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LOWWALL SLOPE STABILITY OF PANEL 32 AND PANEL 36 PT. XYZ, SOUTH KALIMANTAN Jamil, Aliyuddin; Sophian, Raden Irvan; Rendra, Pradnya Paramarta Raditya
Journal of Geological Sciences and Applied Geology Vol 7, No 1 (2023): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i1.48196

The research was conducted in the coal mining area of PT. XYZ, South Kalimantan. The research aims to create a geological model for each cross-section according to the characteristics of materials and to calculate the slope stability of the lowwall slope. The researcher calculated the slope stability using Morgenstern-Price method with Rocscience Slide2 software. The geological conditions of the study area are composed of alternating sandstones with coal-inserted claystone and coal-inserted claystone from the Warukin Formation. Material properties at the study area are composed of sandstone, claystone, and coal. The results of the slope stability simulation show that the lowwall panel 32 slope has a safety factor value of 1.081 while the lowwall panel 36 slope has a safety factor value of 1.107.

EFFECT OF BEDDING PLANES ON SLOPE STABILITY IN COAL OPEN MINE PT. PAMAPERSADA NUSANTARA DISTRICT ASMI, CENTRAL KALIMANTAN Akbar, Faisal; Sophian, Raden Irvan; Muslim, Dicky; Manullang, Sahala
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i1.29069

Bedding planes are one of the distinctive features of an open coal mine. The presence of the bedding planes can be a slip surface on a slope that has a dip direction relatively in the same direction as the bedding planes. Kinematic analysis for open pit slopes is one important aspect of the influence of the bedding planes in minimizing the occurrence of landslides. The purpose of this research is to explain the effect of the presence of bedding planes on slope stability. The method used is secondary data collection, field observations, and kinematic analysis. The results showed that the slopes of the study area were composed of sandstone, claystone, siltstone, carbonaceous claystone, and coal. Carbonanaceous claystone as a weakly layer. The rock bedding area on this slope has a strike/dip N 288 ° E / 17 °, while the slope of the research has an overall slope 29 ° and a slope dip direction N 15 ° E. The dip direction value that is relatively unidirectional between the bedding planes and the slope of the research with a difference of 3 ° can be the cause of the slip surface and is prone to landslides. Thus, the slopes of the study area have the potential plane failure so that geotechnical engineering is needed in the next mining process to ensure slope stability.

POTENSI LONGSOR AKIBAT AKTIVITAS PENAMBANGAN ILEGAL DI KECAMATAN SUNGAI DURIAN, KABUPATEN KOTABARU Wahyuzi, Radhi; Muslim, Dicky; Zakaria, Zulfiadi; Sukiyah, Emi; Sophian, Raden Irvan
Jurnal Teknologi Mineral dan Batubara Vol 20 No 2 (2024): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No2.2024.1567

Generally, landslide potential can occur when a materials drifting force dominates the resisting force. A state of equilibrium is reached when the two aspects are in comparable conditions, or when the force of drift is less than the force of resistance. Spatial changes, morphological changes and changes in land use are often the cause of landslides if these changes are not properly planned and carried out without taking into account the principles of geotechnical engineering. One of the changes brought about by land use change is mining activity, in which very large morphological changes occur during the mining operation. These changes will usually have the potential to cause landslides if they are not managed in a proper and correct procedure. However, ilegal mining communities always appear and carry out mining operations without considering the principles of Good Mining Practices, so it will be quite dangerous for the environment and human beings, both in terms of potential landslide hazards and environmental damage. The purpose of this study is to determine the area and potential landslide hazard in the unlicensed community mining area using satellite imagery and slope stability analysis at the mining site. This research was conducted using a combination of geotechnical laboratory testing methods and field observations, as well as slope stability analysis, in order to determine the landslide potential at the research site. In general, the research data clearly shows that the slope formed due to ilegal mining activities has a factor of safety value in an unstable condition (0.516-1.076) with a probability of failure ranging from 15%-20%, and has a high consequence of failure status. The research data indicates that the research site is experiencing an unstable condition, which is likely the result of ilegal mining activities with the potential of landslides in the research site.

