DOI: https://doi.org/10.14710/mkts.v31i2.69177

Pengaruh Aktifitas Alat Berat dan Peledakan Terhadap Stabilitas Lereng Timbunan Tambang Batubara

The effect of heavy equipment and blasting activities on the stability of coal mine slopes

*Fanteri Aji Dharma Suparno scopus  -  Department of Mining Engineering, University of Jember, Indonesia
Siti Aminah scopus  -  Department of Mining Engineering, University of Jember, Indonesia
Haeruddin Haeruddin  -  Department of Mining Engineering, University of Jember, Indonesia
Utari Retno Sulistyo Rini  -  Department of Mining Engineering, University of Jember, Indonesia
Kurnia Dewi Mulyani  -  Department of Mining Engineering, University of Jember, Indonesia
Emanuel Grace Manek  -  Department of Mining Engineering, University of Jember, Indonesia
Muhammad Akbar Assyarbini  -  Department of Mining Engineering, University of Jember, Indonesia

Citation Format:
Abstract

Open-pit mining generates voids backfilled with overburden, forming artificial slopes susceptible to landslides.
Improper slope design and external factors such as heavy equipment loads, blasting vibrations, and
groundwater may trigger instability. This study examines the stability of a disposal slope adjacent to the
blasting zone at PT X Coal Mine in East Kalimantan, Indonesia. The research uses secondary data from PT X.
including geotechnical parameters and operational details, Slope stability was evaluated via the Limit
Equilibrium Method (Bishop and Morgenstern-Price) and Finite Element Method (FEM). Initial analyses
revealed critical safety factors (FoS) of 0.853 (Bishop, Morgenstern-Price) and 0.520 (FEM), indicating high
instability under combined dynamic and hydrogeological stresses. A slope redesign was proposed, improving
FoS to 3.932 (dry) and 3.523 (wet) via Limit Equilibrium, and 1.570 (dry) and 1.370 (wet) via FEM. These
value;s comply with the safety threshold (FoS ≥ 1.1) specified in KEPMEN ESDM No. 1827 K/30/MEM/2018,
ensuring operational safety. The study underscores the necessity of integrating geotechnical and operational
constraints in slope design to mitigate landslide risks in open-pit mining.

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Keywords: Open-pit mining; slope stability; limit equilibrium method; inite element method

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