南京某泵站基坑涌水事故处理  

Treatment of Water Gushing Accident in Foundation Pit of a Pumping Station in Nanjing

作　　者：王钰 关自愿 WANG Yu;GUAN Ziyuan(Jiangsu Guzhou Foundation Engineering Co.,Ltd,Nanjing Jiangsu 210000 China)

机构地区：[1]江苏固洲基础工程有限公司,江苏南京210000

出　　处：《江苏建筑》2024年第3期139-142,共4页Jiangsu Construction

摘　　要：深基坑施工过程中,由于对地下水控制的认识不足,导致深基坑涌水时有发生。南京某泵站项目最大开挖深度16.9 m,开挖至13 m深时出现涌水。涌水发生后,施工方第一时间采取了基底加固措施,但是在巨大的水头压力下,注浆加固效果欠佳,涌水未得到解决。后来决定采用降水措施处理。先施工3口降水井,进行了抽水试验,试验结果为含水层渗透系数可达30.26 m/d,透水性强。然后利用数值法,建立三维地下水流数值模型,计算所需降水井数,共布设了18口坑外降水井。降水井施工并抽水后,将水位降至坑中坑底以下,快速完成了底板施工,成功处理了险情。可为类似项目提供参考。In the process of deep foundation pit construction,due to the lack of understanding of groundwater control,deep foundation pit water inrush accidents occur from time to time.The maximum excavation depth of the pumping station project in Nanjing was 16.9 m,and water gushing occurred when it was excavated to a depth of 13 m.After the accident,the construction side took the base reinforcement measures at the first time,but under the huge head pressure,the grouting reinforcement effect was not good,and the water gushing was not solved.Later,dewatering measures were introduced.Three dewatering wells were constructed first,and the pumping test was carried out.The test results show that the permeability coefficient of the aquifer can reach 30.26 m/d,which means permeability is strong.Then,based on the numerical method,a three-dimensional groundwater flow numerical model was established to calculate the number of dewatering wells required,and a total of 18 dewatering wells outside the pit were laid.After the dewatering wells were constructed and pumped,the water level was lowered below the bottom of the pit,and the floor construction was quickly completed,which indicated that the danger was successfully dealt with.It can provide reference for similar projects.

关 键 词：深基坑 泵站 涌水事故 降水设计 

分 类 号：TU463[建筑科学—结构工程]