ANALISIS KESTABILAN LERENG UNTUK OPTIMASI ENDAPAN BATUBARA DI AREA LOWWALL PIT XYZ PT. KIDECO JAYA AGUNG PROVINSI KALIMANTAN TIMUR
ANALISIS KESTABILAN LERENG UNTUK OPTIMASI ENDAPAN BATUBARA DI AREA LOWWALL PIT XYZ PT. KIDECO JAYA AGUNG KECAMATAN BATU SOPANG KABUPATEN PASE PROVINSI KALIMANTAN TIMUR
Abstract
Abstrak
Pit XYZ merupakan salah satu Pit di Pt. Kideco Jaya Agung di mana terdapat area lowwall yang telah mengalami longsoran dan di area tersebut masih memiliki endapan batubara, sehingga akan dilakukan kegiatan optimasi endapan batubara. Dalam kegiatan optimasi endapan batubara perlu dilakukan analisis balik (back analysis) untuk mengetahui nilai parameter geoteknik (kohesi dan sudut gesek dalam) sehingga nilai faktor keamanan pada lereng aktual diketahui dan dapat memberikan rekomendasi desain geometri yang aman dan stabil. Penelitian ini dilakukan menggunakan metode kuantitatif. Dalam pengolahan data, dilakukan analisis balik terhadap tiap penampang. Untuk analisis faktor keamanan dan rekomendasi geometri lereng digunakan metode Morgenstern-Price. Hasil penelitian menunjukkan nilai kestabilan lereng aktual untuk penampang A dengan FK = 1.090 dan penampang B dengan FK = 1.082, setelah mengetahui nilai FK pada lereng aktual maka dibuat desain optimasi pada masing-masing penampang yang memiliki nilai FK = 1.025 dan FK = 1.032. Desain optimasi ini belum memenuhi kriteria sehingga peneliti membuat opsi desain geometri di setiap penampang, penampang A memiliki nilai FK = 1.399 dan penampang B memiliki nilai FK = 1.301.
Kata kunci : faktor keamanan, desain geometri optimum
Abstract
Pit XYZ is one of the Pits at Pt. Kideco Jaya Agung, where there is a lowwall area that has experienced landslides and as the area still has coal deposits, coal sediment optimization will be carried out. In the optimization of coal deposits, it is necessary to do a back analysis to determine the value of geotechnical parameters (cohesion and inner friction angle) so that the value of the safety factor on the actual slope is known and it can provide recommendations for safe and stable geometric designs. This research is conducted using quantitative methods. In the data processing, a back analysis is performed on each section. The analysis of safety factors and recommendations for slope geometry is carried out using the Morgenstern-Price method. The results show the actual slope stability value for section A with FK = 1,090 and section B with FK = 1,082. After obtaining the FK and PK values on the actual slopes, an optimization design was made for each section with FK = 1,025 and FK = 1,032 for section A and B respectively. This optimization design does not meet the criteria so the researcher makes geometric design options for each section, section A has a value of FK = 1.399% and section B has a value of FK = 1.301.
Key words: safety factor, optimum geometric design
Abstrak
Pit XYZ merupakan salah satu Pit di Pt. Kideco Jaya Agung di mana terdapat area lowwall yang telah mengalami longsoran dan di area tersebut masih memiliki endapan batubara, sehingga akan dilakukan kegiatan optimasi endapan batubara. Dalam kegiatan optimasi endapan batubara perlu dilakukan analisis balik (back analysis) untuk mengetahui nilai parameter geoteknik (kohesi dan sudut gesek dalam) sehingga nilai faktor keamanan pada lereng aktual diketahui dan dapat memberikan rekomendasi desain geometri yang aman dan stabil. Penelitian ini dilakukan menggunakan metode kuantitatif. Dalam pengolahan data, dilakukan analisis balik terhadap tiap penampang. Untuk analisis faktor keamanan dan rekomendasi geometri lereng digunakan metode Morgenstern-Price. Hasil penelitian menunjukkan nilai kestabilan lereng aktual untuk penampang A dengan FK = 1.090 dan penampang B dengan FK = 1.082, setelah mengetahui nilai FK pada lereng aktual maka dibuat desain optimasi pada masing-masing penampang yang memiliki nilai FK = 1.025 dan FK = 1.032. Desain optimasi ini belum memenuhi kriteria sehingga peneliti membuat opsi desain geometri di setiap penampang, penampang A memiliki nilai FK = 1.399 dan penampang B memiliki nilai FK = 1.301.
Kata kunci : faktor keamanan, desain geometri optimum
Abstract
Pit XYZ is one of the Pits at Pt. Kideco Jaya Agung, where there is a lowwall area that has experienced landslides and as the area still has coal deposits, coal sediment optimization will be carried out. In the optimization of coal deposits, it is necessary to do a back analysis to determine the value of geotechnical parameters (cohesion and inner friction angle) so that the value of the safety factor on the actual slope is known and it can provide recommendations for safe and stable geometric designs. This research is conducted using quantitative methods. In the data processing, a back analysis is performed on each section. The analysis of safety factors and recommendations for slope geometry is carried out using the Morgenstern-Price method. The results show the actual slope stability value for section A with FK = 1,090 and section B with FK = 1,082. After obtaining the FK and PK values on the actual slopes, an optimization design was made for each section with FK = 1,025 and FK = 1,032 for section A and B respectively. This optimization design does not meet the criteria so the researcher makes geometric design options for each section, section A has a value of FK = 1.399% and section B has a value of FK = 1.301.
Key words: safety factor, optimum geometric design
This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.
All articles published Open Access will be immediately and permanently free for everyone to read and download. We are continuously working with our author communities to select the best choice of license options, currently being defined for this journal as follows:
• Creative Commons Attribution-ShareAlike (CC BY-SA)
