摘要
为分析非线性Mohr-Coulomb破坏准则下孔隙水压力对挡土墙主动土压力的影响,采用极限分析上限定理推导挡土墙主动土压力的解析解,采用MATLAB软件求解主动土压力的数值解,并分析了非线性Mohr-Coulomb破坏准则相关参数以及孔隙水、土体容重、挡土墙高度等对主动土压力和墙后破裂角的影响.研究表明,孔隙水等因素对主动土压力有较大影响,随着孔隙水系数、非线性系数、土体重度、地表荷载增大或土体初始黏聚力减小,挡土墙主动土压力显著增大.此外,非线性系数及孔隙水对挡土墙破裂角也会产生较大影响,非线性系数越小或孔隙水系数越大,挡土墙破裂角越大.因此,建议在挡土墙设计中应合理考虑土体非线性特征及孔隙水效应,增加挡土墙排水设计,以免低估主动土压力而导致挡土墙发生破坏.
The influence of pore water pressure on active earth pressure of retaining wall under nonlinear Mohr-Coulomb failure criterion is analyzed in the paper. The upper bound limit analysis is used to derive the analytical solution of active earth pressure of retaining wall. The numerical solution of active earth pressure is solved by MATLAB software. The influence of the parameters of nonlinear Mohr-Coulomb failure criterion, pore water, soil bulk density and retaining wall height on the active earth pressure and the fracture angle behind the wall are analyzed. Results show that pore water and other factors have great influence on active earth pressure. With the increase of pore water coefficient, nonlinear coefficient, soil weight and surface load or the decrease of soil initial cohesion, the active earth pressure of retaining wall increases significantly. In addition, the nonlinear coefficient and pore water also have a great influence on the fracture angle of retaining wall. The smaller the nonlinear coefficient or the larger the pore water coefficient, the larger the rupture angle of retaining wall. Therefore, it is suggested that the nonlinear characteristics of soil and pore water effect should be reasonably considered in the design of the retaining wall. The drainage design of the retaining wall should be increased to avoid the damage of the retaining wall caused by underestimating the active earth pressure.
作者
汤宇
杨维
张标
鲁晓明
刘翔
戴亚军
蒋瑾
TANG Yu;YANG Wei;ZHANG Biao;LU Xiaoming;LIU Xiang;DAI Yajun;JIANG Jin(The First Engineering Co.,Ltd.,China Railway Fifth Group,Changsha 410117,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Changsha Metro Group Co.,Ltd.,Changsha 410019,China;School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《矿业工程研究》
2021年第4期15-22,共8页
Mineral Engineering Research
基金
国家自然科学基金资助项目(52074116
52004088)
湖南省自然科学基金面上资助项目(2019JJ40082)
湖南科技大学博士启动基金资助项目(E52076)。
关键词
非线性破坏准则
上限定理
孔隙水
主动土压力
nonlinear failure criterion
upper bound theorem
pore water
active earth pressure
