盾构隧道下穿不同基桩数量群桩基础施工影响  

Construction Influence of Pile Group Foundation with Different Number of Foundation Piles Undercrossed by Shield Tunnel

作　　者：汤劲松 张宝 赵书银[3] 姜景双 TANG Jinsong;ZHANG Bao;ZHAO Shuyin;JIANG Jingshuang(Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education(Shijiazhuang Tiedao University),Shijiazhuang,Hebei 050043,China;Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;China Railway 16th Bureau Group Co.Ltd,Beijing 100018,China;China Railway 16th Bureau Group Beijing Metro Engineering Construction Co.Ltd,Beijing 101149,China)

机构地区：[1]道路与铁道工程安全保障省部共建教育部重点实验室(石家庄铁道大学),石家庄050043 [2]石家庄铁道大学,石家庄050043 [3]中铁十六局集团有限公司,北京100018 [4]中铁十六局集团北京轨道交通工程建设有限公司,北京101149

出　　处：《铁道工程学报》2022年第11期94-99,共6页Journal of Railway Engineering Society

基　　金：河北省自然科学基金资助项目(E2014210021)。

摘　　要：研究目的:在盾构隧道下穿群桩基础的施工过程中,不同大小的承台面积和基桩数量,对于盾构下穿群桩基础有什么影响,是地铁隧道施工中值得关注的问题之一。为探究盾构隧道下穿施工对不同大小承台和不同数量基桩群桩基础的影响,以低承台摩擦型群桩基础为研究对象,分析盾构隧道正向下穿和侧向下穿不同大小承台群桩基础的承台沉降和倾斜规律,以及侧向下穿时的承台水平位移。研究结论:(1)盾构隧道下穿群桩基础时,同一水平间距条件下,承台顶中心位置沉降均随着承台面积和基桩数的增大而增大,而对承台倾斜度影响差别不大;(2)侧向下穿时,承台水平位移随着承台面积和基桩数的增大而增大;(3)当水平间距小于2倍洞径,特别是盾构隧道正向下穿群桩基础时,承台大小和基桩数对群桩基础的沉降影响较大,群桩效应较为明显;(4)本研究成果可为盾构隧道下穿群桩基础的设计与施工提供借鉴和参考。Research purposes: During the construction process of pile group foundations undercrossed by shield tunnel, what impact to pile group foundation with different area of foundation caps and different number of foundation piles is a concern problem to construction of metro tunnel. In order to explore the influence of shield tunnel underpass construction on pile foundations of different sizes of caps and different number of foundation piles, the low cap and friction pile group foundation was taken as the research object. The settlement and inclination law of cap were analyzed for different sizes of pile caps undercrossed by shield tunnel directly and laterally, as well as the horizontal displacement of the cap were analyzed when shield laterally passes under pile group foundation.Research conclusions:(1) When shield tunnel pass under pile group foundation with the same horizontal spacing, the settlement of center position of the top of cap increases with the increase of area of cap and the number of foundation piles, and there is little difference in the impact of inclination of cap.(2) When shield tunnel laterally underpasses pile group foundation, the horizontal displacement of cap increases with the increase of area of cap and the number of foundation piles.(3) When the horizontal spacing is less than 2 times of tunnel diameter, especially shield tunnel directly passes under pile group foundation, the size of cap and the number of foundation piles has a greater impact on the settlement of pile group foundation, and the pile group effect is more obvious.(4) The research results can provide reference for design and construction of pile group foundation undercrossed by shield tunnel.

关 键 词：盾构隧道 下穿施工 群桩基础 承台大小 基桩数量 

分 类 号：U231.3[交通运输工程—道路与铁道工程] U455.43[建筑科学—桥梁与隧道工程]