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All Journal IJOG : Indonesian Journal on Geoscience Jurnal AKAL: Abdimas dan Kearifan Lokal Petro : Jurnal Ilmiah Teknik Perminyakan Journal of Geoscience Engineering and Energy (JOGEE) JURNAL ABDI MASYARAKAT INDONESIA (JAMIN) Jurnal Eksakta Kebumian Scientific Contribution Oil and Gas
Imam Setiaji Ronoatmojo
Program Studi Teknik Geologi, Fakultas Teknologi Kebumian Dan Energi, Universitas Trisakti
Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Public Health Social Sciences Transportation Other

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ANALISIS BALIK LERENG LOWWALL PADA “BLOK X” KABUPATEN TANAH BUMBU, PROVINSI KALIMANTAN SELATAN: BACK ANALYSIS OF LOWWALL SLOPES IN "BLOCK X" DISTRICT TANAH BUMBU, SOUTH KALIMANTAN PROVINCE Putri, Al Zahra; Imam Setiaji Ronoatmojo; Wijaya, Budi
Journal of Geoscience Engineering and Energy VOLUME 5, NOMOR 1, FEBRUARI 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v5i1.19236

Abstract

Coal mining companies usually apply the open pit mining method in carrying out coal mining. Mining activities always have risks that cannot be avoided and unpredictable, one of which is a landslide in the mining area. Therefore, it is very necessary to control the risks of mining activities. One of them is like designing a slope design in the mine which is included in geotechnical aspects. And in the geotechnical aspect, it has a reverse analysis method that is very useful to determine the cause of avalanches in the area.
HUBUNGAN KEKUATAN LAPIS TANAH DASAR DENGAN METODE CBR TERHADAP INDEKS PLASTISITAS TANAH DAERAH SITU GADUNG KECAMATAN PAGEDANGAN KABUPATEN TANGERANG: RELATIONSHIP OF SUBGRADE SOILS USING CBR METHOD TOSOIL PLASTICITY INDEX IN SITU GADUNG AREAPAGEDANGAN TANGERANG DISTRICT Novela, Adita; Ronoatmojo, Imam Setiaji; Yuda, Himmes Fitra
Journal of Geoscience Engineering and Energy (JOGEE) VOLUME 5, NOMOR 2, AGUSTUS 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/azgtmr80

Abstract

Tanah yang sering mengalami masalah dalam pembangunan konstruksi geologi rekayasa adalah tanah lempung. Kerusakan jalan yang selama ini sering dijumpai dikarenakan tidak tersedianya data California Bearing Ratio (CBR) serta konsistensi tanah. Tujuan dari penelitian ini adalah, mengetahui nilai CBR dengan alat DCP, meninjai evaluasi kekuatan lapis tanah dasar, menentukan batas konsistensi tanah, dan menginterpretasikan korelasi berdasarkan data CBR dan Plasticity Index (PI). Metode penelitian dilakukan dengan CBR dengan alat DCP, pengambilan sampel tanah, serta pengukuran indeks plastisitas tanah langsung. Pada daerah penelitian ini diketahui memiliki tingkat konsistensi plastisitas tanah yang tinggi, kohesi, dan tanah lempung dengan nilai PL sebesar 28,85% - 48%. Kemudian didapat nilai indeks plastisitas (PI) daerah penelitian yang memiliki nilai 25,15%-36,82%. Maka hasil PI ini mempunyai tingkat indeks plastis yang tinggi, tanah yang kohesif serta tipe tanah atau jenis yang lempung sehingga buruk untuk konstruksi di atasnya karena potensi swelling lempung. Kemudian untuk data CBR daerah penelitian didapat sebesar 5,05-5,55% dengan soil type lempung termasuk zona yang buruk/rendah.  The soil that often experiences problems in the construction of engineering geological construction is clay soil. Road damage that has often been encountered is due to the unavailability of California Bearing Ratio (CBR) data and soil consistency. The purpose of this research is to determine the CBR value using the DCP tool, review the evaluation of the strength of the subgrade layer, determine the soil consistency limit, and interpret correlation based on CBR and Plasticity Index data. The research method was carried out using CBR with a DCP tool, taking soil samples, and directly measuring the soil plasticity index. This research area is known to have a high level of consistent soil plasticity, cohesion, and clay soil with a PL value of 28,85% - 48%. Then the plasticity index (PI) value for the research area was obtained which had a value of 25,15% -36.82%. Therefor this plasticity index has high plasticity, cohesive properties and a clay type of soil so it is bad for construction on it because of the potential for clay swelling. Then the CBR data for the research area was found to be 5.05-5.55% with a clay soil type including poor/low zones.
PENGARUH BEBAN GEMPA BERDASARKAN PUSGEN 2017 DAN STANDAR NASIONAL INDONESIA DI TEBING CITATAH 125: EFFECT OF EARTHQUAKE LOADS BASED ON PUSGEN 2017 AND INDONESIAN NATIONAL STANDARDS ON CITATAH 125 CLIFFS Ardikasa, Gentala; Ronoatmojo, Imam Setiaji
Journal of Geoscience Engineering and Energy (JOGEE) VOLUME 5, NOMOR 2, AGUSTUS 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/w4bam255

