摘要
深基坑地连墙接缝渗漏隐患的精细探查是长期以来未能良好解决的工程难题,一旦处置不当易导致基坑施工过程出现大涌水、塌方甚至周围地表沉降等重大灾害。基于此,本文依托上海市域机场联络线一号风井工程,研究并提出利用综合孔中物探方法检测地连墙渗漏的方法。采用跨孔电阻率CT、跨孔弹性波CT、钻孔雷达三种方法相互印证、联合解译,探明四号基坑6处渗漏异常,与抽水试验结果一致,实现了协同指导基坑开挖前的补强作业。应用结果表明,综合孔中物探方法可有效降低单一物探方法的多解性问题,提高了对地连墙渗漏异常检测和识别的准确性。
The fine detection of the hidden danger of diaphragm wall leakage in deep foundation pits has long been a problem in engineering.Without proper handling,it can cause major disasters such as flooding,collapse and even surface settlement when digging a foundation pit.In view of this,a comprehensive borehole geophysical prospecting method is presented in this paper in order to detect diaphragm wall leakage based on the study of the No.1 air shaft project of the Shanghai regional airport connecting line.In combination with the different characteristics of cross-hole resistivity CT,cross-hole elastic wave CT and borehole radar,six leakage anomalies were detected in No.4 foundation pit.The results of the geophysical prospecting are consistent with those of the pumping test,which realizes the collaborative guidance of reinforcement before foundation pit excavation.The application results show that the comprehensive borehole geophysical prospecting method can effectively reduce the multi-solution problem of a single geophysical prospecting method,and improve the accuracy of detection and identification of leakage anomalies of diaphragm wall.
作者
盛灿军
SHENG Canjun(China Railway 24^(th) Bureau Group Co.Ltd.,Shanghai 200433,China)
出处
《铁道建筑技术》
2022年第4期46-51,共6页
Railway Construction Technology
基金
上海市科学技术委员会科研项目(19DZ1201005)。
关键词
孔中物探
综合探测
地下连续墙
渗漏
borehole geophysical prospecting
comprehensive detection
diaphragm wall
leakage
