水利水电技术2018，Vol.49Issue(4)：50-55,6.DOI:10.13928/j.cnki.wrahe.2018.04.008
不同掺砾量对黏土心墙的影响
Influences from different gravel contents on clay core-wall
摘要
Abstract
In order to investigate the working behavior and safety status of the core-wall under the conditions of the various gravel content levels for a dam with clay core-wall in the Southwest China and then determine the gravel mixing construction scheme for it,3-D finite element method is adopted to fully consider the influence from the increase of gravel content on the permeability and deformation strength of the core-wall,while the variation laws of both the horizontal and vertical displacements of the corewall during the completion period and the impoundment operation of the dam are studied through calculating all the gravel mixing schemes with double-line method,simultaneously,the variation of the arching effect of the core-wall is analyzed with the arching effect coefficient.The study result shows that when the gravel content is controlled to be below 50％,both the settlement deformation and the deformation along the river flow direction of the core-wall are decreased along with the increase of the gravel content,thus the arching effect of the core-wall is improved.When the gravel content is larger than 50％,the restraining effects from the mixed gravel on the settlement deformation and the arching effect of the core-wallare weakened,meanwhile,the deformation of the core-wall along the river flow direction increases.Under the comprehensive consideration of the working behavior of the clay core-wall,the gravel content of less than 50％ is suggested for the relevant project.关键词
黏土心墙坝/掺砾量/心墙变形/拱效应Key words
dam with clay core-wall/gravel content/core-wall deformation/arching effect分类
水利科学引用本文复制引用
朱嘉伟,任旭华,张继勋..不同掺砾量对黏土心墙的影响[J].水利水电技术,2018,49(4):50-55,6.基金项目
南水北调中东线工程运行管理关键技术及应用(2015BAB07B10) （2015BAB07B10）
