采动影响下采空区侧向煤体卸压效应研究
Study on pressure relief effect in gob-side coal body under the influence of mining
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摘要: 采用多场耦合数值模拟和现场实测相结合的方法，分析了倾斜煤层开采引起采空区侧向煤体瓦斯卸压效应和消突范围；以红岩煤矿倾斜长壁工作面为研究对象，建立考虑弹塑性损伤的流固耦合模型，模拟采动后围岩的位移和破坏，并分析采空区侧应力集中系数和渗透率的变化；对采动过程中采空区侧10～23 m范围内的瓦斯压力进行了监测并与模拟结果进行对比。模拟结果表明：工作面开采后，采空区一侧将形成破裂穿透、应力集中和初始弹性区，破裂穿透区的瓦斯压力得到有效释放；现场监测结果显示瓦斯压力随着工作面推进呈阶段式下降；对比发现数值模拟结果对预测瓦斯消突带的范围具有指导意义，并最终确定红岩煤矿倾斜长壁工作面突出消除范围为10 m。Abstract: By means of multi-field coupling numerical simulation and field measurement, the pressure relief effect and burst elimination range of side coal gas in goaf caused by inclined coal mining are analyzed. Taking the inclined longwall working face of Hongyan Coal Mine as the research object, a fluid-structure coupling model considering elastic-plastic damage was established to simulate the displacement and failure of surrounding rock after mining, and the changes of lateral stress concentration coefficient and permeability in goaf were analyzed. The gas pressure in the range of 10 m to 23 m in the goaf side was monitored and compared with the simulation results. The simulation results show that fracture penetration, stress concentration and initial elastic zone will form on one side of goaf after mining, and the gas pressure in fracture penetration zone can be effectively released. The field monitoring results show that the gas pressure decreases gradually with the advance of working face. It is found that the numerical simulation results are of guiding significance to predict the scope of gas outburst zone, and the elimination range of the inclined longwall working face of Hongyan Coal Mine is determined to be 10 m.
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