工程地质学报2017，Vol.25Issue(4)：985-992,8.DOI:10.13544/j.cnki.jeg.2017.04.012
深厚覆盖层中弱透水层对渗流影响的试验研究
EXPERIMENTAL RESEARCH ON EFFECT OF WEAK AQUIFER TO SEEPAGE
摘要
Abstract
The deep overburden dam foundation of strong and weak layers is always met in Southwest and Northwest China.Weak aquifer in deep overburden dam foundation has a great influence on seepage.The influence law needs to be explored in depth.Weak aquifer is set at different positions underneath dam foundation in this test.The depth of vertical cuttoff wall is variable.The result of this test shows that when weak aquifer at the middle of dam foundation,cuttoff wall can form semi-closed combined seepage prevention system,which can effectively decrease seepage discharge of dam foundation and exit gradient.When the semi-closed combined seepage prevention system is adopted in Shangjiang dam,seepage discharge and exit gradient meet allowable requirements.If weak aquife can be utilized,the depth of cuttoff wall can be greatly reduced.This study also finds that when the position of cuttoff wall is deeper,the seepage control of semi-closed combined seepage prevention system can effectively reduce seepage discharge and exit gradient.The results can provide some theoretical reference and suggestions for similar projects,so as to reduce the project cost.关键词
深厚覆盖层/弱透水层/渗流量/出逸坡降/防渗墙/联合防渗体系Key words
Deep overburden layer/Weak aquifer/Seepage discharge/Exit gradient/Cutoff wall/Combined seepage prevention system分类
建筑与水利引用本文复制引用
王正成,毛海涛,王晓菊,龙顺江,游杰,王林..深厚覆盖层中弱透水层对渗流影响的试验研究[J].工程地质学报,2017,25(4):985-992,8.基金项目
国家自然科学基金项目(51309262),重庆市科委基础与前沿研究计划项目(cstc2015jcyjA0300,cstc2015jcyjA00022)资助. （51309262）