POTENSI LONGSOR AKIBAT AKTIVITAS PENAMBANGAN ILEGAL DI KECAMATAN SUNGAI DURIAN, KABUPATEN KOTABARU Wahyuzi, Radhi; Muslim, Dicky; Zakaria, Zulfiadi; Sukiyah, Emi; Sophian, Raden Irvan
Jurnal Teknologi Mineral dan Batubara Vol 20 No 2 (2024): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No2.2024.1567

Generally, landslide potential can occur when a materials drifting force dominates the resisting force. A state of equilibrium is reached when the two aspects are in comparable conditions, or when the force of drift is less than the force of resistance. Spatial changes, morphological changes and changes in land use are often the cause of landslides if these changes are not properly planned and carried out without taking into account the principles of geotechnical engineering. One of the changes brought about by land use change is mining activity, in which very large morphological changes occur during the mining operation. These changes will usually have the potential to cause landslides if they are not managed in a proper and correct procedure. However, ilegal mining communities always appear and carry out mining operations without considering the principles of Good Mining Practices, so it will be quite dangerous for the environment and human beings, both in terms of potential landslide hazards and environmental damage. The purpose of this study is to determine the area and potential landslide hazard in the unlicensed community mining area using satellite imagery and slope stability analysis at the mining site. This research was conducted using a combination of geotechnical laboratory testing methods and field observations, as well as slope stability analysis, in order to determine the landslide potential at the research site. In general, the research data clearly shows that the slope formed due to ilegal mining activities has a factor of safety value in an unstable condition (0.516-1.076) with a probability of failure ranging from 15%-20%, and has a high consequence of failure status. The research data indicates that the research site is experiencing an unstable condition, which is likely the result of ilegal mining activities with the potential of landslides in the research site.

PERAN INTENSITAS HUJAN TERHADAP STABILITAS LERENG DI DAERAH JATISARI, KECAMATAN BOJONGPICUNG, KABUPATEN CIANJUR, PROVINSI JAWA BARAT Sholtan, Devanya Anantasya; Sophian, Raden Irvan; Hardiyono, Adi; ., Iskandar
Bulletin of Scientific Contribution Vol 22, No 3 (2024): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v22i3.59017

Pada tanggal 25 April 2024 diketahui telah terjadi peristiwa gerakan tanah di daerah Jatisari, Kecamatan Bojongpicung, Kabupaten Cianjur, Provinsi Jawa Barat. Menurut keterangan warga sekitar, persitiwa tersebut terjadi setelah hujan dengan durasi yang cukup panjang. Studi ini bertujuan untuk melihat keterkaitan hujan dengan persitiwa gerakan tanah yang terjadi di daerah Jatisari. Metode yang dilakukan pada penelitian ini meliputi pengamatan lapangan, pembuatan geometri lereng, pengujian laboratorium, dan pemodelan. Pemodelan yang dilakukan berupa analisis rembesan air hujan dengan perangkat lunak Geostudio SEEP/W dan analisis kestabilan lereng dengan perangkat lunak Geostudio Slope/W. Dari analisis tersebut diketahui hujan yang terjadi selama 12 hari dengan intensitas 1.8 mm/jam atau hujan 6 hari dengan intensitas 60 mm/jam dapat menurunkan faktor keamanan (FK) hingga rentang nilai 0.684 – 0.763. Mekanisme berkurangnya kestabilan lereng ini terjadi akibat hilangnya matric suction. Hilangnya matric suction merupakan pengaruh dari infiltrasi air hujan ke dalam permukaan lereng.

GEOTECHNICAL ENGINEERING DESIGN FOR SETTLEMENT MITIGATION IN THE DEEP FOUNDATION CONSTRUCTION AREA, NORTH SUMATRA PROVINCE, INDONESIA Malik Muhammad, Kemal; Sophian, Raden Irvan; Helmi, Faisal; Prasetyo, Rahmat Dwi; Damanhuri, Hilman
Bulletin of Scientific Contribution Vol 22, No 3 (2024): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v22i3.59032

The construction project in area Y, North Sumatra will be installed with piles as the preliminary foundation for a multi-story building. The installation of these piles resulted in settlement at several boreholes points analyzed using Rocscience Settle3. The settlement ranged from 65 mm - 95 mm at over 11 boreholes over the construction area. This settlement has the potential to cause structural damage to the building, therefore geotechnical engineering is needed as a solution to prevent it. Ground improvement as geotechnical engineering can be done to support the design of safer foundations by increasing soil consistency in shallow to deep layers. Vibro compaction geotechnical engineering reduces the total settlement of the research area from 90 mm to 68 mm in BH-01, BH-04, and BH-06. In boreholes with low bearing capacity and medium settlement values such as BH-1, monitoring using a settlement gauge is required to provide efficient prevention in safe foundation planning without neglecting cost effective concern.

