Roof collapse accidents

potentially in the association with lithology and occurrence of roof terrane etc.

are termed to be one of the most severe calamities in the coal mine exploitation activities. The thickness of weak terrain as one of the most critical elements in roof collapse accidents is discussed in detail here. After carrying out the mechanics analysis for roof failure in coal mines employing rock failure process analysis system (RFPA2D) developed by Northeast University

this paper conducts subsequently the numerical calculation for varying roof failure instances under different weak terrain thicknesses and probes into the impact of weak terrain thicknesses on laneway stability

concluding in the situation of different weak terrain thickness both failure processes after exploiting laneways and shapes formed ultimately by roof collapse. Roof supporting methods for weak terrain in different thicknesses are also listed finally. It is believed that conclusions from this paper are of significant reference not only to construction on site but also for experiments.