上覆采空区对掘进巷道围岩应力场影响规律研究

    Study on the influence law of overlying goaf on the surrounding rock stress field of excavation roadway

    • 摘要: 煤矿深部多煤层开采现象非常普遍,其中,上覆煤层开采对下部煤岩体的应力扰动最为复杂,这也是引起采掘工作面复合动力灾害的关键因素之一。本研究以平煤股份六矿上覆工作面采空区和下部掘进工作面巷道为依托,运用UDEC软件模拟了上覆采空区对下部掘进工作面风巷围岩应力重分布的影响特征,并与现场三维扰动应力测试数据进行对比分析。研究结果表明:上覆采空区对下部掘进巷道围岩应力影响主要在垂直方向上,而对水平方向应力影响较小;掘进巷道左帮围岩应力随着距离上覆采空区水平距离的增大,呈现先增大后减小的趋势,右帮应力呈逐渐减小至稳定的趋势。数值模拟结果显示,掘进巷道围岩垂直方向应力集中系数最大增至1.52,水平方向侧压力系数最多减至0.93,上覆采空区对下部工作面应力影响范围在水平方向约136 m;现场应力测试结果显示,掘进巷道围岩垂直方向应力集中系数最大增至1.74,水平方向侧压力系数最多减至0.85,采空区对应力影响范围在水平方向约141 m,数值模拟和现场测试总体规律较为吻合。本研究可为多煤层采掘布置及灾害防控提供理论依据。

       

      Abstract: In deep coal mining, multi-seam mining is prevalent. Among various mining-induced effects, the stress disturbance imposed by the overlying coal seams on the underlying coal and rock masses is the most intricate, which also constitutes one of the crucial factors triggering compound dynamic disasters at the mining face. In this research, taking the overlying goaf and the underlying excavation roadway in the No.6 Mine of Pingdingshan Tianan Coal. Mining Co., Ltd., as the study object, the UDEC software is employed to simulate the influence of the overlying goaf on the stress redistribution of the wind roadway in the underlying driving face. A comparative analysis is further conducted with the on-site three-dimensional disturbed stress measurement data. The results indicate that the impact of the overlying goaf on the surrounding rock stress of the underlying driving roadway is primarily manifested in the vertical direction, with a relatively minor impact on the horizontal stress. As the increase of the horizontal distance from the overlying mining area, the stress of the left side of the roadway shows an increasing and then decreasing trend, and the stress of the right side of the roadway shows a gradual decrease to a stable trend. Numerical simulation results show that the vertical stress concentration coefficient of the surrounding rock of the excavation roadway increases to a maximum of 1.52, and the horizontal lateral pressure coefficient decreases to a maximum of 0.93, the horizontal influence range of the overlying goaf on the stress of the underlying driving roadway is approximately 136 m. The field stress test results show that the vertical stress concentration coefficient of the roadway surrounding rock surges to 1.74, and the horizontal lateral pressure coefficient diminishes from 1.40 to 0.85, and the horizontal influence range of the overlying goaf is about 141 m. This study can provide a theoretical foundation for the layout of multi-seam mining and disaster prevention and control.

       

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