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条带开采孤岛煤柱和采空区上覆岩层离层位置的确定是计算孤岛煤柱支承压力以及进行孤岛煤柱可开采性研究的前提。根据孤岛煤柱上覆岩层能否形成离层结构,提出孤岛煤柱支承压力的“有源”和“无源”计算模型,以应力准则和挠度准则判定孤岛煤柱上覆岩层离层位置,进而求得孤岛煤柱所承受地层重力并定义孤岛煤柱整体冲击失稳率,最后结合孤岛煤柱冲击地压发生可能性指数诊断法,对孤岛面的整体冲击失稳危险性和可开采性进行判定。经工程实例验证,该方法是合理可行的。
The determination of the detachment position of the strata mining isolated island coal pillar and the overlying strata of the goaf is the premise of calculating the supporting pressure of the island pillars and the exploitability of the island pillars. According to whether the overlying strata of the overlying pillars can form an ionosphere structure, the “active” and “passive” calculation models of the supporting pressure of the pontoon pillars are proposed. The stress and deflection criteria are used to determine the overlying strata And then get the gravity of the strata to be borne by the island pillars and define the overall impact failure rate of the island pillars. Finally, combined with the possibility index method of the rockburst of the island pillars, the risk of the overall impact on the island surface is instable And exploitability. The engineering example shows that this method is reasonable and feasible.