Evaluation of Water Inrush from Floor Containing Insidious Fault Based on Crack Growth
HU Xinyu1,2, WANG Lianguo1,2, LU Yinlong2, YU Mei1
1. College of Mechanics and Civil Engeneering, China University of Mining & Technology, Xuzhou 221116, China;
2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221008, China
Abstract:For analyzing the security of floor containing insidious fault while mining above water, a fracture mechanical model is established in order to describe the activation and growth of insidious fault. First, from the beginning of aquifer top in floor, the above part of insidious fault is modeled as an oblique edge crack of finite width plate. Second, involving the effects of normal stress and shear stress for fault activation, effective shear stress distribution in the fault plane is calculated in the mining conditions. Third, according to attitude and burial depth in the floor of fault, distance of face advancing, water pressure of the aquifer, and angle of friction in the fault plane, the compress-shearing stress intensity factor of insidious fault is presented. Finally, the safety index is defined for establishing the criterion of water inrush. Taking a certain coal face mining under pressure for example, in accordance with its hydrologic and geological data, variation of risk about water inrush from activating fault is obtained during the whole face advancing across the fault. The conclusion coincides with microseismic monitoring data at the site. This analysis may provide suggestions for safe and rational coal mining and improve numerical or theoretical models of water inrush in floor.
胡新宇, 王连国, 陆银龙, 喻梅. 基于裂纹扩展的含隐伏断层底板突水评价[J]. 科技导报, 2014, 32(11): 55-59.
HU Xinyu, WANG Lianguo, LU Yinlong, YU Mei. Evaluation of Water Inrush from Floor Containing Insidious Fault Based on Crack Growth. journal1, 2014, 32(11): 55-59.
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