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| Abstract |
Indonesia is known for its abundant coal reserve. However, weak ge-ological condition of the rock is one of the most common challenges in Indonesia coal mining. The study area of this research is PT G...erbang Daya Mandiri (GDM) mine which is situated in East Kalimantan. Stratigraphy of this area comprises of claystone as dominant rock and the present of multiple coal seams with the thick-ness ranging from 0.15m to 9.8m. In this mine, longwall mining is adopted for coal seam extraction. Recently, GDM had begun their development of trial panel for depth around 100m to 150m to understand the behavior of the rock for the real longwall operation. Physically, for this trial study depth, claystone is weaker than coal. Thus, by leaving part of coal seam on top and bottom of the excavated entry-gate would help to retain its stability. This paper will use numerical simu-lation by FLAC3D to investigate the optimum remain coal thickness (RCT) for stability of the entry-gate of trial panel and to identify appropriate roof support. Model simulation is verified using displacement data from extensometer. The outcome results show that the optimum RCT is 1m on roof and 1.5m on the floor. SS540 with 0.5m spacing is appropriated for adopting for this trial panel. The recommended additional support during longwall operation are 5m, 9m, and 25m for 100m, 125m, and 150m coal seam depth respectively.show more
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