Numerical modelling of rock cross-cut coal uncovering based on ANSYS
G Wang1,2, H Y Wang1,2, Q M Huang2, C Q Su3
COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(3) 26-32
1 State Key Laboratory of Ministry of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, Shandong, China, 266590
2 College of Resources and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong, China, 266590
3 Lindong Mining Group Co. Ltd., Guiyang, Guizhou, China, 550056
Outbursts of coal and gas could be induced by rock cross-cut coal uncovering. ANSYS is used to numerically simulate the stress, strain and energy of surrounding rock of roadway during the process of rock cross-cut coal uncovering. Modelling results show that there is a banding tension stress zone in roof and floor of roadway after excavation. Principal and shear stress concentration are formed in the upper and under area of the anterior heading face, which is symmetrically distributed between medial axis of roadway, while stress, strain and strain energy of overlying strata above the coal seam approximately keep invariant. The occurrence of the stress concentration in upper area of the anterior heading face could contribute to the instability and failure of coal and rock mass. The area with weak destruction-resisting ability is the most easily to be the releasing port of outburst and should be regarded as the key region in outburst prevention.