顺层边坡首次破裂长度及影响因素分析

Analysis on Initial Crack Length and Its Influence Factors of Bedding Slope

依托仁沐新高速公路平乐互通顺层边坡治理工程,采用二维有限元模型对坡体位移及应力进行数值模拟,给出首次破裂长度的确定方法;并进一步研究岩土体力学参数及边坡几何尺寸对首次破裂长度的影响规律。研究结果表明:塑性区破坏长度即顺层边坡的首次破裂长度;边坡稳定性越差,首次破裂长度就越大;滑面黏聚力和内摩擦角与首次破裂长度负相关,滑体弹性模量、滑面弹性模量、滑体厚度及滑面倾角与首次破裂长度正相关;其影响权重为:滑面倾角〉滑体厚度>滑面内摩擦角〉滑面黏聚力〉滑面弹性模量>滑体弹性模量。

Based on the slope treatment project of Pingle interchange bedding slope,the slope displacement and stress are analyzed by the 2D finite element model,and the determination method of the initial crack length is comfirmed.Furthermore,the influence rule of geotechnical and physical parameters on the initial crack length is studied to provide the basis for this project.The research results show that first,the failure length of plastic zone is the initial crack length of bedding slope.Then,the worse the overall stability of the slope,the greater the initial crack length.In addition,the cohesion and internal friction angle are negatively correlated with the initial crack length,while the elastic modulus of sliding mass or sliding surface,the thickness of sliding mass and the inclination angle of sliding surface are positively.Finally,the weights of influence are as follows:the inclination angle of sliding surface>the thickness of sliding mass>the internal friction angle of sliding surf.