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ANALISIS BALIK KESTABILAN LERENG STUDI KASUS TAMBANG BATUBARA PT.X MENGGUNAKAN ANALISIS PROBABILISTIK MONTE CARLO Andhini, Dhini; Ramadhanti, Fitra; Koesnaryo, S.
Prosiding Seminar Teknologi Kebumian dan Kelautan Vol 1, No 1 (2019)
Publisher : Prosiding Seminar Teknologi Kebumian dan Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1955.354 KB)

Abstract

PT. X merupakan perusahaan tambang batubara dimana penambangan dilakukan dengan metode Open Pit Mining. Studi geoteknik telah dilakukan pada 3 tahun sebelumnya, tetapi pada kondisi aktual terkini area lowwall Panel A terjadi longsoran dikarenakan geometri lowwall tidak mengikuti rekomendasi kajian geoteknik, hal ini terjadi karena apabila geometri lereng mengikuti kajian geoteknik maka akan mengakibatkan nilai stripping ratio yang besar. Pemodelan dan analisis kemantapan lereng menggunakan pemodelan metode Kesetimbangan Batas (Limit Equilibrium Method) dengan analisis probabilistik Monte Carlo. Permodelan dilakukan dengan menggunakan bantuan perangkat lunak  software    ata kondisi awal dari area panel   yaitu pada lapisan sandstone dengan kohesi  c        kN m dan sudut gesek dalam               siltstone: c        kN m             claystone  c       kN m dan           Analisis faktor keamanan (FK) dan rekomendasi geometri lereng menggunakan metode Simplified Janbu dan metode Simplified Bishop. Hasil dari kedua metode analisis digunakan nilai dari metode Simplified janbu karena memiliki nilai yang rendah dari metode Simplified Bishop sehingga nilai dari faktor keamanan dapat dilihat dari kemungkinan terburuk yaitu, longsoran area lowwall Panel A merupakan longsoran bidang dikarenakan kondisi lereng tidak stabil serta adanya bidang perlapisan yang lemah  dimana  K longsoran       dengan kemiringan       ebelum kelongsoran  K       dengan kemiringan      Parameter geoteknik dari analisis balik longsoran adalah claystone  c        kN m  dan             siltstone: c        kN m dan           sandstone  c        kN m dan            adapun rekomendasi kajian geoteknik dimana  K       yaitu dengan kemiringan lereng      PT. X is a coal mining company where mining is carried out using the Open Pit Mining method. Geotechnical studies have been carried out in the previous 3 years, but in actual conditions previously reported lowwall panel A avalanches occur because the lowwall geometry is not reviewed by geotechnical review, this occurs because it is reviewed by geometry, geotechnical exploration, then there will be a large stripping ratio value. Modeling and analysis of slope stability using the Limit Equilibrium Method with the Monte arlo probabilistic analysis Modeling is done using software he initial condition data from the panel area were in the sandstones with cohesion c kN m and friction angle siltstone: c '= 28.8 kN / m, claystone c kN m and Safety factor analysis (FK) and slope geometry approval using the Simplified Janbu method and the Simplified Bishop method. The results of the two methods of analysis used the value of the Simple janbu method because it has a low value from the imple ishop method to ensure the value of the safety factor can be seen from the worst problem Panel s lowwall landslide area weak field landslide where K landslide with a slope of efore the landslide K with a slope of he geotechnical parameters of the landslide reverse analysis are claystone c kN m and siltstone c kN m and sandstone c kN m and as for the geotechnical discussion where K is with a slope of 
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%.