摘要
蓄水初期水位上升使得土石坝应力场和渗流场存在错综复杂的相互作用,而忽略渗透作用仅研究应力变形易产生偏差.本文基于Biot固结理论,采用变渗透系数的方法进行坝体施工期、蓄水期的流固耦合分析,并考虑坝料初始含水率及初始应力场的影响,以较真实的模拟蓄水初期瞬态渗流场对坝体应力变形的影响.结果表明:孔隙水压力的消散往往伴随着土体的变形,竣工期大坝变形主要以沉降为主,大主应力存在明显拱效应;蓄水使得心墙上游侧应力减小,坝体向下游错切变形.因此,初次蓄水对坝体不利,流固耦合作用对土坝蓄水初期应力变形影响不可忽视.
The stress field and seepage field of earth-rock dam have interaction and dynamic change. The rise of water level in the initial stage of water storage makes the stress and deformation of dam complex,and ignoring the influence of seepage easily leads to deviation of stress and deformation analysis. In this paper,based on biot consolidation theory,the fluid-solid coupling analysis of dam during construction and storage is carried out by using the method of variable permeability coefficient,and the influence of initial water content and initial stress field of dam material is considered,so as to simulate the influence of transient seepage field on stress and deformation of dam body. The results show that the dissipation of pore water pressure is often accompanied by soil deformation. During the completion period,the dam deformation is mainly settlement,and the large main stress has obvious arch effect. The water storage reduces the stress on the upstream side of the core wall and the dam body is staggered to the downstream side. Therefore,it is necessary to consider the influence of transient seepage field in the analysis of stress and deformation of dam body during initial impoundment.
作者
刘文
尹伟强
LIU Wen;YIN Weiqiang(Guangchang County Water Conservancy Bureau of Jiangxi Province,Guangchang 344900,China;Ganzhou Municipal Hydraulic and Hydroelectric Survey and Design Institute of Jiangxi Province,Ganzhou 341000,China)
出处
《江西水利科技》
2019年第3期174-179,共6页
Jiangxi Hydraulic Science & Technology
关键词
心墙坝
流固耦合
瞬态渗流
应力变形
Core dam
Seepage-stress coupling
Transient seepage
Stress deformation
