摘要
北京城市副中心站综合交通枢纽工程超大基坑深达32 m,基坑东西长达1.8 km,基坑开挖施工过程中防渗控水是其最富有挑战的问题。本文针对副中心站深大基坑多层含水层条件和支护结构、帷幕结构的特点,采用理论分析方法,揭示了该类超大深基坑的渗流特征,提出了适用该类地层的精准涌水量计算方法,并确定其渗流量。通过深大基坑疏排水总量估算与基底抗突涌验算,综合提出了坑内疏干与基底承压含水层减压相结合的控水措施,保障了该类超大深基坑工程的安全施工。
The ultra-large foundation pit of the Beijing Sub-Central Comprehensive Transportation Hub Project is 32 m deep and 1.8 km long from east to west.Seepage prevention and water control are the most challenging issues during the foundation pit excavation.Based on the multi-layer aquifer conditions and the characteristics of the supporting and curtain structures,theoretical analysis is used in this paper to investigate the seepage characteristics of the ultra-large foundation pit,the evaluation of water inflow which is suitable for this type of strata is proposed and its seepage quantity is determined.Moreover,check calculations of total water inflow and anti-surge at the bottom of deep foundation pit are carried out,the water control measures that combine the dewatering and pit drainage are proposed comprehensively,which ensures the safe construction of ultra-large deep foundation pits.
作者
王硕
WANG Shuo(China Railway Construction Group Co.Ltd.,Beijing 100040,China)
出处
《铁道建筑技术》
2024年第3期176-178,213,共4页
Railway Construction Technology
基金
中国铁建股份有限公司科技研发计划项目(2022-B14)。
关键词
副中心站
超大深基坑
非线性渗流
疏干减压
控水对策
Beijing Sub-Center Railway Station
ultra-large deep foundation pit
nonlinear seepage
dewatering and pit drainage
water control measures
作者简介
王硕(1982-),男,辽宁大连人,高级工程师,硕士,主要从事铁路站房施工技术管理工作,E-mail:565008261@qq.com。
