摘要
通过武汉绿地中心深基坑群井抽水试验,探讨武汉长江一级阶地地区落底式止水帷幕条件下深基坑涌漏的组成及其渗流规律,并提出了新的数学模型,计算基坑侧壁涌漏量。试验及分析计算结果表明:落底式止水帷幕条件下深基坑涌水量的组成除封闭基坑内含水层所含孔隙水之外,还有基坑侧壁的涌漏和基坑底部涌漏两部分,其中以基坑底部涌漏为主。基坑底部涌漏又包括基岩裂隙水和以基岩裂隙为通道绕渗补给的孔隙水。在涌漏初期地下水通过基坑侧壁涌漏点进入坑内时,在水平方向上以某一弧度的扇形模式扩散;基坑底部基岩裂隙水及坑外地下水通过基岩裂隙通道垂直向上补给。当存在涌漏点时,基坑内外水位变化会出现明显的异常。
Based on the systematic pumping test data near the deep foundation pit in the International City of Wuhan Greenland, the sealing effects of drop waterproof curtains in the terrace area along the Yangtze River in Wuhan and the permeability features affected by sealing are evaluated, and the optimum calculating method of water yield are proposed. The results of test and analyses show that by analyzing the abnormal value of inside and outside water levels, the leak source of the waterproof curtain can be inferred. The seepage direction from outside to inside of the foundation pit at the initial stage of the water recovery is speculated to be a sector based on the water level data. The leakage is not just from the defect of the curtain, the main part is from the flow around the bottom and the bedrock fissure water. At the beginning of the dewatering, groundwater flows into the pit through the curtain, and in the horizontal direction the groundwater diffuses like a fan. Groundwater supplies up from the bottom of the foundation. If there are leakage points, the water level will show abnormal.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2016年第6期107-112,共6页
Hydrogeology & Engineering Geology
基金
武汉市城乡建设委员会科技计划项目(201543)
关键词
基坑降水
落底式止水帷幕
群井试验
渗流规律
基坑涌漏
dewatering engineering
drop waterproof curtain
well group pumping test
seepage field
foundation pit water leakage
作者简介
冯晓腊（1964-），男，博士，教授，主要从事水文地质与工程地质、岩土工程等教学、科研、生产工作。E-mail：18317108@qq．com
