考虑层间剪切作用的挡墙主动土压力分析  

ANALYSIS OF ACTIVE EARTH PRESSURE CONSIDERING INTERLAMINAR SHEAR ACTION

作　　者：夏唐代[1,2] 程康 黄睿 单华峰 梁荣柱[5] XIA Tangdai CHENG Kang HUANG Rui SHAN Huafeng LIANG Rongzhu(MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China Rock Mechanics and Geo-Hazard Center, Shaoxing University, Shaoxing 312000, China Institute of Coastal Environment and Geotechnical Engineering, Taizhou University, Taizhou 318000, China Engineering Faculty, China University of Geosciences （Wuhan） , Wuhan 430074, China)

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,杭州310058 [2]浙江大学滨海和城市岩土工程研究中心,杭州310058 [3]绍兴文理学院岩石力学与地质灾害实验中心,浙江绍兴312000 [4]台州学院滨海环境与岩土工程研究所,浙江台州318000 [5]中国地质大学(武汉)工程学院,武汉410074

出　　处：《工业建筑》2017年第10期98-103,共6页Industrial Construction

基　　金：国家自然科学基金项目(51378463)

摘　　要：以墙后为无黏性填土的刚性挡墙为研究对象,首先基于库仑滑裂面,假定墙后土拱为抛物线形拱,分别建立平动模式下水平微单元平均竖向应力、层间剪切力与主动土压力的定量关系,以考虑水平微单元层间剪切作用的影响,在此基础上由静力平衡方程推导出主动土压力解析解。然后将求解的主动土压力值与前人的研究成果进行对比,验证该方法的合理性。最后,对该解析解进行参数分析,发现墙土摩擦角与填土内摩擦角的比值是影响层间剪切作用强弱的主要因素。该方法能考虑挡墙后土体中应力偏转现象以及水平微单元体层间剪切作用,较传统土压力计算方法,能够更真实地反映土体中的应力状态。A rigid retaining wall with cohesionless backfill was considered as research object. Firstly,the principal stress arch was assumed to be parabolic based on the Coulomb＇s slip surface. Then,the quantitative relationships between average vertical stress,the interlaminar shear stress of soil differential element and the active earth pressure were established. In consideration of the influence of interlaminar shear,the analytical solution of active earth pressure were derived through equation of static equilibrium. The accuracy of the proposed formulation was estimated by comparing with other studies. Finally,the parameters in the analytical solution were analyzed and the results indicated that the ratio of angle of internal friction between wall and backfill was the dominant impact on the interlaminar shear.Compared with the conventional calculation method,the stress deflection and the interlaminar shear action of horizontal differential units of soil behind retaining wall were taken into account. The stress state more close to the field condition could be obtained through the method.

关 键 词：无黏性填土 平动模式 土拱效应 抛物线形拱 层间剪切作用 水平单元分析 

分 类 号：TU432[建筑科学—岩土工程] TU476.4[建筑科学—土工工程]