考虑三维空间效应的砌块土坡侧向土压力分析

发布时间：2018-02-27 04:17

本文关键词： 侧向土压力砌块土坡三维分析极限平衡拟静力　出处：《岩土工程学报》2017年09期 　论文类型：期刊论文

【摘要】：在支挡结构稳定性设计中,基于侧向土压力系数的设计方法简单易用,一直被广泛用于实际工程中。已有侧向土压力系数主要在平面应变分析方法下计算获得,忽略了三维空间效应的影响。基于三维边坡稳定分析方法,采用变分法获得安全系数极值下对应的三维破坏机制,建立考虑三维效应的砌块土坡侧向土压力计算方法,从而揭示三维效应对砌块土坡侧向土压力大小的影响规律。提出的方法还考虑了砌块与土摩擦作用力和水平地震力的影响。给定参数值,通过优化计算获得了不同长高比下的三维砌块土坡水平土压力系数,以图的形式给出便于使用。从计算结果可以发现,在地震作用下,三维空间效应对侧向土压力的影响显著,特别是对于垂直的支挡结构。最后结合算例,通过与传统的平面应变下侧向土压力结果进行对比分析,显示了考虑三维效应的土压力系数对支挡结构稳定性设计的重要性。
[Abstract]:In the stability design of retaining structure, the design method based on lateral earth pressure coefficient is simple and easy to use, and has been widely used in practical engineering. Based on the three-dimensional slope stability analysis method, the three-dimensional failure mechanism corresponding to the maximum value of safety factor is obtained by using variational method, and the calculation method of lateral earth pressure of block slope considering three-dimensional effect is established. Thus, the effect of three-dimensional effect on lateral earth pressure of block slope is revealed. The influence of block and soil friction force and horizontal seismic force are also taken into account in the proposed method. The horizontal earth pressure coefficient of three dimensional block slope with different ratio of length to height is obtained by optimizing calculation, which is easy to use in the form of diagram. From the result of calculation, it can be found that the effect of three dimensional space effect on lateral earth pressure is significant under earthquake action. Especially for vertical retaining structure. Finally, by comparing with the results of lateral earth pressure under plane strain, it shows the importance of earth pressure coefficient considering three-dimensional effect to the stability design of retaining structure.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;江苏省岩土工程技术工程研究中心(河海大学);扬州大学建筑科学与工程学院;
【基金】：国家自然科学基金重点项目(41630638);国家自然科学基金项目(51508160) 中央高校基本科研业务费专项资金项目(2017B00814)
【分类号】：TU432

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