南宁市某地铁车站基坑涌水原因分析及处理措施

Analysis and Treatment of the Water Gushing of Foundation Excavation for a Subway Station in Nanning

以南宁市某地铁车站基坑涌水事故为例,分析了深基坑发生涌水的原因并介绍了相应处理措施。研究结果表明,该基坑涌水的原因是多方面的,主要是基坑底存在承压水且承压水水头较高。事故发生后,现场人员采取紧急堵漏措施,同时采用注浆法加固基坑底土体,改善岩土体性质,最后水流得到控制,各项监测指标已稳定,保证了工程的顺利完成。处理结果表明,注浆法加固基坑底土体是承压水较大情况下基坑安全开挖的有效方式。

Based on an accident about the water gushing of foundation excavation for a subway station in Nanning,this paper analyzes the reasons and introduces the corresponding treatment measures. Research results show that the reason of water gushing is various,mainly because of the existence of confined water at the bottom of the deep foundation excavation soil,and confined water head is larger. After the accident happens,the field staff took emergency measures to leak stoppage,at the same time,the grouting method was used to reinforce the foundation excavation bottom soil,which improved geotechnical liquid property,the flow was controlled at last,the monitoring indicators were stable,and the project was completed. The treatment results show that grouting method which reinforces the soil of foundation excavation is an effective way to ensure foundation excavation safety when confined water head is larger.