水位升降对顺层岩坡稳定性影响的上限分析方法

在构造顺层岩石边坡的简单直线破坏模式基础上,将强度折减技术与极限分析上限定理结合,推导边坡内外水位升降影响条件下的顺层边坡稳定性安全系数的目标表达式,并采用序列二次规划迭代法进行求解。通过算例计算,分析水位变化参数对顺层岩石边坡坡体安全系数和潜在破裂面的影响。研究结果表明:边坡内外水位升降对边坡安全系数和破坏范围存在不可忽视的影响,但当岩层倾角处于一定范围时,岩层倾角对边坡安全系数和破坏范围的控制程度更强。

Upper bound stability analysis for parallel bedding rock slope subjected to water level fluctuations

By analyzing the mechanic properties of parallel bedding rock slope,its corresponding simple straight linecritical failure mechanism was obtained.By combining the shear strength reduction technique and upper bound method,the internal and external energy dissipation under limit state were deduced.Thus the objective function of safety factor for a given parallel bedding rock slope can be obtained and solved by SQP iteration optimization.The relationship of water level change parameters and the safety factor and the instability failure range of parallel bedding rock slope was analyzed by using calculating example.From the numerical results,it can be seen that the impact of water level fluctuations on safety factor and instability failure range can not be ignored.But when the strata inclination is within limits,the safety factor and instability failure range could be better controlled by the slope angle and strata inclination.