摘要
在对渗流评估方法进行一定探讨的基础上,对某水利枢纽工程坝址区厂房基坑开挖进行了渗透变形评估。结果表明,在坝轴线方向上,无防渗墙时坡面土体在渗透力的作用下是不稳定的,有防渗墙时坡面水力坡降降到0.05以下。在砂卵砾石层与基岩的交界处仍存在略大的水力坡降(值为0.56),如有水在细砂层、砾质中粗砂层渗出,则有可能出现渗流失稳,但总的说来由于防渗墙使水力坡降已降到很小,出现流土和管涌失稳的可能性不大。
The seepage deformation of the foundation pit excavation of power-house of a hydro-project is evaluated, based on probing into the method of evaluating the seepage deformation. The results indicate that along the axis of dam, the soil mass on slope of foundation pit is unsafe without impervious wall; when setting impervious wall, the hydraulic gradient on slope steps down to the value lower than 0.05; but the hydraulic gradient of the common boundary of base rock and gravelly medium-coarse sand is somewhat high; so seepage deformation may occur if water seeps out from fine sand soil and gravelly medium-coarse sand. On the whole, the probability of seepage deformation is small when setting impervious wall because the hydraulic gradient reduces to very small value.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第11期2435-2439,共5页
Rock and Soil Mechanics
关键词
渗透变形
水力坡降
基坑开挖
防渗墙
seepage deformation
hydraulic gradient
foundation pit excavation
impervious wall
