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深基坑突涌降压防控及降压井带压封堵技术研究

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基坑突涌会给基坑工程带来灾难性后果,深基坑突涌防控体系及相关技术研究具有重要意义.结合工程实例,分析了基坑突涌原因,搅拌桩止水帷幕底的绕底渗流和水平渗流是止水帷幕无法完全阻隔承压水的主要因素.通过现场降压井抽水试验重新获取了承压水地层渗透系数,分析了渗透系数增大的原因,基坑突涌防控设计应考虑承压水地层渗透系数增大的影响.介绍了深基坑突涌降压防控体系,该体系包括分级布置降压井、压重封底、分区开挖、快速封底及加强监控等内容,其中分级布置降压井是关键.研发了承压水降压井带压封堵技术,并在工程中运用.相关研究可为类似工程设计和施工提供参考.
Control of Water Intrusion and Pressure Reduction in Deep Excavation,as Well as Pressure Sealing Technology in Pressure Reduction Wells
The sudden water intrusion in the deep excavation can induce catastrophic consequences to project.The research on deep excavation water intrusion prevention and control system and related technologies is of great significance.Based on engi-neering case histories,the triggering factors of the sudden water intrusion the deep excavation are analyzed,and the main fac-tors that prevented the water curtain from completely blocking artesian groundwater are the seepage around the bottom and hor-izontal seepage at the bottom of the mixing column water stop curtain.The permeability coefficient of the confined water layer was obtained through in-situ depressurization well pumping tests.The reasons for the increase in permeability coefficient were analyzed.The design of the deep excavation groundwater intrusion prevention and control should consider the impact of the in-crease in permeability coefficient of the confined water layer.This article introduces the prevention and the control system for the sudden groundwater intrusion and the pressure reduction in deep excavations,which includes the graded layout of pressure reduction wells,weight sealing bottom,zoning excavation,rapid bottom sealing,and strengthened monitoring.Among them,the graded layout of pressure reduction wells is the key.Developed pressure reducing well sealing technology for the pressurized water and applied it in engineering.Related research can provide reference for similar engineering design and construction.

Deep ExcavationWater IntrusionPressure Reduction Prevention and ControlPressure Reduction WellsPres-sure Sealing

钟贵荣

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福建省建筑科学研究院有限责任公司,福州 350108

深基坑 突涌 降压防控 降压井 带压封堵

2024

土工基础
湖北省土木建筑学会,中国科学院武汉岩土力学研究所,武汉市土木建筑学会

土工基础

影响因子:0.238
ISSN:1004-3152
年,卷(期):2024.38(6)