ANALISIS METODE NUMERIK PENGARUH HUJAN TERHADAP KESTABILAN LERENG TUNGGAL TIMBUNAN DI TAMBANG TERBUKA BATUBARA
DOI:
https://doi.org/10.30556/jtmb.Vol21.No1.2025.1599Kata Kunci:
kestabilan lereng, faktor keamanan, hujan, timbunanAbstrak
Indonesia merupakan negara dengan iklim tropis dan memiliki curah hujan yang tinggi terutama di daerah sekitar garis khatulistiwa. Kejadian hujan memengaruhi kestabilan lereng melalui peningkatan tekanan air pori, penurunan tegangan efektif, dan kekuatan geser, yang pada akhirnya menurunkan faktor keamanan serta meningkatkan probabilitas longsor. Belum banyak dilakukan penelitian tentang perubahan tekanan air pori selama proses infiltrasi hujan khususnya di Indonesia. Penelitian ini dilakukan untuk mengetahui pengaruh kejadian hujan terhadap kestabilan lereng tunggal timbunan menggunakan metode numerik dengan pendekatan analisis coupled hydro-mechanical. Simulasi dilakukan dengan pemodelan transient finite element analysis (TFEA) untuk analisis distribusi tekanan air pori selama kejadian hujan. Selain itu, dilakukan pemodelan limit equilibrium method (LEM) untuk mengevaluasi perubahan nilai faktor keamanan lereng. Perangkat lunak Slide2 digunakan pada simulasi skenario variasi curah hujan dan durasi hujan selama 24 jam, dengan total 1.568 kombinasi model. Hasil penelitian menunjukkan bahwa pengaruh kejadian hujan menurunkan nilai faktor keamanan mencapai 31,54%. Hubungan nilai faktor keamanan dan curah hujan dapat direpresentasikan melalui persamaan FK = 2,1607 CH-0,05 dan memberikan korelasi yang baik dengan nilai R2 sebesar 0,9309.
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