广东某高速公路滑坡成因分析与防治对策

Causes Analysis and Prevention Countermeasures of Landslide of an Expressway in Guangdong Province

基于广东省汕头至湛江高速公路某边坡滑坡,在勘察的基础上分析了引起现状边坡失稳的内因与诱因,并构建有限元模型,对滑坡的变形特征、发展趋势与形成机理进行研究,提出治理对策。结果表明:地层外倾结构面是形成滑坡的内因,人工开挖与降雨是形成滑坡的诱因;随着降雨时间的持续,入渗面逐渐下降,在坡脚形成了饱和区;受雨水渗流影响,边坡有进一步滑动的趋势;建议采用抗滑挡墙+预应力锚杆+综合排水的治理方案。

Relying on the landslide of a slpoe of Shantou—Zhanjiang expressway in Guangdong,the internal cause and inducement of the current slope instability are analyzed on the basis of investigation,and the finite element model of the landslide is constructed.The deformation characteristics,development trend and formation mechanism of the landslide are studied,and the countermeasures and suggestions are put forward.The results show that the external structural plane of the strata is the internal cause of the landslide,and the artificial excavation and rainfall are the inducement.With the duration of rainfall,the infiltration surface gradually decreased and the saturated area was formed at the foot of the slope.The slope tends to slide further under the influence of rainwater seepage.It is suggested to adopt the treatment scheme of anti-sliding retaining wall,prestressed anchor and comprehensive drainage.