临近断层构造带不规则工作面开采诱冲机制研究

Mechanism of mining induced rockburst in irregular working faces near fault

针对临近断层构造带不规则工作面开采期间容易诱发严重冲击地压显现难题,通过现场调研、理论分析、数值模拟和矿压观测相结合的方法,对7447不规则工作面回采期间覆岩破断特征及其诱冲机制进行了研究。结果表明:在静载作用下宽工作面段较窄工作面段的巷道更容易发生破坏,且临近断层构造带侧的运输平巷相较于轨道平巷更容易发生变形破坏;宽工作面段较窄工作面段更易在采空区上方形成破坏高度更大的梯形体结构,此时覆岩中厚硬关键层发生破断而形成剧烈动载扰动。现场支架工作阻力随工作面回采推进距离变化规律进一步揭示了不规则工作面开采诱冲机制,为具有类似工程背景的冲击地压研究奠定了基础。

In order to solve the problem of serious rockburst induced during the mining of irregular working face near the fault zone,we studied the fracture characteristics of the overburden and its rockburst inducing mechanism during the mining of 7447 irregular working face by means of field investigation,theoretical analysis,numerical simulation and mine pressure observation.The results indicate that under static load,the roadway with a wide working face is more prone to damage than the narrow working face,and the transportation roadway near the fault structural belt is more prone to deformation and damage compared to the narrow roadway;the wide working face section is more likely to form a trapezoidal structure with a higher failure height above the goaf compared to the narrow working face section.At this time,the thick and hard key layer of the overlying rock breaks and forms severe dynamic load disturbance.The variation law of the working resistance of the support with the mining advance distance of the working face further reveals the mechanism of mining induced rockburst in the irregular working face,which lays a foundation for the study of rock burst with similar engineering background.