期刊论文

中文

岩土力学

1000-7598

2022

43

9

2371-2382

10.16285/j.rsm.2021.1924

No.2021JJ40460:湖南省自然科学青年基金资助项目 No.51678230:国家自然科学基金 No.52079098:国家自然科学基金

本校为第一机构

目前主动土压力计算方法多仅针对土体处于饱和或干燥状态,忽略了其从非饱和到局部饱和,或饱和到非饱和的渐变过程,进而导致计算结果失真。鉴于此,首先开展了一系列刚性挡墙非饱和砂土主动土压力模型试验,揭示了墙后土体的破坏规律:(1)墙后土体顶部出现了近似竖直裂缝,且其发展深度随墙面粗糙度和含水率的增加而变大;(2)墙土界面摩擦对塑性区形状影响较小,且在挡墙移动过程中,墙后土体塑性区形状始终近似保持为平面。在试验基础上,引入广义有效应力原理,基于极限平衡分析建立了考虑吸应力效应的非饱和土主动土压力计算方法,理论与试验实测值表明,所提方法相比其他方法,更接近于试验值。分析了各主...

At present,the calculation methods of active earth pressure are mostly only for the soil in a saturated or dry state,ignoring the gradual process of soil from unsaturated to partially saturated,or from saturated to unsaturated,which leads to distortion of the calculation results.In this study,a series of model tests on the active earth pressure of unsaturated sand behind retaining wall is carried out to reveal the failure law of soil behind the wall.Observations show that,1) there is an approximately vertical crack on the top of the soil behind the wall,and its development depth increases with...