曲线滑裂面下有限宽度填土主动土压力计算

发布时间：2018-02-04 16:02

本文关键词： 主动土压力有限土体曲线滑裂面变分极限平衡法薄层单元法　出处：《岩土力学》2017年07期 　论文类型：期刊论文

【摘要】：开展了刚性挡墙平动变位模式情况下墙后有限宽度土体破坏试验。试验结果表明,在墙后填土宽度较小情况下,土体破坏面为通过墙踵及某一固定点的曲面,由此基于变分极限平衡法,导得滑裂面曲线的具体方程式为对数螺旋曲线。在此基础上,结合薄层单元法,得到了墙后有限宽度土体的主动土压力合力及土压力强度的分布。与室内观测结果及库仑土压力值的对比表明,该方法相比经典土压力方法更接近于实测值。分析了不同填土宽高比n下的主动土压力分布规律,结果表明,主动土压力随n增加而逐渐增加,但n达到0.55时趋于稳定,因此,该值可作为墙后土体有限宽度的界限值。
[Abstract]:The failure test of soil mass with finite width behind the wall is carried out under the condition of the lateral displacement mode of rigid retaining wall. The test results show that the failure surface of the soil is a curved surface passing through the heel of the wall and a fixed point when the width of the backfill is small. Based on the variational limit equilibrium method, the specific equation of the slip surface curve is the logarithmic spiral curve. On this basis, the thin layer element method is combined. The distribution of active earth pressure force and earth pressure intensity of finite width soil behind the wall is obtained, which is compared with the results of indoor observation and Coulomb earth pressure value. Compared with the classical earth pressure method, this method is closer to the measured value. The distribution of active earth pressure under different ratio of width to height is analyzed. The results show that the active earth pressure increases with the increase of n. However, when n reaches 0.55, it tends to be stable, so this value can be regarded as the limit value of the finite width of soil behind the wall.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金(No.51278184,No.50708030) 教育部新世纪优秀人才支持计划(No.NCET-13-194) 湖南大学青年教师成长资助项目~~
【分类号】：TU432
【正文快照】： 墙后土体土压力取值是基坑支护结构设计的重要参数[1]。随着城市商业密集区的进一步开发,新建基坑往往与已有建筑物距离极小,从而造成墙后土体宽度狭窄的情况。一般情况下,采用经典的朗肯或库仑土压力理论近似计算土压力值,而此时已有建筑物限制了传统破坏面的充分发展,若仍采

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