综采沿空巷道非等强度耦合支护动态特性研究

    Study on dynamic characteristics of unequal strength coupling support in fully mechanized gob-side entry

    • 摘要: 煤矿井下工作面开采扰动对于综采沿空巷道超前支护的影响显著,因此,基于FLAC3D软件建立数值模型,输入符合采煤机开采扰动的应力波模拟工作面开采,解算横纵向联合非等强度耦合支护策略下顶板采空区侧与实体煤侧监测点数值仿真结果,从位移、应力两个方面的动态响应进行对比分析,研究结果表明:工作面开采扰动所形成的应力波随着距离增加而减弱,在距离工作面端20 m左右工作面开采扰动影响较低,采空区侧监测点垂直方向位移、应力变化更大,实体煤侧监测点水平方向位移、应力变化更大,波动处于合理范围内,验证了横纵向联合非等强度耦合支护策略控制工作面开采扰动工况下巷道顶板的可行性。研究结果可为开采扰动情况下沿空巷道稳定控制提供参考。

       

      Abstract: The mining disturbance of underground working face in coal mine has a significant influence on the advance support of fully mechanized gob-side entry. Therefore, a numerical model is established based on FLAC3D software, and the stress wave conforming to the mining disturbance of shearer is input to simulate the mining of working face. The numerical simulation results of monitoring points on the goaf side and the solid coal side of the roof under the coupling support strategy of horizontal and vertical combined unequal strength are solved. The dynamic responses of displacement and stress are compared and analyzed. The results show that the stress wave formed by the mining disturbance of working face decreases with the increase of distance, and the mining disturbance of working face is less affected at about 20 m from the end of working face. The vertical displacement and stress of the monitoring points on the goaf side change more, and the horizontal displacement and stress of the monitoring points on the solid coal side change more, and the fluctuation is within a reasonable range, which verifies the feasibility of the horizontal and vertical combined unequal strength coupling support strategy to control the roadway roof under the mining disturbance condition of the working face. The research results can provide reference for the stability control of gob-side entry under mining disturbance.

       

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