摘要
承压水抽降是深基坑工程面临的主要难题之一。群井抽水试验是合理分析基坑工程承压水水位降深和地表沉降的主要手段,具有重要意义。以上海某航站楼区域大规模深基坑现场抽水试验为例,结合场地工程地质和水文地质条件,对群井抽水过程中承压水水位变化及地表沉降进行分析,探究承压水水位降深对地层压缩及地表沉降的影响规律。结果表明:300 m监测范围内,地面沉降最大值为104.9 mm,最大水位降深为21.85 m,每米水位降深(即单位水位降深)引起的地面沉降量约为5 mm;(7)层的最大土层压缩量为68.4 mm,单位水位降深引起的压缩量约为3 mm;单位水位降深引起的地面沉降量随距离增加有减小的趋势,距离中心40~310 m范围内,单位水位降深引起的地面沉降量为4.22~1.17 mm。
Pumping of confined water is one of the main problems faced by deep foundation pit engineering.And group well pumping test is the main method to reasonably analyze the drawdown of confined water and surface settlement around foundation pit engineering,which is of great significance.A large-scale deep foundation pit pumping test in the area of a terminal in Shanghai was selected as an example in this study.Combined with the engineering geology and hydrogeological conditions of the site,the confined water level change and surface settlement during the group well pumping tests were analyzed.The influence of the drawdown of confined water on soil layer compression and ground settlement were investigated.The results showed that within the monitoring range of 300 m,the maximum ground settlement was 104.9 mm,the maximum drawdown was 21.85 m,and the ground settlement caused by the drawdown per meter was about 5mm.The maximum compression of 7th soil layer was 68.4 mm,and the compression caused by one meter of drawdown was about 3 mm.The ratio of settlement to drawdown tended to decrease with the increase of distance,and within the range of 40-310 m from the center,the ratio of settlement to drawdown was 4.22-1.17 mm.
作者
兰韡
王卫东
常林越
LAN Wei;WANG Wei-dong;CHANG Lin-yue(Shanghai Underground Space Research Institute in Arcplus China Co.,Ltd.,Shanghai 200000,China;Shanghai Shenyuan Geotechnical Engineering Co.,Ltd.,Shanghai 200040,China;East China Architectural&Design Institute Co.,Ltd.,Shanghai 200002 China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2022年第10期2898-2910,共13页
Rock and Soil Mechanics
关键词
深基坑
承压水
群井抽水
水位降深
沉降
压缩量
deep foundation pit
confined water
group well pumping
drawdown
settlement
compression
