顺层路堑边坡锚杆支护稳定性的有限元模拟分析

Simulation analysis of finite element on stability of bedding rock cutting slope supported by anchor structure

基于理想弹塑性本构模型和 Drucker-Prager 准则,运用 ANSYS 软件和有限元数值模拟技术,建立了顺层岩体边坡的有限元分析模型。结合沪蓉国道主干线宜昌至恩施公路白氏坪-榔坪段顺层路堑高边坡工程实例,对顺层岩体路堑边坡布设锚杆支护前后的应力、变形和稳定性进行了模拟分析。分析比较表明,锚杆支护结构可以减小边坡临界状态下的最大位移、增大最危险接触面的摩擦力和提高边坡的稳定性系数,从而能有效地提高边坡的稳定性以防止顺层滑坡的发生。

Based on perfect elastoplastic constitutive model and Drucker-Prager yield criterion,and using ANSYS software and finite element numerical simulation technology,a finite element analysis model for bedding rock cutting slope is established.The stress, deformation and stability of the bedding rock cutting slope before and after supported by anchor are simulated and analyzed for the high bedding rock cutting slope engineering from Baishiping to Langping in Yichang to Enshi highway in the HU-RONG national main trunk.The analysis and comparison indicate that the maximum displacement of the slope at critical state is reduced;the friction force on the most dangerous contact surface is increased;and the stability coe^cient is raised when the slope is supported by anchor. So the stability of the bedding rock cutting slope can be improved to protect the slope from bedding sliding.