| 基于主应力迹线分层的挡墙被动土压力分析方法 |
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| 引用本文： | 张慧姐,曹文贵,刘涛.基于主应力迹线分层的挡墙被动土压力分析方法[J].岩土力学,2020,41(9):3022-3030. |
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| 作者姓名： | 张慧姐 曹文贵 刘涛 |
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| 作者单位： | 湖南大学 土木工程学院，湖南 长沙 410082 |
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| 基金项目： | 国家自然科学基金项目（No.51879104）。 |
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| 摘 要： | 为了探讨墙背倾斜与粗糙程度对挡墙被动土压力的影响，首先，结合被动状态下受挡墙墙背和滑动面摩擦影响的滑动土楔内主应力传递特点，采用圆弧形主应力迹线描述滑动土楔中最大主应力传递规律，并提出了最大主应力迹线几何参数的确定方法；然后，采用沿最大主应力迹线的分层方法将挡墙后滑动土楔划分为若干圆弧形曲线薄层单元，并通过该薄层单元受力分析，依据其静力平衡条件建立了挡墙被动土压力分析新方法。该方法不仅可反映墙土摩擦和墙背倾斜程度对被动土压力的影响，而且有效避免了目前土压力分析方法研究中普遍采用的直线薄层单元难以准确考虑复杂的单元实际受力情况的问题，从理论上确保了新提出的挡墙被动土压力分析方法更具合理性；最后，通过试验、现有同类方法及所提方法分析曲线的对比，表明了新方法的合理性与优越性。就墙背倾斜与粗糙程度对挡墙被动土压力分布及合力作用点高度的影响规律也进行了探讨。
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| 关 键 词： | 被动土压力 墙土摩擦 倾斜挡墙 圆弧形曲线薄层单元 大主应力迹线 |
| 收稿时间： | 2019-11-25 |
| 修稿时间： | 2020-04-19 |
Analysis method of passive earth pressure for retaining wall layered
based on principal stress trajectory |
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| ZHANG Hui-jie,CAO Wen-gui,LIU Tao.Analysis method of passive earth pressure for retaining wall layered
based on principal stress trajectory[J].Rock and Soil Mechanics,2020,41(9):3022-3030. |
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| Authors: | ZHANG Hui-jie CAO Wen-gui LIU Tao |
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| Institution: | College of Civil Engineering, Hunan University, Changsha, Hunan 410082, China |
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| Abstract: | This study focused on the influence of wall inclination and roughness on passive earth pressure for the retaining wall. Firstly, considering the friction between retaining wall and sliding wedge surface under passive state, the principal stress transfer law of a sliding soil wedge is described by the circular major principal stress trajectory. Subsequently, the method for determining the geometric parameters of the major principal stress trajectory is proposed. Then, the sliding soil wedge behind the retaining wall is divided into several circular thin-layer along the major principal stress trajectory. The new method of passive earth pressure is established by force analysis of the thin-layer element according to the static equilibrium condition. The method reflects the influence of wall-soil friction and wall inclination on the distribution of passive earth pressure. The problem that the complex stress of the element cannot be accurately considered by the linear thin-layer element method, commonly used in the current earth pressure analysis, can be avoided in the proposed method with more reasonable passive earth pressure calculations. Finally, comparison and analysis of distribution of passive earth pressure among the existing similar methods and the experimental results indicate the proposed method is reasonable and superior. Also, the influence of wall inclination and roughness on the distribution of passive earth pressure and the height of application of resultant force is discussed. |
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| Keywords: | passive earth pressure wall-soil friction inclined retaining wall circular curved thin-layer element major principal stress trajectory |
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