密集城区超大直径盾构切削群桩对上部建筑物振动影响规律分析  

Analysis on the Vibration Influence on Upper Buildings Induced by Cutting of Pile Group by Extra-large-diameter Shield in Dense Urban Areas

作　　者：陈一凡 黄书华 沈翔 盛健[2] 陈湘生 张良[2] CHEN Yifan;HUANG Shuhua;SHEN Xiang;SHENG Jian;CHEN Xiangsheng;ZHANG Liang(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060;China Railway 14th Bureau Group Mega Shield Construction Engineering Co.,Ltd.,Nanjing 211800;Key Laboratory of Coastal Urban Resilient Infrastructures(Shen-zhen University),Ministry of Education,Shenzhen 518060;Key Laboratory of Green,Efficient and Intelligent Construction of Metro Underground Stations in Shenzhen,Shenzhen 518060)

机构地区：[1]深圳大学土木与交通工程学院,深圳518060 [2]中铁十四局集团大盾构工程有限公司,南京211800 [3]滨海城市韧性基础设施教育部重点实验室(深圳大学),深圳518060 [4]深圳市地铁地下车站绿色高效智能建造重点实验室,深圳518060

出　　处：《现代隧道技术》2024年第3期266-275,共10页Modern Tunnelling Technology

基　　金：广东省自然科学基金(2023A1515010060);国家自然科学基金(52378404,52108377)。

摘　　要：在城市中心区域修建盾构隧道时,遭遇既有建(构)筑物桩基础不可避免,然而直接切削桩基面临巨大风险。为了进一步揭示盾构直接切削桩基内在机理,以广州海珠湾隧道下穿中核商务大厦工程为例,根据现场实测振动数据,分析盾构磨桩诱发中核商务大厦振动响应的规律,并研究盾构磨桩过程中建筑物的倾斜程度。研究结果表明:盾构磨桩掘进时,建筑物以竖直振动为主;在建筑物内部,振动随传播距离的增长而迅速衰减,因此盾构施工振动的影响范围较小,以隧道中线为轴线约2D/3(D为盾构直径)的区域是重点影响范围,并且监测结果显示距离盾构隧道最近的第一层振动突变幅度为第二层突变幅度的2倍以上;振动幅度反映了建筑物的倾斜方向,可通过监测建筑物的振动变化来分析建筑物的倾斜方向。Construction of a shield tunnel in a central urban area will inevitably encounter the pile foundations of existing buildings or structures,but direct cutting of the pile foundation will impose enormous risks.In order to further reveal the internal mechanism of cutting of pile foundation by a shield,the case of the Haizhu Bay Tunnel cutting through the foundation of CNNC Business Building is used as an example in this study.The field measured vibration data is used to analyze the pattern of the vibration response of CNNC Business Building induced by the shield grinding the pile foundation,and to investigate the tilt of the building caused by the shield grinding the pile foundation.As the study results indicate:The building mainly experiences vertical vibration when the shield grinds the pile foundation.Inside the building,the vibration is quickly attenuated as its propagation distance increases,so the vibration induced by shield construction impacts only a small area.The area in 2/3D(D is the shield diameter)with the tunnel center line being the axis is the key impact area.As indicated by the monitoring results,the vibration catastrophe amplitude of the first floor,which is closest to the shield tunnel,is over 2 times the vibration catastrophe amplitude of the second floor.According to the study,the vibration amplitude will indicate the direction of tilt of the building,so the direction of tilt of the building can be analyzed by monitoring its vibration variation.

关 键 词：超大直径盾构 盾构施工 切削桩基 建筑物振动 现场监测 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]