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中文摘要：
以现场同一区域重复发生冲击地压为工程背景,通过理论分析、现场监测、数值模拟等方法研究冲击地压重复发生机理,得出如下结论：1特厚煤层重复冲击区域存在应力恢复现象,而力源作用下的特厚煤层的扩容是导致应力恢复的主要原因;2重复冲击是冲击体受到的冲击力与阻抗力多次搏弈的结果,煤体由完整状态向碎裂状态过渡过程中满足冲击力大于阻抗力的条件而发生多次冲击,直至煤体进入碎裂状态;3通过消除力源、阻止应力恢复可防止冲击地压重复发生。研究结果对防治特厚煤层冲击地压具有重要意义。
英文摘要：
Taking the rock burst recurring in the same region as the engineering background, the mechanism of the repeated rock bursts is explored by using the methods of theoretical analysis, field monitoring and numerical simulation. The results are as follows：（1） The region with repeated rock bursts in extra-thick coal seam has stress restoration phenomenon, and the extra-thick coal seam expands under source of force is the major reason which leads to stress restoration;（2） The repeated impact is the result of competition of many times between the impact force and the impedance force of the impacted body, and rock burst occurs many times during coal body transfers from relatively complete state to fracturing state when the impact force is greater than impedance force, till the coal body fractures completely.（3） Eliminating the force and stopping stress restoration can prevent the recurrence of rock burst. The results of this study may provide a useful reference for the prevention and control of rock bursts in extra-thick coal seam.
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