eprintid: 4991 rev_number: 17 eprint_status: archive userid: 343 dir: disk0/00/00/49/91 datestamp: 2024-09-05 06:55:15 lastmod: 2024-09-05 06:55:15 status_changed: 2024-09-05 06:55:15 type: thesis metadata_visibility: show creators_name: MIHARTA, MUHAMMAD YUDHA contributors_type: http://www.loc.gov/loc.terms/relators/THS contributors_type: http://www.loc.gov/loc.terms/relators/THS contributors_name: ., Supandi contributors_name: Wijaya, R. Andy Erwin title: Analisis kestabilan lereng menggunakan metode slope mass rating pada pit 2 penambangan batu andesit di PT. Harmak Indonesia Kecamatan Kokap Kabupaten Kulon Progo Daerah Istimewa Yogyakarta ispublished: unpub subjects: TN divisions: teknik_pertambangan keywords: Kestabilan Lereng, RMR, SMR. = Slope Stability, RMR, SMR. abstract: Penambangan yang dilakukan oleh PT. Harmak Indonesia dapat menimbulkan perubahan lingkungan, seperti timbulnya lereng-lereng baru yang kestabilannya belum diketahui, sehingga menimbulkan kekhawatiran akan bahaya longsor yang dapat membahayakan keselamatan pekerja serta menghambat kegiatan penambangan itu sendiri. Faktor-faktor yang dapat menyebabkan ketidakstabilan lereng meliputi gempa bumi, struktur geologi, peledakan, dan material batuan penyusun lereng. Tujuan dari penelitian ini adalah menganalisis kestabilan lereng berdasarkan nilai Slope Mass Rating (SMR) pada lereng batuan. Metode penelitian ini melibatkan penggunaan sistem klasifikasi Rock Mass Rating (RMR) dan Slope Mass Rating (SMR). RMR adalah sistem klasifikasi yang menilai kualitas massa batuan dengan mempertimbangkan parameter seperti nilai kuat tekan, Rock Quality Designation (RQD), spasi bidang kekar, kondisi bidang kekar, dan kondisi airtanah. Sedangkan SMR adalah sistem klasifikasi yang dirancang khusus untuk lereng batuan dengan menambahkan penyesuaian terhadap orientasi kekar pada nilai RMR. Hasil dari parameter menujukan nilai kuat tekan batuan pembentuk lereng sebesar 51,818 MPa dengan bobot 7, nilai RQD sebesar 99,94% dengan bobot 20, spasi kekar rata-rata 2,78 m dengan bobot 20, kondisi kekar akumulatif dengan bobot 18, dan kondisi air tanah dengan bobot 15. Lereng ini merupakan hasil pembongkaran mekanik dengan bobot 0. Dengan menjumlahkan setiap parameter, diperoleh nilai Slope Mass Rating (SMR) sebesar 71. Hasil penelitian menunjukkan bahwa kondisi batuan pada lereng tergolong normal, stabil pada sebagian besar lereng, dan potensi longsoran berupa blok batuan. Penelitian ini memberikan wawasan penting mengenai kestabilan lereng di lokasi penambangan, yang dapat digunakan untuk merancang langkah-langkah mitigasi yang tepat guna mengurangi risiko longsor dan meningkatkan keselamatan serta efisiensi operasional di area penambangan. = Mining activities conducted by PT. Harmak Indonesia can cause environmental changes, such as the emergence of new slopes with unknown stability, raising concerns about landslide hazards that could endanger worker safety and hinder mining operations. Factors that can cause slope instability include earthquakes, geological structures, blasting, and the material composition of the slopes. The purpose of this study is to analyze slope stability based on the Slope Mass Rating (SMR) value for rock slopes. The research methodology involves the use of the Rock Mass Rating (RMR) and Slope Mass Rating (SMR) classification systems. RMR is a classification system that assesses the quality of the rock mass by considering parameters such as compressive strength, Rock Quality Designation (RQD), joint spacing, joint condition, and groundwater condition. SMR is a classification system specifically designed for rock slopes, incorporating adjustments for joint orientation into the RMR value. The parameter results indicate that the compressive strength of the rock forming the slope is 51.818 MPa with a weight of 7, the RQD value is 99.94% with a weight of 20, the average joint spacing is 2.78 m with a weight of 20, cumulative joint condition with a weight of 18, and groundwater condition with a weight of 15. This slope is a result of mechanical excavation with a weight of 0. By summing each parameter, the Slope Mass Rating (SMR) value is 71. The results of the study show that the rock conditions on the slopes are generally normal, stable on most slopes, and have the potential for block rock slides. This research provides important insights into slope stability at the mining site, which can be used to design appropriate mitigation measures to reduce landslide risks and enhance safety and operational efficiency in the mining area. date: 2024-07 date_type: completed full_text_status: restricted institution: Institut Teknologi Nasional Yogyakarta department: Fakultas Teknik dan Perencanaan : Teknik Pertambangan thesis_type: other thesis_name: other referencetext: Ansyarullah, 2022, Penentuan Kekuatan Massa Batuan Terhadap Perancangan Lereng Penambangan Batuan Andesit Pt. Harmak Indonesia Di Kabupaten Kulonprogo, Yogyakarta Andryan, F., & Yoszi, M.A., 2020, Analisis Kestabilan Lereng pada Blok Timur Tambang Muara Tiga Besar Utara PT. Bukit Asam Tbk, Kabupaten Muara Enim, Provinsi Sumatera Selatan. Bieniawski, Z.T., 1989, Engineering Rock Mass Classification. A Complete Manual for Engineers and Geologist in Mining, Civil, and Petroleum Engineering. New York: John Wiley and Sons. 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