Rock burst mechanism and prevention for irregular working face in the area affected by complex fault structure

LIU Chang

doi:10.11799/ce202510011

Abstract：Aiming at the rockburst disaster easily induced by the superposition of strong dynamic and high static loads in working faces with complex geological and mining conditions,the irregular working face 7302 in Zhaolou Coal Mine was taken as the research object.Through on-site sampling and testing,rockburst risk assessment,theoretical analysis,refined numerical simulation,multi-parameter monitoring and early warning,and coordinated control technology for prevention and mitigation,the mechanism and prevention of rockburst induced by mining in irregular working faces within areas influenced by complex fault structures were investigated.The results indicate that:the shear stress required for slip instability is directly proportional to the shear modulus of the fault weak plane.When the failure strength of bonded points on the fault weak plane exhibits high consistency,it leads to an instantaneous stress drop in the form of stick-slip friction,thereby inducing strong mining seismicity.A larger mining width of the working face makes thick,hard key strata at higher positions in the overburden more likely to reach their ultimate breaking span,resulting in strong dynamic loading disturbances.Simultaneously,this increases the concentration and range of static stress in the surrounding rock of the mining space.Refined three-dimensional numerical simulations were used to preliminarily identify potential rockburst risk zones during mining,highlighting that mining activities disturb the Fz14 reverse fault and Fd64 normal fault,leading to their activation.A multi-parameter spatial quantification technology was employed for real-time precursor identification and monitoring during mining,providing timely feedback on the effectiveness of coordinated prevention and control measures.