高速公路填砂路基边坡稳定性分析

Slope Stability Analysis of Sand Embankment for Expressway Engineering

研究目的:为解决优质路基填料日益匮乏的难题,填砂路基在我国冲积平原缺土富砂地区高等级公路建设中受到重视,其边坡稳定性是填砂路基设计与施工的控制要素之一。基于剪切强度折减法,就影响填砂路基边坡稳定性的各设计参数进行敏感性分析,提出增强填砂路基边坡稳定性措施,为高速公路建设提供依据。研究结论:剪切强度折减法能合理分析填砂路基的边坡稳定性;填砂与地基、包边土的抗剪强度指标(主要指粘聚力c值)数值大小的匹配关系将直接影响到路堤安全系数值,可采取放缓路堤边坡、加强填砂-包边土界面的施工处理与路堤的压实等办法来提高高速公路填砂路基的边坡稳定性。

Research purposes： The sand embankment has been growing concern in high class highway engineering construction over plain area to solve the difficult problem of high quality subgrade filling absence. The slope stability is one of the key factors in sand embankment design and construction. Based on Shear Strength Reduction Method （SSRM）, a sensibility analysis of embankment cross - section geometry size and filling material properties for sand embankment slope stability has been carried out. Measures to increase sand embankment slope stability were put forward to provide reference for expressway engineering construction. Research conclusions： The Shear Strength Reduction Method （SSRM） can be conducted to analyse the sand embankment slope stability reasonably. The shear strength parameters （mainly cohesive c ） matching relations between sand filling and clay soil layer will effect the slip surface behaviors directly. Some constructive advice, such as decreasing the side slope angle, enhance sand filling -clay soil layer interface construction treatment and embankment compaction, was drawn to increase the sand embankment slope stability in practice.