山区高速公路运营期路堑滑坡病害处治设计实例

Case Analysis of Treatments of Cutting Landslide in Mountainous Expressway During Its Operation

以川东地区某高速公路一滑坡的路堑病害为研究对象,详细讨论了工程处治设计的关键流程.对病害原因的分析表明:排水措施不足是路堑多次发生浅层病害的主要原因,具体有坡体前缘约束未清除、框架梁施工延误、多次强降雨等因素的共同作用,造成路堑变形体最终演变为滑坡;路堑地层二元结构特征的空间分布,对其稳定也有一定影响.协同方案比选、工程类比及计算校核结果,确定以“锚索框架梁”作为滑坡病害的主体加固措施.同时,构建空间排水系统,通过截、排、疏、导等措施的协同工作,以有效排除病害工点排水不畅的隐患.所得成果可为类似滑坡病害治理提供技术资料与参考.

In this paper,the way to deal with problems at a cutting in an expressway of East Sichuan area is taken as an example for study.With recurrent attacks,these problems eventually cause a landslide.The paper also discusses the key process of engineering treatment design to solve these problems.The analysis of these problems shows that the recurring shallow collapses at the road cutting are caused by the insufficiency of drainage measures.Because of the cleaning up of the barriers on the leading edge of the slope,the construction delay for frame beams and multiple heavy rainfalls,the cutting deformation eventually evolves into landslide.In addition,the stability of the cutting to a certain degree is also influenced by the spatial distribution of the dual structure of stratum at the cutting.Following a series of scheme comparisons,engineering analogy and theoretical calculations,the anchor cable frame beam is chosen as the main reinforcement measure for the landslide.Meanwhile,a stereoscopic drainage system is constructed in order to effectively meet the actual demand for dealing with landslides.The obtained results could provide technical data and reference to both the problem prevention and the treatment of similar projects.