水利水电技术2017，Vol.48Issue(9)：89-97,9.DOI:10.13928/j.cnki.wrahe.2017.09.014
拱坝坝后局部加固对大坝工作性态影响研究
Study on influence from local reinforcement behind arch dam on its working behavior
摘要
Abstract
In order to determine the influence from the local reinforcing body behind arch dam on its working behavior,the deformation,the stress difference and the status of bonding interface of an arch dam with and without reinforcing body are studied through a simulation made on the temperature field at any moment after 50 years with the SAPTIS-software of multi-field simulation and nonlinear analysis.In the model,the hexahedral mesh is adopted for the dam body and the foundation and the boundary constraint condition is that the chain rod constraints are applied to the foundation surface,the foundation side surfaces and both the upstream and the downstream surfaces,while the influences from the changing processes of normal water level and reservoir temperature,the temperature changing process,the concrete hydration heat and the solar radiation,etc.are considered as well.The result shows that under the condition of the normal temperature drop,the downstream deformations of the dam without and with reinforcing body are 23.1 mm and 20.1 mm respectively with the difference of 13％,while the difference is up to 20％ under the condition of the normal temperature rise with the difference up to 20％.When the dam is reinforced with a reinforcing body,the range of the tensile zone at the edge of its upstream face is increased,which is almost the same with the dimension of the downstream reinforcing body,but the maximum value of the tensile stress is obviously decreased from 1.3 MPa to 0.9 MPa.The result indicated that all over the bonding interface between the dam body and the reinforcing body is under a compressionshearstate,of which the phenomenon of stress concentration in the upper edge zone is obvious,but the internal stress is less,thus the local reinforcing body behind the dam increases the stiffness of the dam,decreases the deformation of the dam body toward the downstream direction,changes the law of the stress distribution of the dam body and makes the stress distribution more uniformized,which has a certain improving effect on the working behavior of the dam.The study result can provide a reference for the reinforcing treatment of the similar arch dam.关键词
拱坝/加固/有限元法/工作性态/大坝安全/温度应力Key words
arch dam/reinforcement/finite element method/working behavior/dam safety/temperature stress分类
水利科学引用本文复制引用
顾佳俊,周秋景..拱坝坝后局部加固对大坝工作性态影响研究[J].水利水电技术,2017,48(9):89-97,9.基金项目
国家自然科学基金项目(51579252,51439005) （51579252,51439005）
国家重点研发计划项目(2016YFB0201003) （2016YFB0201003）
流域水循环模拟与调控国家重点实验室基金项目 （）