Abstract

Tebing Citatah merupakan suatu kawasan wisata dan olahraga panjat tebing yang berada di kawasan Kabupaten Bandung Barat, Tebing Citatah terletak di Pamucatan dan disekitarnya terdapat sesar Cimandiri yang terbentang dengan arah NE-SW dari Padalarang ke Pelabuhan Ratu sepanjang 100 km. Karena didapatkan daerah penelitian yang berada di sekitar segmen sesar Cimandiri, maka perlu dilakukan analisis pengaruh beban gempa yang dikorelasikan terhadap Standar Nasional Indonesia (SNI) untuk ketentuan nilai Peak Ground Acceleration (PGA) dan selanjutnya akan diambil nilai PGA dari ketentuan PUSGEN 2017. Analisis lereng menggunakan metode Bishop dengan kriteria Generalized Hoek-Brown dan Mohr-Couloumb, dimana material properties kriteria Generalized Hoek-Brown terdapat Uniaxial Compressive Strength (UCS), Geological Strength Index (GSI), nilai konstanta mi, dan Disturbance Factor (D) yang cocok digunakan untuk lereng yang berupa batuan, sedangkan material properties untuk kriteria Mohr-Couloumb berisi kohesi dan sudut geser dalam yang cocok digunakan untuk lereng yang berupa tanah seperti material timbunan. Nilai FK yang didapatkan pada kondisi tanpa beban gempa sebesar 5,513 yang dikategorikan aman berdasarkan SNI8460:2017, sedangkan pada kondisi setengah beban gempa FK didapatkan sebesar 4,010 yang dikategorikan aman, dan untuk kondisi beban gempa penuh didapatkan FK sebesar 3,153 yang dikategorikan aman. Citatah Cliff is a tourist and sports rock climbing area located in the West Bandung Regency area. Citatah Cliff is located in Pamucatan and around it there is the Cimandiri fault which stretches in a NE-SW direction from Padalarang to Pelabuhan Ratu for 100 km. Because the research area was found to be around the Cimandiri fault segment, it is necessary to analyze the influence of earthquake loads which are correlated with the Indonesian National Standard (SNI) for the Peak Ground Acceleration (PGA) value provisions and then the PGA value will be taken from the 2017 PUSGEN provisions. Slope analysis using the Bishop method with Generalized Hoek-Brown and Mohr-Couloumb criteria, where the material properties of the Generalized Hoek-Brown criteria include Uniaxial Compressive Strength (UCS), Geological Strength Index (GSI), mi constant value, and Disturbance Factor (D) which are suitable for use for rock slopes, while the material properties for the Mohr-Coulomb criteria contain cohesion and internal shear angles which are suitable for use on soil slopes such as embankment material. The FK value obtained in conditions without earthquake load was 5,513 which was categorized as safe based on SNI8460:2017, while in half earthquake load conditions the FK was obtained at 4,010 which was categorized as safe, and for full earthquake load conditions the FK was obtained at 3,153 which was categorized as safe.
ANALISIS KESTABILAN LERENG TAMBANG DENGAN ASPEK PEMODELAN AIR TANAH  PADA PIT X, PT JHONLIN BARATAMA, DESA SERONGGA,KABUPATEN TANAH BUMBU, PROVINSI KALIMANTAN SELATAN: MINE SLOPE STABILITY ANALYSIS WITH GROUNDWATER MODELINGASPECTS IN PIT X, PT JHONLIN BARATAMA, SERONGGA VILLAGE,TANAH BUMBU DISTRICT, SOUTH KALIMANTAN PROVINCE Sinulingga, Asya Sridah; Ronoatmojo, Imam Setiaji
Journal of Geoscience Engineering and Energy (JOGEE) VOLUME 5, NOMOR 2, AGUSTUS 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/sn9w0p22

