Research of roof control and design of surrounding rock support in #9 coal gateway of Wuda Coal Mine district

In this paper, the authors simulated the dynamic process of rock deformation and failure in the roadways. of the #9 coal seam, Wuhushan Coal Mine by using the software "Rock Failure Process Analysis System (RFPA)"([1]). Based on the simulation results, this paper analyzes the failure process, characteristics and weighting of the overburden as the long-wall retreat mining proceeds. We analyzed and studied the roadway's behaviors including deformation characteristics, failure mechanisms, stress distribution in the surrounding rocks and the effects of various support systems on roadway stability. While simulating the rock failure process with RFPA, the model stresses can be obtained through two approaches: (1) the stress is reflected by the grayscale of pictures in the model failure process and (2) the model stress can be obtained by muti-element information, which is one of the commands in RFPA system. Data files of stress can automatically be created, and curves of stress and displacement of each element can be displayed in each step of computation.