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第28春第6期 2016年12月
浙江水利水电学院学报
J. Zhejiang Univ of Wat. Res & Electrie Pow.
Vol.28No.6 Dec.2016
丹巴闸坝覆盖层基础应变和渗流有限元计算分析
张俊嵩',缪慧丽',吕高峰?
(1.江苏省江都水利工程管理处,江苏扬州225200;2.国家能源局大坝安全监察中心,浙江杭州311122)
商要:丹巴闸坝工程根修建在深覆盖层上,深覆益层基础的变形和渗流稳定对工程影响很大,设计过程中采用三摘
维有限元建立模型,对覆益层基础的应力变形和渗流场进行计算.通过计算得出:(1)设计方案基础况降变形在 20cm以内,顺河向佳移在13cm以内,变形整体不大;(2)蓄水后孔隙水压力增大使有效应力减小,基础况降变
及大、小主应力均有明星减小;(3)深入基岩的防渗墙能起到很好的防渗作用,保证覆盖层的渗流稳定,关键词:覆盖层;应力史形;渗流;有限元
中图分类号:TV698
文献标志码:A
文章编号:1008536X(2016)12-0029-05
FiniteElement Calculation and AnalysisofStressDeformation
andSeepage of Overburden inDanbaDam ZHANG Jun-song', MIAO Hui-li', LYU Gao-feng
(1. Jangsu Water Conservaney Administrative Office, Yangzhou 225200, China; 2. Large Dam Safety Supervision Center, National Energy Administration,Hangzhou 311122, China)
Abstract: The deformation and seepage stability of deep overburden foundation have great influence on a gate dam. Three dimensional finite element model is used in the design process to calculate the stress and deformation of the overburden foundation and the seepage field. The calculation result shows: (1) foundation settlement is less than 20 cm as design plan, and displacement along river within 13 cm, therefore, the deformation is small; (2) after the impoundment, the in-creasing of pore water pressure decreased the effective stress, foundation settlement as well as major and minor principal stress were significantly reduced; (3) cutoff wall has good anti-seepage effect which ensures the seepage stability of overburden. Key words: overburden; stress and deformation; seepage; FEM
工程概况
丹巴闸坝深覆盖层上计划新建一闸坝工程,该
工程在横河向总长为351m,设计闸高为43m.该工
程从左到右依次为左岸混凝土坝、冲沙闸、泄洪闸、右岸混凝土坝、鱼道和右岸心墙坝.其中土石坝与右岸混凝土坝两者的连接形式为堆石扇形体(1-2],该闸坝横河向布置(见图1),
4142020+20
16168181
发发
左岸挡水坝段
冲砂闸
泄洪闸
小机组引水坝段
图1
口
鱼道
闸坝横河向建筑物布置图
右岸挡水坝段
60
土石坝段
1999.5 1956.5
收稿日期:2016-08-17
作者简介:张俊需(1985-),男,江苏扬州人,硕士,工程师,主要从事水闸工程技术管理、建筑物设施观测和工程维修养护工作。万方数据