新疆南露天矿南帮内排压脚稳定性动态变化规律研究
Study on dynamic variation law of stability of inner dumping pressure foot in the southern slope of Xinjiang South Open-pit Mine
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摘要: 为了探究新疆南露天煤矿内排压脚过程中南帮稳定性变化规律，通过数值模拟结合理论分析手段，对南帮内排压脚过程中边坡稳定性动态变化规律进行了研究；利用FLAC3D强度折减法对南帮内排压脚过程进行了数值模拟分析，得到了内排压脚过程中南帮潜在滑动面位置及稳定性系数的变化规律，确定了南露天矿南帮内排压脚物料截面最优几何参数；基于数值模拟结果建立了南帮内排压脚的极限平衡理论模型，推导出内排压脚过程南帮稳定性系数的计算公式，阐述了南帮内排压脚过程中坡体应力演化规律，揭示了这一过程中南帮潜在滑移面位置变化及稳定性提高的机理。Abstract: In order to explore the stability change law of the south slope during the process of the inner dumping pressure foot in the south open pit coal mine in Xinjiang, this paper studied the dynamic change law of the slope stability during the process of the inner dumping pressure foot in the south open pit coal mine by means of numerical simulation and theoretical analysis. Firstly, the FLAC3D strength reduction method was used to simulate the process of the inner dumping pressure foot in the south slope, and the variation rule of the potential sliding surface position and stability coefficient in the process of the inner dumping pressure foot in the south slope was obtained. The optimal geometrical parameters of material cross section in the south side of the southern open-pit mine are obtained. Based on the numerical simulation results, the limit equilibrium theoretical model of the inner dumping pressure foot in the south slope was established, and the calculation formula of the stability coefficient of the middle south wall in the process of the inner dumping pressure foot was deduced. The evolution law of slope stress in the process of pressing foot in the south slope is expounded and the mechanism of the change of the position of the potential slip surface and the improvement of the stability of the middle south wall in the process of the inner dumping pressure foot was expounded.
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