近河涌基坑渗流破坏补救加固方法探索及应用

Remedial Reinforcement Methods for Seepage Damage in Foundation Pits Near Rivers and Streams

某近河涌基坑采用三轴水泥土搅拌桩帷幕止水,基坑开挖过程中发生涌水、涌砂渗流破坏,数次堵漏补救失败后,提出一种将双液注浆与旋喷桩相结合的双液旋喷桩施工工艺,解决了涌水涌砂问题,完成了止水补救加固,没有对基坑及周边环境造成不良影响,保障了基坑后续开挖施工的顺利进行。以该工程为例,介绍了该基坑渗流破坏的补救加固过程,总结了双液旋喷桩工艺的技术要点。

A riverbank foundation pit utilized a triaxial cement-soil mixed wall for water seepage prevention.During excavation,water gushing,sand effusion,and seepage destruction occurred.After several unsuccessful attempts at sealing and remediation,a combined technique of dual-liquid grouting with jet grouting piles was proposed.The issues of water and sand gushing were solved,and the remediation and reinforcement of the seepage control were accomplished,without adversely affecting the pit or its surrounding environment,thereby ensuring the continuation of subsequent excavation works.Taking this project as a case study,the process of remediation and reinforcement undertaken for the seepage damage of this foundation pit is outlined,and the technical key points of the dual-liquid jet grouting piles technique are summarized.