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针对水平分段开采造成的持续性扰动作用运用数值模拟的方法进行分析,揭示本分段开采后和下分层开采后模型整体的塑性区、应力场和位移场分布特征,并重点分析了下分段巷道的围岩应力分布特点,最后通过现场监测分析掌握了实际开采过程中开采扰动的影响特点。结果表明:急倾斜水平分段工作面中,随着分段高度的加大上分段开采对下分段的影响逐渐减弱,下分段较大厚度的煤体起到了缓冲作用;下分段底板侧+518 m水平巷道(B3巷)岩石侧承受的压力较大,顶板侧即+518 m水平B6巷道岩石侧承受的压力较大,上分段开采对下分段的超前影响距离是10~20 m,下分段巷道受到开采扰动和采空区覆层介质垮落的影响,锚杆拉力变化滞后于工作面。
For the continuous disturbance caused by horizontal section mining, numerical simulation is used to analyze the characteristics of the plastic zone, stress field and displacement field of the model after the mining in this section and the lower stratified mining, The stress distribution characteristics of the surrounding rock in the sub-roadway are analyzed. Finally, the influence characteristics of the mining disturbance in the actual mining process are mastered through on-site monitoring and analysis. The results show that the influence of sub-section mining on the sub-section gradually diminishes with the increase of sub-section height, and the sub-section larger-thickness coal body plays a buffer role. In the sub-section The pressure on the rock side of the +518 m horizontal roadway (B3 lane) on the floor side is relatively high, and the pressure on the rock side of the B6 roadway on the roof side is +518 m. The upper impact on the sub-section is 10 ~ 20 m, under the influence of sub-section roadway mining disturbances and caving medium caving medium, the tensile force of the anchor lags behind the working face.