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Research on the Failure Mechanism of Water-Resisting Floor Affected by Fault

HUANG Cun-han1,FENG Tao2,WANG Wei-jun2,LIU Hui2(1.School of Resource and Safety Engineering,Central South University,Changsha,Hunan 410083,China;2.School of Energy and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China)  
According to the limit equilibrium condition of rock's shear failure,we deduce the formula of critical water pressure to study the effect of fault on the stability of water-resisting floor and propose the water-inrush criterion.Based on the deduced formula,we analyze the effect laws caused by the dip angle,the cohesion force of fault,and the width of fault pillar.The main results are as follows: 1) the smaller the dip angle of fault is,the lower the bearing ability of the water-resisting floor will be,thus the water-inrush of floor will happen more easily;2) the smaller the cohesion force of fault is,namely the weaker the strength of the fault is,the less the critical water pressure of the floor will be,and the greater the probability of the water-inrush becomes;and 3) the larger the fault pillar is,the more difficultly the water-inrush will happen.The engineering application shows that the reserved fault pillar is small,so it is quite possible to have the water-inrush.For the safety mining,the reasonable width of fault pillar should be 34.3 m according to the calculation with the deduced formula.
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