层状岩体边坡动态稳定性拟静力上限分析

将强度折减技术与极限分析上限定理结合,利用安全系数Fs评定指标对层状岩体边坡进行稳定性上限分析,与已有研究成果进行了对比分析,并较为详细地分析了相关参数对层状岩体坡体安全系数和潜在破裂面的影响。分析结果表明,与同类计算方法的对比可以证明表明文中方法的正确性;边坡安全系数和破坏范围受边坡坡度、岩体重度、边坡高度、动载效应系数和岩层倾角的控制;当岩层倾角处于一定范围时,层状岩体边坡发生顺层失稳的可能性最大,工程中需特别注意。

Upper bound quasi-static analysis of dynamic stability of layered rock slopes

Based on the upper bound limit analysis theorem and the shear strength reduction technique, the equation for expressing the critical limit-equilibrium state was employed to define the safety factor and its corresponding critical failure mechanism for a given layered soft-rock slope by means of the kinematical approach of limit analysis theory. The definition of safety factor was adopted in the present method so that the results from the limit analysis can be applied to engineering practices directly. The case study and comparative analysis show that the solutions presented agree well with available predictions; and the validity of the analysis method could be illuminated. From the numerical results, it is also shown that the safety factor and the instability failure range of layered soft-rock slope are controlled by slope angle, bulk density, slope height, seismic effect coefficients and strata inclination; and when the strata inclination within a certain range, the instability probability of layered soft-rock slope reaches its maximum.