JENIS LONGSORAN BERDASARKAN BIDANG DISKONTINUITAS PADA TAMBANG TERBUKA BATUBARA PT. PAMAPERSADA NUSANTARA DISTRIK ASMI, KALIMANTAN TENGAH Akbar, Faisal; Sophian, Raden Irvan; Muslim, Dicky; Manullang, Sahala
Bulletin of Scientific Contribution Vol 18, No 2 (2020): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v18i2.27598

Kehadiran struktur geologi pada lereng tambang terbuka merupakan kerugian yang dapat menjadikan lereng tidak stabil atau rentan longsor. Analisis kinematik untuk lereng tambang terbuka merupakan salah satu aspek yang penting terhadap pengaruh struktur geologi dalam meminimalisir terjadinya tanah longsor. Tujuan dari penelitian ini yaitu untuk mengetahui potensi tipe longsoran pada lereng penelitian. Metode yang dilakukan yaitu dengan pengumpulan data sekunder, observasi lapangan, dan analisis kinematik. Hasil penelitian menunjukkan bahwa lereng daerah penelitian disusun oleh material batuan sedimen berupa batupasir, batulempung, batulanau, batulempung karbonan, dan batubara. Struktur geologi yang berkembang berupa kekar dan dua buah sesar normal yang berdekatan serta memiliki strike/dip 317°E/74° dan N 296°E/35°. Akibat dari perbedaan nilai strike/dip tersebut menyebabkan sesar normal saling berpotongan yang dapat menjadi penyebab longsoran. Dengan demikian, lereng daerah penelitian memiliki potensi tipe longsoran baji sehingga perlu dipertimbangkan dalam proses penambangan selanjutnya.Kata kunci : analisis kinematik, kestabilan Lereng, struktur geologi

PENENTUAN KESTABILAN LERENG MENGGUNAKAN KUALITAS MASSA BATUAN PADA AREA LOWWALL PIT X PT. BUKIT ASAM TBK SUMATRA SELATAN Khodijah, Siti; Monica, Utari Sonya; Ersyari, Jordistriawan; Khoirullah, Nur; Sophian, Raden Irvan
Bulletin of Scientific Contribution Vol 20, No 3 (2022): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v20i3.42691

Daerah penelitian memiliki kondisi geologi yang cuku kompleks yaitu termasuk ke cekungan Sumatra Selatan. Formasi Muara Enim merupakan formasi penghasil batubara ekonomis pada daerah penelitian. Proses penambangan pada PT. Bukit Asam Tbk yaitu metode tambang terbuka sehingga proses penggaliannya berhubungan dengan kestabilan lereng dan sifat keteknikannya. Pit X diiterpretasikan sebagai sayap antiklin utara Muara Tiga Besar dengan jurus perlapisan batuan relatif ke arah barat laut sehingga memiliki bentuk pit relatif searah jurus perlapisan batuan. Area lowwall sebagai lereng yang didesain mengikuti kemiringan perlapisan batuan menjadi ketertarikan dalam melakukan penelitian dikarenakan berpotensi tinggi terjadi longsoran bidang sehingga perlu dilakukan analisis kualitas massa batuannya. Metode Rock Mass Rating merupakan pembobotan bersistem dalam menentukan kualitas massa batuan dan dapat digunakan untuk menilai stabilitas lereng dan rekomendasi sudut aman maksimal yang dapat diterapkan melalui Slope Mass Rating. Kaitannya dengan kualitas massa batuan, dilakukan pengamatan pada 8 titik massa batuan selain batubara pada area lowwall Pit X menggunakan metode scanline. Berdasarkan pembobotan rock mass rating, daerah penelitian terdiri dari 2 (dua) kelas massa batuan yaitu kelas III (fair rock) dan IV (weak rock). Berdasarkan slope mass rating, daerah penelitian terdiri dari lereng bad dengan stabilitas tidak stabil dan lereng normal dengan stabilitas stabil sebagian. Adapun sudut lereng yang direkomendasikan pada area lowwall berkisar antara 30°-34°. Kata kunci: area lowwall, massa batuan, RMR, SMR, sudut aman lereng

