滇西红层软岩斜坡高填路堤边坡优化设计研究  

Study on Optimized Design of High Embankment for Red-bed Soft Rock Slope in Western Yunnan

作　　者：丁静声[1,2] 罗清井 吴国雄[1,2] 

机构地区：[1]重庆交通大学交通土建工程材料国家地方联合工程实验室,重庆400074 [2]重庆交通大学土木建筑学院,重庆400074

出　　处：《路基工程》2014年第4期115-119,共5页Subgrade Engineering

摘　　要：以云南施(甸)孟(定)公路K38+530^+635段斜坡高填路堤边坡为例,运用有限元数值分析方法,结合强度折减理论,分析了原设计路基的沉降变形与稳定性,数值计算结果显示原设计路基的稳定系数不能满足规范规定的最小值要求。采取相同计算方法,分别对线形进行调整及边坡优化,对不施加格栅加固和施加格栅加固的路基边坡进行稳定性计算。研究结果表明:斜坡高填路堤破坏主要表现为,当边坡失稳达到临界状态时,与地表面接触的路基坡顶的填料首先达到塑性变形破坏;当路堤稳定性不足时,应尽可能采取各种技术措施,优化路堤边坡设计,提高路堤的整体稳定性,同时应加强公路运营期间的边坡监测与维护,这将为山区斜坡高填路堤的设计与施工提供参考。Taking the high embankment slope in the K38 ＋ 530 - ＋ 635 Section of Shidian-Mengding Highway in Yunnan as an example, and using FEM numerical analysis together with strength reduction theory, the settlement deformation of the subgrade designed originally and its stability were analyzed. The results of numerical calculation showed that such subgrade had the stability factor not meet the minimum value specified in the standard. With the same calculation method, after alignment adjustment and slope optimization, the stability of subgrade slope with and without geogrid was calculated. The study results show that the failure of high embankment for slope mainly presents that, where the instable slope reaches a critical state, the filler of slope crest in contact with the ground surface appears plastic deformation at first; where the embankment has insufficient stability, and various technical measures should be taken by every reasonable effort. It may be referred to by the design and construction of high embankment for slope in mountainous area.

关 键 词：红层软岩 斜坡高填路堤 边坡优化设计 有限元强度折减法 边坡稳定性 

分 类 号：U416.12[交通运输工程—道路与铁道工程]