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随着露天矿山开采深度的不断增加,地应力成为影响边坡稳定性的重要因素。基于改进的Spencer法,推导并建立了考虑水平地应力作用的边坡三维极限平衡计算公式和程序,以首铁水厂铁矿边坡为例进行了应用分析,并与基于强度折减法的FLAC3D数值分析结果和现场监测结果进行了对比研究。研究表明:无论是边坡三维极限平衡分析还是数值模拟,考虑水平地应力作用得到的安全系数都比不考虑水平地应力作用得到的安全系数小,得出的边坡临界滑体尺寸偏大;数值模拟中,考虑地应力作用时得到的位移与边坡现场监测位移更为接近。因此,在深凹高陡边坡稳定性分析中必须考虑地应力的影响。
With the continuous increase of the open pit mining depth, the in-situ stress has become an important factor affecting the slope stability. Based on the improved Spencer method, the formulas and procedures for calculating the three-dimensional limit equilibrium of slopes with horizontal stresses are deduced and established. The analysis is made based on the example of the iron mine slope in the First Iron Works and compared with FLAC3D Analysis results and field monitoring results were compared. The results show that the safety factor obtained by considering the horizontal stress is smaller than that obtained without considering the horizontal stress, no matter whether the slope is a three - dimensional limit equilibrium analysis or numerical simulation. The critical slope size of the slope is too large. In numerical simulation, the displacement obtained when considering the effect of in-situ stress is closer to the on-site monitoring displacement of the slope. Therefore, the influence of in-situ stress must be considered in the stability analysis of deep and steep slopes.