水下填筑路堤的稳定性分析

Analysis on stability of underwater embankment

为研究路堤在复杂水下填筑条件下的稳定性,以千黄高速千岛湖库区路段工程为背景,采用有限元软件GeoStudio分析了不同水下填筑坡度和不同厚度薄弱层对路堤稳定性的影响。经确定性分析和概率分析方法对比得出以下结果:水下填筑的坡度越缓,薄弱层厚度越小,路堤安全系数越高,薄弱层对路堤稳定性的影响大于坡度;考虑土层抗剪强度参数的不确定性,得出存在薄弱层时,路堤失效概率在水下填筑坡度1∶1.3的情况下最低。

In order to study the stability of the embankment under complex underwater filling conditions,the finite element software GeoStudio was used for the analysis.Based on the Qiandao Lake Reservoir section of the Qianhuang Expressway,the influence of underwater embankment slope and the weak layer was considered.After comparing the deterministic analysis with the probabilistic analysis method,the following results are obtained.The slower the slope of underwater filling,the smaller the thickness of the weak layer,and the higher the safety factor of the embankment.The weak layer has more influence on the stability of the embankment than the slope.Considering the uncertainty of the shear strength parameters of the soil layer,it is concluded that in the presence of weak layers,the embankment failure probability is the lowest when the slope of underwater filling is 1∶1.3.