地铁车站深基坑近接施工安全控制研究  

Safety Control of a Subway Station Deep Excavation Construction

作　　者：黄振科 曹珂 谢俊[1] HUANG Zhenke;CAO Ke;XIE Jun(Urban Rail and Underground Engineering Design and Research Institute,China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司城市轨道与地下工程设计研究院,武汉430063

出　　处：《土工基础》2024年第3期399-403,共5页Soil Engineering and Foundation

基　　金：国家重点研发计划项目(2019YFC0605104);中铁建科研项目(2020-B17);铁四院科研项目(2022K005)。

摘　　要：依托某富水圆砾地层地铁车站基坑,探究明挖深基坑近接施工安全控制。根据近接施工中涉及的新建工程、新建工程与既有工程之间的岩土体、既有工程全过程预加固思路,采取针对性加固措施控制基坑近接施工对周边环境的影响:(1)新建地铁基坑采用“地连墙+内支撑”围护结构体系及袖阀管注浆水平封底地下水控制措施;(2)临近地铁基坑市政高架桥桩基进行预加长,承台周边预留注浆管,桩基与明挖基坑间施作旋喷隔离桩;(3)地铁基坑与临近小区基坑之间设置钻孔灌注隔离桩兼小区基坑围护桩。实践表明,研究思路及采取的预加固措施是有效的,达到了很好的安全控制效果。该工程可为后续明挖基坑近接施工类似案例提供借鉴和参考。This paper presents a case history of the safety control of a deep excavation of a subway station in the saturated grav-el stratum.Based to the pre-reinforcement ideas for the entire process of the new structures,the rock and soil mass between the new structures and the existing structures,the existing structures involved in the adjacent construction and the targeted rein-forcement measures are adopted to minimize the influence of the adjacent deep excavation construction on the surrounding envi-ronment:1)The new subway foundation excavation supporting system adopts the"diaphragm wall+internal support"retai-ning structure system and the groundwater control measures of sealing the bottom with the Sleeve Valve Pipe Grouting Meth-od;2)The municipal viaduct pile foundation near the subway station is pre-extended,the grouting pipe is reserved around the pile cap and the jet grouting isolation pile is applied between the piles and the cut and cover foundation;3)bored cast-in-place concrete piles are installed between the subway excavated area and the adjacent area.The results of deep excavation supporting system show that the method used,and the pre-reinforced measures are effective and achieve a good safety control effect.The project can provide a reference for the similar projects of the future deep excavation construction.

关 键 词：近接施工 明挖基坑 地铁 安全控制 

分 类 号：TU473[建筑科学—结构工程]