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在承压松散含水层下采煤时,由于含水层可传递上覆表土层的载荷,导致该条件下覆岩关键层易形成复合破断,极易发生压架、突水事故.为了避免发生压架及突水事故,提高支架的工作阻力是主要手段之一,但目前对于如何合理确定关键层复合破断条件下的工作阻力则显得研究不足.为此,结合祁东煤矿7_114工作面的实际条件,依据岩层控制理论,采用理论分析对该条件下的支架合理工作阻力进行了研究,提出了关键层复合破断后使“砌体梁”结构不发生滑落失稳的支架工作阻力的计算方法.研究结果表明:当支架工作阻力提高至10 MN时可保证此面不发生压架突水事故.该结论得到了数值模拟的验证.
When coal mining under unconsolidated unconsolidated aquifer, as the aquifer can transmit the load of the overlying overburden, the key strata of overlying strata may easily form composite fracture under this condition, which is prone to pressure racking and water inrush accidents. In order to avoid the occurrence of pressure However, there is a lack of research on how to reasonably determine the working resistance under the condition of the composite fracture of the key layer.Therefore, in combination with the actual conditions of the 7_114 face in Qidong Coal Mine According to the stratum control theory, the reasonable working resistance of the scaffold under this condition was studied by theoretical analysis. The calculation method of the working resistance of the scaffolding that the “masonry beam” structure did not slip down after the key stratum was broken was put forward The results show that when the work support resistance increases to 10 MN, it can ensure that there is no accident of ram water inrush on this surface.This conclusion is validated by numerical simulation.