水压致裂地应力测量 hydrofracturing in-situ stress measurement ; hydraulic fracturing stress measurement
断层影响30米的范围内为应力陡变区，该范围内冲击地压发生的次数占全部次数的90 %。
The area of 30m which is influenced by fault is a sudden change area in stress, and 90% of all rock burst frequencies take place in this area.
这次微震群属于冲击地压型矿震，与煤矿开采及回采工程活动有关，属于偶发的局部应力释放。
The event is ore earthquake of rock burst type related to coal mine exploitation and mining activity, the micro-earthquake swarms belong to occasional local stress releasing.
讨论了放顶煤开采的采场应力场的分布规律及其对冲击地压的控制作用。
The distribution law of inner stress field and its effect on controlling underground impact pressure are discussed, when sub-level caving method is introduced.
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