几种特殊挡土墙稳定性分析与对比

Comparative Analysis of Stability of Specific Retaining Wall

分析比较特殊地段有特殊功能要求的特殊挡土墙结构,可为特殊条件下的挡土墙规划设计提供参考依据。为此介绍了四种特殊挡土墙型式(挡土墙墙趾处设置排水沟结构、挡土墙墙角设置人行道结构、"壳体"基础挡土墙结构、"空洞"基础挡土墙结构),构建了挡土墙强度折减有限元模型,对比分析了相同地质条件、填土用料相同及挡土墙体积相同时四种特殊挡土墙的稳定性程度。对比计算表明,挡土墙的结构布置方式对其稳定性影响较大,滑裂面长度大的挡土墙结构稳定性高,滑裂面长度小的挡土墙结构稳定性低,若要提高挡土墙的稳定性,本质上是要使该挡土墙结构产生的滑裂面长度变大;填土面倾角越大,挡土墙的稳定性越低,填土内越易形成指向挡土墙的滑动趋势,因此应尽量避免填土面倾斜过大。

Different styles of retaining wall have been proposed to fit different terrain conditions and functional requirements,which provided reference for design of retaining wall in particular conditions.Four new specific styles of retaining wall,such as drainage ditch located at toe of retaining wall,footway located at waist of retaining wall,shell structure of retaining wall and retaining wall with cavity filling has been studied by using strength reduction FEM model,with the same geological conditions and the same volume of retaining wall.It is found that the stability of retaining wall controlled by its structure mode;the stability of retaining wall increased when the length of fracture surface increased and vice versa;enhancing the stability of retaining wall is essentially to increase the length of fracture surface;when the slope angle of filling increased,sliding tendency is more easily happened towards retaining wall,and the stability of retaining wall decreased.Therefore,it is advised to fill the retaining wall with small slope angle of filling.