Rahmatullah, Alkhodri (2024) ANALISIS DEFORMASI LERENG YANG MENGALAMI LONGSOR MENGGUNAKAN SLOPE STABILITY RADAR (SSR) PADA PIT 2 BLOK BANKO BARAT PT BUKIT ASAM TBK, KABUPATEN MUARA ENIM, PROVINSI SUMATRA SELATAN. S1 thesis, Universitas Jambi.
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Abstract
Salah satu perusahaan pertambangan di Indonesia yang mengelola dan memproduksi batubara ialah PT Bukit Asam Tbk yang berlokasi di Kabupaten Muara Enim, Provinsi Sumatra Selatan. Kegiatan penambangan yang dilakukan secara terus-menerus dapat menyebabkan terganggunya kestabilan pada lereng tambang, sehingga perlu dilakukan analisis terhadap deformasi lereng agar menghindari bahaya longsor yang dapat terjadi. Selama periode pemantauan dari tahun 2022 hingga tahun 2023 terdapat tujuh kejadian longsor yang tercatat pada pit 2, baik pada highwall maupun pada lowwall. Penelitian ini bertujuan untuk menentukan perilaku deformasi lereng selama terjadi longsor, penetapan ambang batas kecepatan longsor serta analisis deformasi lereng sebelum longsor. Dari hasil penelitian didapatkan bahwa perilaku deformasi lereng selama terjadinya longsor pada highwall didapatkan nilai rata-rata kecepatan maksimum di kondisi regresif sebesar 10,94 mm/jam, kondisi progresif sebesar 27,18 mm/jam, kondisi longsor sebesar 26,13 mm/jam dan kondisi setelah longsor sebesar 19,85 mm/jam. Pada lowwall didapatkan nilai rata-rata kecepatan maksimum di kondisi regresif sebesar 3,85 mm/jam, kondisi progresif sebesar 24,35 mm/jam, kondisi longsor sebesar 32,42 mm/jam dan kondisi setelah longsor sebesar 5,02 mm/jam. Kemudian nilai ambang batas kecepatan pergerakan lereng pada highwall dengan rata-rata nilai LCL sebesar -0,65 mm/jam, nilai UCL sebesar 4,45 mm/jam dan critical value sebesar 18,23 mm/jam. Pada lowwall dengan rata-rata nilai LCL sebesar -0,32 mm/jam, nilai UCL sebesar 3,02 mm/jam dan critical value sebesar 18,60 mm/jam. Hasil perhitungan analisis deformasi lereng pada highwall didapatkan rata-rata deformasi maksimum lereng sebesar 10,63 meter dengan penurunan kekuatan massa batuan SRF = 1,07. Sementara itu, pada lowwall didapatkan rata-rata deformasi maksimum lereng sebesar 23,17 meter dengan penurunan kekuatan massa batuan SRF = 0,03. One of the mining companies in Indonesia that manages and produces coal is PT Bukit Asam Tbk located in Muara Enim Regency, South Sumatra Province. Mining activities that are carried out continuously can cause disruption to the stability of the mine slope, so it is necessary to analyse the slope deformation to avoid the danger of landslides that can occur. During the monitoring period from 2022 to 2023, there were seven landslides recorded on pit 2, both on the highwall and on the lowwall. This study aims to determine the behaviour of slope deformation during landslides, setting landslide speed thresholds and analysing slope deformation before landslides. From the results of the study, it was found that the slope deformation behaviour during the landslide on the highwall obtained the average maximum speed value in regressive conditions of 10.94 mm/hour, progressive conditions of 27.18 mm/hour, landslide conditions of 26.13 mm/hour and conditions after landslides of 19.85 mm/hour. In the lowwall, the average maximum speed value in regressive conditions was 3.85 mm/hour, progressive conditions were 24.35 mm/hour, landslide conditions were 32.42 mm/hour and conditions after landslides were 5.02 mm/hour. Then the threshold value of slope movement speed on the highwall with an average LCL value of -0.65 mm/hour, UCL value of 4.45 mm/hour and critical value of 18.23 mm/hour. On the lowwall with an average LCL value of -0.32 mm/hour, UCL value of 3.02 mm/hour and critical value of 18.60 mm/hour. The calculation results of slope deformation analysis on the highwall obtained an average maximum slope deformation of 10.63 meters with a decrease in the strength of the rock mass SRF= 1.07. Meanwhile, the lowwall obtained an average maximum slope deformation of 23.17 meters with a decrease in the strength of the rock mass SRF= 0.03.
| Type: | Thesis (S1) |
|---|---|
| Uncontrolled Keywords: | Pemantauan SSR, Perilaku Deformasi Lereng, Ambang Batas Kecepatan Longsor, Deformasi Lereng |
| Subjects: | L Education > L Education (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TN Mining engineering. Metallurgy |
| Divisions: | Fakultas Sains dan Teknologi > Teknik Pertambangan |
| Depositing User: | rahmatullah |
| Date Deposited: | 13 Jun 2024 04:25 |
| Last Modified: | 13 Jun 2024 04:25 |
| URI: | https://repository.unja.ac.id/id/eprint/65165 |
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