墙土接触面的摩擦效应是挡墙土压力分析中需考虑的重要影响因素,首先,通过研究土体应力的分布规律,提出了墙土摩擦效应下墙后土体主应力迹线的确定方法;然后,根据大主应力迹线进行曲线型薄层单元分层,在探究土体微元小主应力变化规律的基础上,结合曲线单元体的静力平衡方程,建立考虑墙土摩擦效应的挡墙主动土压力分析新方法;最后,将本文方法与试验数据和其他方法进行验证和对比分析,对主动土压力系数的影响因素进行敏感性分析。研究表明:考虑墙土摩擦引起应力偏转的分析方法更能准确反映土体应力分布规律,验证了本文方法的合理性与可行性;主动土压力系数随填土摩擦角φ的增大而减小,随墙土间摩擦角δ的增大而增大。
Abstract
Friction at the contact surface between wall and soil is an important factor to be considered in analyzing the earth pressure of retaining wall. A novel method for analyzing the active earth pressure of retaining wall is proposed in consideration of the wall-soil friction based on static balance equation. First of all, the principal stress trajectory of soil behind the wall under the wall-soil friction effect is determined by studying the distribution of soil stress. On this basis, the trajectory is divided into curvilinear thin layers, and the change law of small principal stress of soil microelement is investigated. The method is verified with test data and compared with other methods. The sensitivity of active earth pressure coefficient to influential factors is also examined. Results demonstrate that the present method is rational and feasible as the distribution law of soil stress can be more accurately reflected by considering the stress deflection caused by wall-soil friction. The coefficient of active earth pressure reduces with the augment of internal friction angle φ of soil, while expands with the increment of friction angle δ between wall and soil.
关键词
挡墙 /
主动土压力 /
墙土摩擦 /
主应力迹线 /
曲线分层
Key words
retaining wall /
active earth pressure /
wall-soil friction /
principal stress trajectory /
curve layering
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