Abstract

Air tanah yang mengisi ruang pori pada batuan atau tanah pada tubuh lereng dapat menyebabkan terjadinya pengurangan kuat geser batuan. Lokasi penelitian termasuk dalam wilayah Cekungan Barito. Data primer berupa data elevasi muka air tanah dan konduktivitas hidrolik material timbunan. Perhitungan repose angle berdasarkan perhitungan pada perubahan elevasi menggunakan hukum trigono metri. Pengolahan data menggunakan bantuan software Geostudio 2022 analisis SEEP/W untuk pemodelan air tanah dan SLOPE/W untuk analisis kestabilan lereng. Nilai konduktivitas hidrolik diketahui melalui metode lapangan slug test. Hasil slug test menunjukkan bahwa konduktivitas hidrolik pada material timbunan sebesar 4,2052 × 10-6 m/s. Hasil analisis kestabilan lereng berupa nilai Faktor Keamanan menunjukkan bahwa kondisi air tanah pada lereng timbunan daerah penelitian mendekati jenuh. Groundwater that fills pore spaces in rocks or soil on slopes can cause a reduction in the shear strength of rocks. The research location is included in the Barito Basin area. Primary data consists of data on groundwater level elevation and hydraulic conductivity of embankment material. Repose angle calculations are based on calculations of elevation changes using the laws of trigonometry. Data processing uses Geostudio 2022 software, SEEP/W analysis for groundwater modeling and SLOPE/W for slope stability analysis. The hydraulic conductivity value is determined through the field slug test method. The slug test results show that the hydraulic conductivity of the embankment material is 4.2052 × 10-6 m/s. The results of the slope stability analysis in the form of Safety Factor values ​​show that the groundwater conditions on the embankment slopes in the research area are approaching saturation. 
ANALISIS STABILITAS LERENG PADA PERENCANAAN BENDUNGAN JLANTAH DIDESA TLOBO, KECAMATAN JATIYOSO, KABUPATEN KARANGANYAR PROVINSI JAWA TENGAH: SLOPE STABILITY ANALYSIS IN THE JLANTAH DAM PLANNING AT TLOBO VILLAGE, JATIYOSO SUB-DISTRICT, KARANGANYAR DISTRICT, CENTRAL JAVA PROVINCE Dwi Saputra, Zanuar; Ronoatmojo, Imam Setiaji
Jurnal Eksakta Kebumian Vol. 3 No. 1 (2022): JURNAL EKSAKTA KEBUMIAN (JEK)
Publisher : Fakultas Teknologi Kebumian dan Energi, Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jek.v3i1.16112

