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基于上覆岩层空间结构,并且依据3上煤柱两侧不同的采动情况,分析了煤柱上覆岩层分布特征和应力传递规律,估算了其静态平均支承应力大小;其次采用弹性力学方法,分析计算了煤柱下部煤岩应力场函数;最后基于冲击地压发生理论和采掘实践,提出了应力为指标的孤岛煤柱下掘进巷道位置判别公式。通过理论分析、现场矿压观测等手段初步得到3下510运输巷错开煤柱的距离大于5 m,并根据冲击地压防治原则和利于资源回收原则,最终确定了3下510运输巷位置(错开煤柱的距离约7 m)。现场实施效果良好,并且验证了孤岛煤柱下巷道布置方法的合理性。
Based on the spatial structure of the overlying rock strata and the different mining conditions on both sides of the upper coal pillar, the distribution characteristics and stress transfer law of the overlying strata in the coal pillar are analyzed and the static average bearing stress is estimated. Secondly, using the elastic mechanics method, Finally, based on the theory of rockburst and the practice of excavation, the position discrimination formula of driving roadway under the island pillar with stress is put forward. Through theoretical analysis and on-the-spot rock pressure observation, the distance between three lower 510 transport lanes is more than 5 m, which is more than 5 m away from the coal pillar. Based on the principle of rock burst control and resource recovery, Pillar distance of about 7 m). The implementation of the site was effective and the rationality of the method of laneway layout under island pillars was verified.