深厚强透水地层基坑开挖涌水事故处置及原因分析  

Mitigation and Cause Analysis of Water Gushing Hazard in Deep Excavation in Thick and Strong Permeable Soils

作　　者：赵琪琪 ZHAO Qiqi(Shanghai Tunnel Engineering Co.Ltd.,Shanghai 200232)

机构地区：[1]上海隧道工程有限公司,上海200232

出　　处：《土工基础》2024年第1期20-23,共4页Soil Engineering and Foundation

摘　　要：以福州某在建地铁车站为例,阐述了基坑开挖过程中出现涌水事故的处置过程及原因,得出如下结论与建议:深厚强透水地层具有水量大、渗透性强的特点,坑底已做封底加固致使加固层下方水层具有承压性,基坑开挖在满足承压水抗突涌稳定性要求的前提下,施工前应通过抽水试验充分考虑加固层是否存在薄弱部位,开挖过程中需保证降水井的正常运行,出现涌水事故能够防止险情扩大。若监测数据变化较大应及时进行覆土回填,保证基坑安全,回填后对涌水部位封堵注浆,确保险情得到控制再进行开挖。This paper presents the treatment process and causes analysis of the water gushing hazard in the process of a deep excavation in a subway station construction in Fuzhou.The lessons learned are as follows:Thick and strong permeable stratum has the characteristics of the large water volume and the strong permeability.The bottom of the excavated area has been sealed and reinforced,so that the water layer below the reinforcement layer has pressure bearing.On the basis of meeting the stability requirements of the artisan water against the sudden surge,the deep excavation should fully consider whether there are weak parts in the reinforcement layer through pumping test before construction.During the excavation process,the normal operation of the dewatering well should be ensured,and the occurrence of the water gushing hazard can prevent the expansion of the hazard.If the monitoring data changes greatly,the earth covering and backfilling should be conducted in time to ensure the safety of the excavated area.After the backfilling,the water gushing part should be blocked and grouted to ensure that the safety situation is controlled before the excavation.

关 键 词：涌水事故 强透水地层 承压水 

分 类 号：TU473[建筑科学—结构工程]