基于高精度微震监测的承压水上底抽巷合理位置研究
Study on Reasonable Location of Top and Bottom Extraction Roadway of Confined Water Based on High Precision Micro-seismic Monitoring
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摘要: 以古汉山矿1604工作面为研究背景,采用高精度微震监测和数值模拟,研究了工作面回采过程中底抽巷围岩动态破坏特征以及底板突水危险性。结果表明:工作面两巷外侧底板岩体在沿空侧与沿实体煤侧出现不对称能量释放现象,其中沿实体煤侧运输巷外侧底板破坏尺度最大,深度约30 m;底抽巷位于底板下12 m、内错运输巷8 m位置时,巷道围岩释放能量密度值介于5~50 J/m2,结合巷道围岩变形监测结果认为底抽巷位于该位置时受开采扰动程度较低;若底抽巷位于运输巷正下方或者外错于运输巷,围岩释放能量密度值均大于100 J/m2,受开采扰动程度高。数值模拟结果表明底抽巷内错回采巷道8 m时处于底板卸压区,位于回采巷道正下方和外错回采巷道时处于应力集中区,受采动影响程度高,与微震监测结果较吻合。Abstract: Taking 1604 working face of Guhanshan Mine as the research background, by means of a high-precision micro-seismic monitoring system and numerical simulation, the dynamic failure characteristics of the surrounding rock and the danger of water inrush from the floor during the mining of the working face are studied. The results show that the asymmetrical energy release phenomenon occurs along the empty side and along the solid coal side of the bottom floor rock mass along the two sides of the working face. Among them, the bottom floor rock mass along the solid coal side has the largest damage scale with a depth of about 30 m. At a position of 12 m under the floor and 8 m in the inner staggered transportation lane, the energy density value of the surrounding rock is between 5-50 J/m2. Combined with the monitoring results of the surrounding rock deformation of the roadway, it is considered that the bottom pumping lane is located at this position and the mining disturbance is lower; the pumping roadway is located directly below the transport roadway or outside the transport roadway. The energy density of the surrounding rock release is greater than 100 J/m2, and the degree of disturbance is high. The numerical simulation results show that the bottom slot is located in the pressure relief area of the floor when the staggered groove is 8 m, which is located directly below the groove and is in the stress concentration area when the staggered groove is outside.
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