Abstract

ABSTRAK Stabilitas lereng merupakan faktor utama yang harus diperhatikan dalam kegiatan perencanaan pembangunan PT. Virama Karya yang terletak pada kecamata Jatiyoso, di karenakan dapat mengganggu kelancaran pembangunan dan dapat membahayakan keselamatan pekerja hal – hal yang dapat menyebabkan leren tidak stabil antara lain yaitu gempa bumi, struktur geologi, peledakan, dan material batuan penyusun lereng, pada penelitian ini dapat menggunakan metode RMR, SMR, dan GSI untuk dapat mengindentifikasikan dan memberikan rekomendasi terhadap kondisi lereng, kemudian menggunakan metode Janbu untuk mendapatkan hasil dari nilai faktor keamanan, pada penelitian ini didapatkan hasil pengukuran geometri lereng yang didapatkan dengan nilai Single Slope 50, tinggi 50 meter, lebar 80 meter, panjang jenjang Kata kunci: Stabilitas Lereng, RMR, SMR, GSI, Faktor Keamanan (FK) ABSTRACT Slope stability is an important factor that is considered on the bridge which is one of the accesses in the construction of hydropower at the JatiGede dam because it can interfere with the smooth transportation of materials in the construction of hydropower, things that can cause slopes to become unstable are earthquakes, geological structures, and materials. In this study, the slope compilers used the RMR and GSI methods to identify and provide recommendations for slope conditions, then used the Janbu method to obtain the safety factor value, in this study the rock mass conditions on scanlines 1 to 5 were very blocky and rough surface conditions. , weathered rock condition, the safety factor value on the slope is 0.497, and has a sliding wedge type landslide potential of 21.54%. Based on the recommendation slopes made with Slide 6.0 software in order to get a FK value> 1.25 to produce stable slope conditions and can minimize the dangers that can occur.
The Linear and Non-Linear Background Energy Approach in The Seismic S/N Ratio Enhancement Imam Setiaji Ronoatmojo; Yarra Sutadiwiria; Muhammad Burhannudinnur; Dewi Syavitri
Scientific Contributions Oil and Gas Vol. 46 No. 2 (2023): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.46.2.318