THE VOLCANIC DEPOSIT WEATHERED PRODUCT IN JATINANGOR AREA, WEST JAVA Sophian, Raden Irvan; Abdurrokhim, .; Haryanto, Iyan; Hendarmawan, .
Bulletin of Scientific Contribution Vol 15, No 2 (2017): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKPembangunan di Kawasan Jatinangor dalam beberapa waktu ini telah mengalami perkembangan yang cukup pesat. Jatinangor adalah daerah baru yang dikembangkan untuk Pendidikan dari beberapa kampus seperti Unpad, ITB, IKOPIN, dan IPDN. Hal ini menyebabkan peningkatan jumlah penduduk tiap tahunnya dan juga menyebabkan berkembangnya infrastruktur untuk mendukung kegiatan Pendidikan di daerah ini. Untuk mengetahui hambatan dan menghindari terjadinya bencana alam di masa depan, maka harus dipahami perilaku tanah permukaan sebagai pondasi bangunan berbagai sarana prasarana. Metode penelitian meliputi pemetaan geologi teknik, pengambilan sampel tanah tidak terganggu, uji tes pit, analisis sifat petrologi atau batuan. Kondisi Geologi daerah ini terdiri dari produk vulkanik muda yang tidak terpisahhkan, yang terdiri dari breksi tufan, tuf, lahar, tuf lapilli, dan abu vulkanik yang berumur kuarter (kurang dari 2 Ma). Kondisi geomorfologi daerah ini terdiri dari dataran hingga perbukitan landai di selatan Gn. Manglayang. Berdasarkan hasil penelitian, kawasan Jatinangor memiliki distribusi tanah terdiri dari lanau hingga lempung berplastisitas tinggi (MH dan CH). Kondisi ini menyiratkan produk vulkanik yang tidak terkonsolidasi dan tanah residu semi-konsolidasi sebagai produk pelapukan dari ash dan alterasi dari tuff. Kata Kunci: Jatinangor, Sifat Fisik Tanah, Tuff, Material Vulkanik Muda belum Terpisahkan ABSTRACTThe development of jatinangor area in recent time has experienced a very rapid development. Jatinangor is the new location for Education area from several campuses such as Unpad, ITB, IKOPIN, and IPDN. This results in an increase in the number of population each year and also led to a growing development of infrastructure to support educational activities in this area. To know the obstacles and avoid the occurrence of natural disasters in the future, it should be understood the behavior of surface soil as the building foundation of various infrastructure facilities. The research method includes engineering geologic mapping, undisturbed soil sampling, test pit, petrologic or rock properties analysis. The geology of this area consists of undifferentiated young volcanic product (Qyu), containing tuffaceous breccia, tuff, lava, lapilli tuff, and volcanic ash. This product is deposited on Quaternary geologic age (less than 2 Ma). The geomorphology of this area consists of plain to hilly land at the south of Mount Manglayang. Result of this study shows that around Jatinangor area the distribution of soils consists of high plasticity silt and clay (MH and CH). This condition implies to semiconsolidated-nonconsolidated volcanic product and semi-consolidated residual soil as the weathering product of ash and tuff alterations. Keywords: Jatinangor, physical properties soil, tuff, undifferentiated young volcanic product

Aktivitas Tanah Lempung Pada Formasi Bojongmanik Terhadap Kestabilan Lereng di Daerah Cikopomayak, Kabupaten Bogor, Provinsi Jawa Barat Alifahmi, Alifahmi; Sophian, Raden Irvan; Muslim, Dicky
Bulletin of Scientific Contribution Vol 14, No 3 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Formasi Bojongmanik merupakan formasi yang salah satu material penyusunya merupakan batulempung. Berdasarkan pemetaan geologi teknik yang telah dilakukan daerah penelitian memiliki jenis tanah lempung berplastisitas tinggi (CH) dan lanau berplastisitas tinggi (MH) menurut klasifikasi USCS (Unified Soil Clasification System). Kondisi tanah dengan plastisitas tinggi merupakan kondisi dimana tanah dapat merubah bentuk dengan mudah akibat adanya pengaruh kenaikan kandungan air. Aktivitas mineral lempung merupakan salah satu faktor yang mengatur kestabilan lereng, dimana tanah lempung memiliki sifat dapat menyusut dan mengembang bergantung pada kadar air. Berdasarkan nilai aktivitas lempung yang diperoleh pada daerah penelitian dengan membandingkan nilai indeks plastisitas terhadap presentase kandungan lempung didapat pada lapisan bagian atas tanah (kedalaman 0.5-1m) memiliki nilai aktivitas lempung yang tinggi (>125) dengan jenis lempung Montmorilonite dan lapisan tanah bagian bawah (kedalaman 2-4m) memiliki nilai aktivitas lempung rendah (<0.75) dengan jenis mineral kaolinite hingga aktivitas lempung normal (0.75-1.25) dengan jenis mineral illite. Meskipun nilai safety factor pada daerah penelitian lebih besar dari angka stabil yang dinyatakan oleh Bowles, yaitu diatas 1.25, bahaya longsor masih memungkinkan terjadi pada saat tanah berada dalam kondisi basah, hal ini dikarenakan kandungan air dalam lempung meningkat memicu kenaikan aktivitas lempung sehingga menyebabkan kenaikan volume pada lempung. Pada peristiwa tersebut kondisi lereng akan mengalami ketidak stabilan sehingga pergerakan massa tanah terjadi untuk mencapai titik setimbang lereng tersebut. Kata kunci: kestabilan lereng, safety factor, mineral lempung, longsor

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