高承压水地层深基坑抗突涌技术  

Anti-inrush technology for deep base pit in high confined water stratums

作　　者：张光辉[1] 刘云凯 卢春雨 任一青 陈保国[2] ZHANG Guanghui;LIU Yunkai;LU Chunyu;REN Yiqing;CHEN Baoguo(Sinohydro Bureau 7 Co.,Ltd.,Chengdu 610081,Sichuan,China;School of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,Hubei,China)

机构地区：[1]中国水利水电第七工程局有限公司,四川成都610081 [2]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《工程建设》2024年第7期28-33,共6页Engineering Construction

基　　金：中国水利水电第七工程局有限公司科技攻关项目(GSSC-科研-2023-001)。

摘　　要：为了防止高承压水地层深基坑突涌破坏,以韩江-榕江-练江水系连通后续优化工程GX12号井深基坑为依托,采用有限元软件建立三维数值模型,对考虑地连墙深度以及布设减压井的5种技术方案进行模拟分析,研究各方案的抗突涌效果,并通过综合考虑基坑抗突涌效果及地连墙施工技术难度和工程造价等,确定基坑工程抗突涌的优化方案。结果表明:1)地连墙深度可由原设计的91.8m优化为78m;2)坑内增设减压井可有效减小坑底隆起和地连墙水平位移,但是增加了基坑周边地表沉降,而增加地连墙深度可显著减小基坑周边地表沉降和坑底隆起;3)增大地连墙深度的抗突涌效果优于增设减压井的效果。本文成果可为类似高承压水地层深基坑工程抗突涌技术提供一定的借鉴。In order to prevent the inrush damage of deep base pit in high confined water stratums,relying on the deep base pit of Well GX12 of the follow-up optimization project of Hanjiang-Rongjiang-Lianjiang water system connection,the three-dimensional numerical model is established by finite element software,and five technical schemes considering the depth of the slurry wall and the laying of the pressure reducing well are simulated and analyzed,the anti-inrush effect of each scheme is studied,and the optimization scheme of anti-inrush of base pit engineering is determined by comprehensively considering the anti-inrush effect of the base pit,the technical difficulty of the construction of the slurry wall and the engineering cost.The results show that:1)The depth of the slurry wall can be optimized from the original design of 91.8 m to 78 m;2)The addition of a pressure reducing well in the base pit can effectively reduce the horizontal displacement of the pit bottom uplift and the slurry wall,however,the surface settlement around the base pit is increased,and the surface settlement and pit bottom uplift can be significantly reduced by increasing the depth of the slurry wall;3)The anti-inrush effect of increasing the depth of the slurry wall is better than that of increasing a pressure reducing well.The results can provide some reference for the anti-inrush technology of deep base pit engineering in similar high-confined water stratums.

关 键 词：深基坑 超深地连墙 承压水 抗突涌 减压降水 

分 类 号：TV223[水利工程—水工结构工程]