Abstract

Side-swept is often understood as a side sweep of seismic waves that occurs on the surface. This understanding creates confusion when considering that side-swept is a part of linear function, in fact side-swept could be in the form of sweeping waves from the reflector on the side, so side-swept is a non-linear function like a signal. The implications for noise reduction with the t-p transformation becomes more complex. The elimination of side-swept in this study, relies on an application using an algorithm developed by Hampson (1987). Initial data conditioning preparation should be needed to clarify the difference between linear and non-linear functions through static refraction correction and velocity analysis, then coherent noise elimination (ground-droll) is carried out through f-k domain transformation, as well as random noise through f-x domain transformation. Side-swept is eliminated in t-p domain. Energy observation shows the remaining noise energy caused by coherent noise, random noise and non-linear side-swept functions. It proves that it is difficult to remove a non-linear function that overlaps the reflector signal. The best step is to minimize coherent (linear) noise and random noise by consistently using an amplitude correction indicator on the surface and performing velocity analysis especially for the suspected power spectrum as an effort to attenuate side-swept wave interference on the reflector signal. Finally, the signal restoration efforts due to non-linear noise attenuation, is carried out by surface consistent deconvolution
The Influence of Side-Slip Velocity on Subsurface Displacement Imam Setiaji Ronoatmojo; Muhammad Burhannudinnur; Yarra Sutadiwiria; Dewi Syavitri
Scientific Contributions Oil and Gas Vol. 47 No. 2 (2024): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This research aimed to determine the influence of side-slip velocity on subsurface displacement during seismic data acquisition. Anisotropy constants were used to determine the depth migration process before stack, which showed inadequate results after data validation. Therefore, the forward modeling of a medium, which comprised anisotropy constants of normal and offset raytracing was conducted to address this problem. The configuration of source to receiver were orthogonal and slant. The results showed that the migration process failed to resolve the geological structures of the position shifting. The configuration of source to receiver were orthogonal and slant. The results show the better continuity of slant and the influence of complex geological structures controls the position shifting, which could not be resolved by the migration process. It could be seen from the random distribution of the normal shift of group velocity and phase velocity, as well as the CDP – CRP shift. It produced wave azimuth rotation in a discontinuity plane, such as fault and anticline ridge. This azimuth rotation was strongly suspected to cause inaccurate anisotropy constants implementation in pre-stack depth migration process. Keywords: side-slip velocity, anisotropy constants, migration, normal displacement, CDP-CRP displacement
Updated Geochemical Characterization of Hydrocarbon Potential of Surface Sample in Lariang-Karama Sub-Basin, West Sulawesi, Indonesia Yarra Sutadiwiria; Muhammad Taufiq Fathaddin; Imam Setiaji Ronoatmojo; Dewi Syavitri; Cahyaningratri P.R.; Barona Belladesta; Yeftamikha Yeftamikha; Andy Livsey
Scientific Contributions Oil and Gas Vol. 47 No. 2 (2024): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The Lariang-Karama Sub-Basin is situated within the Makassar Basin, located in the West Sulawesi region. It has source of rocks which has the potential to produce hydrocarbons and to become a target for new field discoveries in hydrocarbon exploration activities. It is on this basis that the authors are interested in conducting research in the Makassar Basin area and its surroundings, which has been carried out since 2017. This is a comprehensive literature review study from 2017 to 2022, focusing on the origin and composition of biomarkers, paleogeography of facies sources from oil seeps (2017-2018), paleofacies and biomarker characteristics of Paleogene to Neogene rocks (2019), contribution of terrestrial materials based on geochemical and biostratigraphic analysis (2020), tectonic processes occurring in the basin, and geochemical characterization of source rocks in the research area (2022). The FS-12 surface sample in shale may belong to the Kalumpang Formation, located in West Sulawesi. The results of TOC analysis were 0.62%, indicating sufficient quantity. Based on the results of the cross plot between HI values of < 50 and Tmax of 499 °C, the category was found to be overmature and could not produce hydrocarbons. The results of this research, along with those of previous research and the latest geochemical study, were obtained in the West Sulawesi region and the eastern Makassar Strait. These findings consisted of marine shale source rocks in West Sulawesi and lacustrine shale source rocks in the eastern Makassar Strait
GROUTING MERUPAKAN CARA PERBAIKAN YANG TEPAT PADA DASAR PONDASI RIVERBED BENDUNGAN SADAWARNA, SUBANG, JAWA BARAT: GROUTING IS THE RIGHT WAY TO REPAIR THE RIVERBED FOUNDATION OF THE SADAWARNA DAM, SUBANG, WEST JAVA Rachmayanti, Zarah; Ronoatmojo, Imam Setiaji; Fitra Yuda, Himmes
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22157

