三维效应下内排追踪距离对边坡稳定的影响
Influence of inner row tracking distance on slope stability under 3D effect
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摘要: 为保障露天矿边坡安全，提高露天煤矿资源采出率，根据边坡变形破坏机理及影响条件，对露天矿横采内排过程中，采场形态对露天矿边坡稳定性的影响进行研究；以巴基斯坦塔尔煤田为研究对象，通过FLAC3D分析边坡变形破坏机理，明确滑坡模式，对横采内排追踪距离进行分析，为煤矿边坡优化提供参考依据。结果表明：边坡破坏类型属于张拉-剪切复合型，受到采场工作帮与内排土场的双重支档作用，边坡稳定性整体增大；当内排追踪距离为50~100 m时，边坡三维空间效应显著，稳定性较高；随着追踪距离增大，稳定性越来越差。Abstract: In order to improve the recovery rate of open-pit coal mine resources, under the condition of studying the deformation and failure mechanism of the slope, the horizontal mining is carried out and the stope shape is optimized. Taking the Thar coalfield in Pakistan as the research object, the paper firstly analyzes the deformation and failure mechanism of the slope through FLAC3D, clarifies the landslide mode, and then analyzes the tracking distance of the horizontal mining and inner row, and finally provides a reference for the optimization of the coal mine. The results show that the failure type of the slope belongs to the tension-shear composite type, and the stability of the slope increases as a whole due to the double support effect of the slope working aid and the inner dump. When the tracking distance of the inner row is 50 m to 100 m, the three-dimensional spatial effect of the slope is significant, and the stability is high; as the tracking distance increases, the stability becomes worse and worse.
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