改进的岩质边坡临界滑动场计算方法

Improved Technique for Computing Critical Slip Fields of Rock Slope

针对岩体介质的不连续性的特点,将岩质边坡临界滑动场进行改进和推广。充分考虑结构面存在对岩质边坡稳定性的影响,对结构面采取新的处理方法,并基于岩体介质具有抗拉性的考虑,灵活设置张拉裂缝。用改进后的岩质边坡临界滑动场计算方法,编制相应的程序,对边坡进行数值模拟分析,使边坡在满足力与力矩平衡的条件下,按推力最大原则,快速、准确地找到岩质边坡临界滑动面并得出其相应的安全系数。并将此方法应用于5个算例和1个工程实例边坡的稳定性分析,和其他方法进行比较,结果说明改进后的该方法在岩质边坡稳定性分析中的准确性和高效性。

The improvement and extension for critical slip fields of rock slope was performed,in view of the discontinuity of rock.By fully considering the influence of structural surface to the stability of the slope,a new method was proposed to deal with structural planes,and tensile cracks were readily introduced based on the tensile strength of rock.The improved techniques for constructing critical slip fields of rock slope were incorporated into a computer program.By numerically simulation,the most dangerous sliding surfaces were traced according to the principle of maximum thrusts with satisfaction of both force and moment equilibria,resulting in critical slip surfaces quickly and exactly as well as the corresponding factors of safety.This method was applied to the stability analysis of five example slopes and a case slope,and the results showed its accuracy and high effectiveness in rock slope stability analysis in comparison with other methods.