邻地铁盾构隧道超长基坑支护技术——以杭州大会展中心基坑工程为例  

Support technology of super-long foundation pit near subway in soft soil area——Taking the Hangzhou Exhibition Center as an example

作　　者：马少俊[1] 王乔坎 苏凤阳 徐建章 郑伟[4] 陈思源[1] Ma Shaojun;Wang Qiaokan;Su Fengyang;Xu Jianzhang;Zheng Wei;Chen Siyuan(Zhejiang Province Institute of Architectural Design and Research,Hangzhou 310006,China;Hangzhou Metro Group Co.Ltd,Hangzhou 310003,China;Zhejiang Dadong Group Construction Co.Ltd,Huzhou 313002,China;Hangzhou Architectural Design and Research Co.Ltd,Hangzhou 310000,China)

机构地区：[1]浙江省建筑设计研究院,浙江杭州310006 [2]杭州市地铁集团有限责任公司,浙江杭州310003 [3]浙江大东吴集团建设有限公司,浙江湖州313002 [4]杭州市建筑设计研究院有限公司,浙江杭州310000

出　　处：《建筑科学》2022年第5期179-186,共8页Building Science

基　　金：浙江省建设科研项目-邻近危旧房屋的基坑工程微变形控制技术及智慧化工地系统平台研究(2020K007);杭州市建设科研项目-新型绿色微扰动基坑支护技术及智慧化工地系统平台研发(2020010)。

摘　　要：以杭州大会展中心工程为背景,根据本基坑工程超长超大、紧邻地铁盾构隧道的特点,采用了“分坑”、“门式加固”和“精细化分区开挖”等多种变形控制技术措施。通过Midas GTS NX建立三维有限元数值模型,一方面分析了双侧基坑按照对称和非对称两种开挖顺序对邻近盾构隧道的影响特征,另一方面分析了连通道基坑开挖对下卧盾构隧道的影响。结果表明,当距离盾构隧道大于1~2倍开挖深度时,采用非对称的开挖方式有利于盾构隧道的变形控制。对于大体量的盾构隧道上方卸载,采用“门式加固”、“精细化分区开挖”及“信息化配重反压”措施,对盾构隧道的隆起变形控制效果较好。Taking the Hangzhou Exhibition Center as the background, according to the characteristics of the foundation pit project, which is extra-long and extra-large, and is adjacent to the subway shield tunnel, various deformation control technology measures, such as "divided pit", "gate reinforcement" and "fine zoning excavation", are adopted. The 3D finite element numerical model is established by Midas GTS NX. On the one hand, the influence characteristics of the double-sided foundation pits excavated in symmetrical and asymmetrical order on the adjacent shield tunnels are analyzed, and on the other hand, the influence of continuous tunnel excavation on underlying shield tunnel is analyzed.The results show that when the distance from the tunnel is greater than 1~2 times the excavation depth, the asymmetric excavation method is beneficial to the deformation control of the shield tunnel. For the unloading above the large-scale shield tunnel, the measures of "gate reinforcement", "fine zoning excavation" and "information-based counterweight back pressure" are used to control the uplift deformation of the shield tunnel.

关 键 词：超长超大基坑 盾构隧道 开挖顺序 三维数值模拟 

分 类 号：TU47[建筑科学—结构工程]