Stefanus Jagad Sudarsono Sudarsono Tien Veny Vera Vega Vergiagara Vega Vergiagara Vergiagara, Vega Wawong Dwi Ratminah, Wawong Dwi Winda Winda Yulianto, M. Rahman