平移模式下挡墙塑性临界深度极限分析

发布时间：2018-04-24 05:14

本文选题：挡墙 + 临界深度　；参考：《岩土力学》2017年02期

【摘要】：土压力的分布及大小与挡墙的位移模式密切相关。挡墙后的填土处于主动土压力状态时,塑性临界深度是设计时需要考虑的问题。应用极限分析上限原理,将弹性覆盖层以下且与挡墙相邻的三角形土体微元作为研究对象。推导了外力功率和内能耗散功率,得到了挡墙在平移模式下塑性临界深度的计算公式,推导过程中考虑了挡墙位移方向效应。研究结果表明:朗肯等理论计算结果是推荐方法的一个特例。塑性临界深度随挡墙位移方向与水平面之间夹角、墙-土界面黏聚力和摩擦角以及填土黏聚力和内摩擦角的增大而增大。但当挡墙位移方向水平时,塑性临界深度与墙-土界面摩擦角无关。
[Abstract]:The distribution and magnitude of earth pressure are closely related to the displacement mode of retaining wall. When the fill behind the retaining wall is in the state of active earth pressure, the critical plastic depth is a problem to be considered in the design. Based on the upper limit principle of limit analysis, the triangular soil element under the elastic cover and adjacent to the retaining wall is used as the research object. The external force power and internal energy dissipation power are derived, and the formula for calculating the critical plastic depth of the retaining wall in the translational mode is obtained. The displacement direction effect of the retaining wall is considered in the derivation. The results show that Rankine and other theoretical results are a special case of the recommended method. The plastic critical depth increases with the increase of the angle between the displacement direction of the retaining wall and the horizontal plane, the cohesion force and friction angle between the wall and soil interface, and the cohesion force and the internal friction angle of the fill soil. However, when the displacement direction of retaining wall is horizontal, the critical plastic depth is independent of the friction angle of the wall-soil interface.
【作者单位】：重庆大学土木工程学院;河北工程大学土木工程学院;中国石油天然气股份有限公司西南管道分公司;重庆大学力学系;
【基金】：国家自然科学基金项目(No.41472245,No.41602301,No.51378169,No.51508150)~~
【分类号】：TU432

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