南京江北新区中心区地下空间一期基坑涌水事故处理与启示  

Treatment and analysis of the foundation pit water inrush incident in Nanjing Jiangbei New District

作　　者：吉泳安 孟舰 JI Yongan;MENG Jian(Nanjing Darcy Geotechnical Engineering Co., Ltd., Nanjing Jiangsu 210000, China)

机构地区：[1]南京达西岩土工程有限公司,江苏南京210000

出　　处：《探矿工程（岩土钻掘工程）》2020年第7期94-99,共6页Exploration Engineering:Rock & Soil Drilling and Tunneling

摘　　要：南京江北新区中心区地下空间一期基坑涌水事故是由于基坑内废桩孔回填封堵不密实,导致深部承压含水层中承压水击穿废桩孔,造成涌水的事故。事故发生后,采用混凝土回填反压涌水,后在桩孔内注浆封堵,但均未成功。之后经过调查和分析研究,确定采取降水方案,即降低深部承压水水位至涌水口以下,在无涌水的情况下进行注浆封堵。该降水封堵方案实施历时18天,成功地解决了涌水事故。本工程涌水事故的处理为类似工程提供了有益的经验。The foundation pit water inrush incident on the underground space first-stage works in the central area of the Jiangbei New District,Nanjing happened due to lack of compaction of the backfilling in the abandoned pile holes in the foundation pit,which caused the confined water in the deep pressurized aquifer to penetrate the abandoned pile holes,leading to the water inrush incident.After the incident,the holes were backfilled with concrete to counter water inrush,and then grouted to seal off.But none of them succeeded.Through investigation and analysis,the dewatering program was adopted,whereby the deep confined water level was lowered below the water inrush position and grout was injected to seal off without the gushing water.This dewatering program took 18 days to successfully resolve the water inrush incident,which can provide useful experience for similar projects.

关 键 词：基坑涌水 废桩孔涌水 深层承压水 涌水事故 降水 注浆封堵 

分 类 号：TU463[建筑科学—结构工程]