Abstract

Dibangunan Bendungan, terdapat beberapa konstruksi yaitu main dam, riverbed, spillway, saddle dam dan masih banyak lagi. Dibagian riverbed yaitu fondasi bagian dari sungai atau aliran air yang tertahan di belakang bendungan. Dasar sungai juga berfungsi untuk menyalurkan air ketika air mengalir melalui spillway atau saluran pelepasan. Hal tersebut guna memenuhi persyaratan yang mengacu pada pedoman keamanan bendungan dari Kementerian PUPR. Evaluasi geologi teknik yang rinci perlu diberikan pada kondisi dasar fondasi, khususnya pada struktur saddle dam. Grouting menjadi salah satu teknik yang digunakan untuk memperbaiki dan meningkatkan efisiensi dasar fondasi guna memastikan keamanan dan stabilitas bangunan. Maka dari itu, fondasi bendungan wajib kedap air untuk mencegah rembesan atau kebocoran. Salah satu cara untuk mem perbaiki kerusakan yang disebabkan oleh deformasi struktur tanah atau batuan adalah dengan melakukan perbaikan fondasi dengan grouting. Pada umumnya kondisi tanah/batuan yang memiliki bidang diskontinuitas di bawah permukaan akibat kekar. Kondisi demikian akan menyebabkan nilai permeabilitas pada tanah /batuan tersebut menjadi tinggi. Hal ini akan menimbulkan kebocoran yang dapat mengakibatkan terjadinya kerusakan bendungan. Perbaikan yang perlu dilakukan  adalah dengan mengurangi rembesan air sehingga angka koefisien permeabilitas nya (nilai Lugeon) menjadi kecil. Untuk perbaikan fondasi tersebut dapat ditangani dengan menggunakan teknik injeksi semen (grouting) yang dilakukan pada bagian paling buruk kelas batuannya dan paling tinggi angka koefisien permeabilitasnya (nilai lugeon). In the dam building, there are several constructions, including main dam, riverbed, spillway, saddle dam and others. The riverbed section is the foundation of the part of the river or water flow that is blocked behind the dam. The riverbed also functions to channel water when the water flows through a spillway or release channel. This is to fulfill the requirements that refer to the dam safety guidelines from the Ministry of PUPR. A detailed engineering geological evaluation needs to be given to the basic condition of the foundation, especially the saddle dam structure. Grouting is one of the techniques used to repair and increase the efficiency of the foundation base to ensure the safety and stability of the dam. Therefore, the dam foundation must be watertight to prevent seepage or leaks. One way to repair damage caused by deformation of soil or rock structures is to repair the foundation with grouting. In general, soil/rock conditions have areas of discontinuity below the surface due to joints. Such conditions will cause the permeability value of the soil/rock to be high. This will cause leaks which can result in dam damage. Improvements that need to be made are to reduce water seepage so that the permeability coefficient (Lugeon value) becomes small. Foundation repairs can be handled using cement injection techniques (grouting) which are carried out on the parts with the worst rock class and the highest permeability coefficient (lugeon value).
STUDI PERBANDINGAN KESTABILAN LERENG DENGAN VARIASI KEMIRINGAN LERENG PADA LAPANGAN “X” DAERAH LAHAT, SUMATRA SELATAN: COMPARATIVE STUDY OF SLOPE STABILITY WITH SLOPE VARIATIONS IN FIELD “X” LAHAT, SOUTH SUMATRA Koro, Margaretha Inggrid Wuno; Ronoatmojo, Imam Setiaji
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22244

