Analisis kestabilan lereng menggunakan metode kesetimbangan batas dan probabilistik di TK. 4488 PT Timah Tbk Desa Air Lelay Darat Kabupaten Bangka Selatan

Pratama Aditya Irawan, (NIM. 1031711053) (2022) Analisis kestabilan lereng menggunakan metode kesetimbangan batas dan probabilistik di TK. 4488 PT Timah Tbk Desa Air Lelay Darat Kabupaten Bangka Selatan. skripsi thesis, Universitas Bangka Belitung.

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Abstract

Tambang Kecil (TK). 4488 Desa Air Lelay Darat adalah salah satu tambang alluvial yang berada di dalam IUP PT Timah Tbk dan terletak di Kabupaten Bangka Selatan, Kepulauan Bangka Belitung. Tambang ini dulunya merupakan bekas tambang, seiring dengan harga timah yang semakin baik maka dikerjakan kembali oleh mitra PT Timah Tbk dengan kondisi material lepas/loose yang rentan terjadi kelongsoran, terutama saat musim penghujan tiba. Penelitian ini dilakukan untuk menganalisis kondisi kestabilan lereng melalui pengujian sifat fisik dan mekanik menggunakan metode kesetimbangan batas dan probabilistik simulasi Monte Carlo. Berdasarkan hasil pengamatan satuan lapisan penyusun lereng terdiri atas satuan, Pasir Lanauan, Pasir Bergradasi Jelek, Pasir Bergradasi Baik, Pasir Bergradasi Buruk dengan Kerikil dan Lempung, Pasir Bergradasi Baik dengan Kerikil dan Lempung, Pasir Bergradasi Baik dengan Lempung. Sedangkan pada analisis kestabilan lereng keseluruhan baik kondisi statis maupun dinamis pada penampang A–A’ FK deterministik 1,307, PK 4,600% dan FK rata–rata 1,317 pada kondisi statis. FK deterministik 1,065, PK 20,200% dan FK rata–rata 1,074 pada kondisi dinamis. Penampang B–B’ FK deterministik 2,979, PK 0% dan FK rata–rata 2,987 pada kondisi statis. FK deterministik 1,803, PK 0% dan FK rata–rata 1,805 pada kondisi dinamis. Penampang C–C’ FK deterministik 2,393, PK 0% dan FK rata-rata 2,353 pada kondisi statis. FK deterministik 1,065, PK 22,100% dan FK rata–rata 1,067 pada kondisi dinamis, dengan beban seismik horizontal sebesar 0,056 g dan beban 201,04 pada masing masing penampang lereng. Dilakukan optimasi pada penampang lereng A–A’ dan penampang lereng C–C’ pada kondisi dinamis, FK deterministik 1,233, PK 0,400% dan FK rata–rata 1,238 pada penampang lereng A–A’. Sedangkan pada penampang lereng C–C’ FK deterministik 1,269, PK 0,200% dan FK rata–rata 1,274. Kata kunci: Faktor Keamanan, Kestabilan Lereng, Probabilitas Kelongsoran. Small mine 4488 Air Lelay Darat Village is one of the alluvial under the business license of PT Timah Tbk and is located in South Bangka Regency, Bangka Belitung Islands. This mine used to be a former mine, along with the price of tin getting better, it was reworked by PT Timah Tbk's partners with loose material conditions are prone to landslides, especially during the rainy season. This research was conducted to analyze the condition of slope stability through testing of physical and mechanical properties using the limit equilibrium method and probabilistic Monte Carlo simulation. Based on the results of observations, the units of the layers making up the slopes consist of units, Silt Sand, Poorly Graded Sand, Well Graded Sand, Poorly Graded Sand with Gravel and Clay, Well Graded Sand with Gravel and Clay, Well Graded Sand with Clay. Meanwhile, in the overall slope stability analysis, both static and dynamic conditions on the A–A' cross section, the deterministic SF 1,307, PF 4,600% and the average SF 1,317 in static conditions. Deterministic SF 1,065, PF 20,200% and average SF 1,074 in dynamic conditions. The cross section B–B' a deterministic SF 2,979, PF 0% and an average SF 2,987 under static conditions. Deterministic SF 1,803, PF 0% and average SF 1,805 in dynamic conditions. The cross section of C–C' a deterministic SF 2,393, PF 0% and an average SF 2,353 under static conditions. The deterministic SF 1,065, the PF 22,100% and the average SF 1,067 under dynamic conditions, with a horizontal seismic load of 0,056 g and a load of 201,04 kN/m on each cross section of the slope. Necessary to optimize the cross-section of the slope A–A' and the cross section of the slope C–C' under dynamic conditions. the deterministic SF 1,233, the PF 0,400% and the average SF 1,238 on the slope section A–A'. While on the cross section of the slopes C–C' a deterministic SF 1,269, PF 0,200% and an average SF 1,274. Keywords: Safety Factor, Slope Stability, Probability Failure.

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