摘要
针对二元地基基坑降水过程中极易引发的渗透破坏和周边建筑物沉降问题,利用实验室渗流试验装置对基坑降水过程中悬挂式防渗墙和回灌井在控渗和减小坑外沉降方面的作用进行了试验研究。对基坑直接降水、设置防渗墙下的基坑降水以及设置防渗墙和回灌井时的基坑降水3种情况下的土体内沿程水位变化进行对比分析,对防渗墙和回灌井对水位的影响规律进行了探讨。试验结果表明,防渗墙和回灌井的存在可以减小二元地基降水过程中土体内部水力梯度,有效控制渗透破坏的发生条件,同时改善了坑外水位的下降幅度,起到抬升水头控制坑外沉降的作用。
To study the combined effect of suspended cut-off wall and recharge well on controlling seepage and diminishing sedimentation, the test is carried out in seepage equipment. The change of groundwater level under three different rainfall conditions is measured, and then the results are analyzed. These three rainfall conditions are excavation direct precipitation, suspended cut-wall excavation dewatering, suspended cut-off wall with recharge well excavation precipitation. The test results indicate that suspended cut-off wall work with recharge well can reduce the hydraulic gradient and control seepage failure of twolayer foundation effectively. Meanwhile, they can mitigate the falling range of the water level, uplift the water stage, and control the sedimentation.
出处
《现代交通技术》
2017年第6期80-83,共4页
Modern Transportation Technology
关键词
二元地基
基坑降水
渗透破坏
悬挂式防渗墙
回灌井
two-dimensional foundation
excavation dewatering
seepage failure
suspended cut-off wall
recharge well
作者简介
王同张（1989-）,男,江苏南京人,助理工程师,主要从事水运、路桥建设管理工作.