Abstract

PT Berkah Daya Sukses merupakan salah satu perusahaan tambang batubara yang berada di Kabupaten Lahat, Sumatra Selatan. Analisis kestabilan lereng ini penting dilakukan di daerah pertambangan karena berkaitan dengan pendapatan dan juga keselamatan dari pekerja yang berada di kawasan tersebut. Dilakukan perhitungan Faktor Keamanan dengan menggunakan software Slide 6.0 dengan membuat dua pemodelan antara litologi yang sudah terkena deformasi atau memiliki dip (real di lapangan) dan litologi yang belum terkena deformasi (asumsi) dengan lima kemiringan yang berbeda  mulai dari kemiringan 55o, kemiringan 50o, kemiringan 45o, kemiringan 40o, dan kemiringan 35o untuk mengetahui pengaruh dip terhadap kestabilan lereng. Diperoleh hasil faktor keamanan untuk litologi yang memiliki dip yaitu 0,902; 0,989; 1,116; 1,204; dan 1,298 dan untuk litologi datar yaitu 1,022; 1,157; 1,221; 1,273; dan 1,315. Dari perhitungan yang telah dilakukan menunjukkan bahwa kemiringan litologi ini cukup berpengaruh terhadap kestabilan lereng pada daerah penelitian hal ini ditunjukkan dengan angka faktor keamanan pada litologi datar lebih stabil daripada litologi dengan dip hal ini disebabkan oleh lereng yang litologinya mempunyai dip menghasilkan intensitas rembesan yang lebih banyak dibandingkan dengan lereng yang tidak memiliki dip (litologi datar). Berbedanya intensitas rembesan pada dua pemodelan ini karena pada litologi dengan dip adanya kontak antar pada setiap lapisan yang dapat menjadi jalan keluarnya air sedangkan pada litologi datar air cenderung menyebar lebih merata dan terarah sehingga kemungkinan untuk terjadi rembesan lebih sedikit. Rembesan yang terjadi ini akan meningkatkan tekanan pori serta mempengaruhi gaya geser sehingga kestabilan lereng pada litologi dengan dip lebih tidak stabil. PT Berkah Daya Sukses is one of the coal mining companies located in Lahat Regency, South Sumatra. This slope stability analysis is important to carry out in mining areas because it is related to income and also the safety of workers in the area. The calculation of the Safety Factor was carried out using Slide 6.0 software by making two models between lithology that has been affected by deformation or has a dip (real in the field) and lithology that has not been affected by deformation (assumption) with five different slopes starting from slope 55o, slope 50o, slope 45o, slope 40o and slope 35o to determine the effect of dip on slope stability. The results of the safety factor for lithology that have a dip of 0.902 were obtained; 0,989; 1,116; 1,204; and 1,298 and for flat lithology, which is 1,022; 1,157; 1,221; 1,273; and 1,315. From the calculations that have been carried out, it is shown that the slope of this lithology is quite influential on the stability of the slope in the study area, this is shown by the number of safety factors in flat lithology is more stable than lithology with dip, this is due to slopes whose lithology has dip, resulting in more seepage intensity compared to slopes that do not have dip (flat lithology). The difference in seepage intensity in these two modeling is because in lithology with dip there is contact between each layer which can be the outlet of water, while in flat lithology water tends to spread more evenly and directionally so that there is less possibility of seepage. This seepage will increase the pore pressure and affect the shear force so that the slope stability in lithology with dips is more unstable.
Co-Authors Abdul Hamid Abdurrachman Asseggaf Akmalia Putri, Deyana Andry Prima Andy Livsey Ardikasa, Gentala Arkhandiaz Shalimar Bani Nugroho Barona Belladesta Benyamin Benyamin Bronto Sutopo Budi Wijaya Cahaya Rosyidan Cahyaningratri P.R. Cahyaningratri Prima Riyandhani Dedi Sunjaya Dwi Saputra, Zanuar Erick Estrada Dolok Saribu Erick Estrada Dolok Saribu Fadilah, Muhammad Irfan Faruq Daniswara Filipus Armando Armando Ginting Firman Herdiansyah Fitra Yuda, Himmes Hadi Taqiuddin, Akrom Harry Pramudito Harry Pramudito, Harry Heru P Sanusi Himmes Fitra Yuda Kefi Rahmadio Koro, Margaretha Inggrid Wuno Meirawaty, Mira Mira Meirawaty Mohammad Apriniyadi Muhammad Burhannudinnur Muhammad Irfan Fadilah Muhammad Naufa Syafrun Muhammad Taufiq Fathaddin, Muhammad Taufiq Muhammad Yusril Ihza Mahendra Triany Novela, Adita Novi Triany premjit singh singh Putri, Al Zahra Rachmayanti, Zarah Rahmadio, Kefi Rosiyanti Sinaga Rosmalia Dita Nugraheni Rosmalia Dita Nugraheni Samsol Sinaga, Rosiyanti Sinulingga, Asya Sridah Syavitri, Dewi Yarra Sutadiwiria Yeftamikha Yeftamikha Yuda, Himmes Fitra Zanuar Dwi Saputra Zefanya Gian Aginta Kembaren Zefanya Gian Aginta Kembaren Zefanya Gian Aginta Kembaren Zefanya Gian Aginta Kembaren, Zefanya Gian Aginta Kembaren