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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。
The analysis and comparison of special retaining wall structures with special functional requirements can provide references for the design and planning of retaining walls under special conditions. This paper introduces four types of special retaining wall (retaining wall wall toe set drainage structure, retaining wall corner set walkway structure, “shell ” foundation retaining wall structure, “hollow ” foundation block Soil wall structure), the finite element model of retaining wall strength reduction is constructed, and the stability of four special retaining walls under the same geological conditions, the same filling materials and the same retaining wall volume are analyzed. The comparison shows that the structure of the retaining wall has a great influence on the stability of the retaining wall. The stability of the retaining wall with large length of the sliding surface is high and the stability of the retaining wall with small length of the sliding surface is low. The stability of the retaining wall is essentially to make the length of the sliding surface generated by the retaining wall structure larger; the greater the filling surface inclination, the lower the stability of the retaining wall, the easier it is to form a directional barrier Soil wall sliding trend, it should try to avoid filling surface tilt too large.