黄土地区非对称公路路堤稳定性分析

Stability Analysis of Asymmetric Highway Embankment in Loess Areas

利用FLAC3D软件建立了非对称黄土公路路堤数值分析模型,在强度折减法的基础上,按M-C强度理论分析抗剪切强度参数内摩擦角和黏聚力对路堤稳定性的影响。通过对比不同加筋层数、筋土界面参数和荷载形式下加筋路堤的安全系数和剪应变增量云图,归纳总结出上述参数对路堤稳定性的影响规律。模拟结果表明:内摩擦角和黏聚力对路堤稳定性影响规律相似,安全系数和塑性贯通区均随剪切强度参数增大而增大。格栅加筋效果随着加筋层数和界面参数增大而增大,但增加幅度逐渐减小并最终趋于稳定。此外,非对称荷载作用下路堤稳定性较均布荷载的差。

The asymmetric loess embankment was established by FDM software FLAC3D. The influence of internal friction angle and cohesion of embankment fill on the stability of embankment was analyzed by using the strength reduction method. Then, important factors that influence the stability of embankment, such as the layer of reinforcement, characteristics of reinforcement interface and form of load, had been analyzed in detail. Simulation results show that the influence of internal friction angle on the stability of embankment was similar to that of cohesion. The effect of reinforcement increased gradually with decreasing the increase rate as the layer of geogrid and characteristics of reinforcement interface increased. The stability of embankment under asymmetric traffic load was less than that under the uniform load case.