上盖物业基坑开挖引起下方地铁隧道变形实测分析  

Field Measurement Analysis of Metro Tunnel Deformation Caused by Overhead Property Foundation Pit Excavation

作　　者：徐永刚 狄宏规[2] 刘欢 金宏杰 苏光北 邢宇 于佳永 XU Yonggang;DI Honggui;LIU Huan;JIN Hongjie;SU Guangbei;XING Yu;YU Jiayong(Ningbo Rail Transit Group Co.,Ltd.,315101,Ningbo,China)

机构地区：[1]宁波市轨道交通集团有限公司,宁波315101 [2]同济大学道路与交通工程教育部重点实验室,上海201804 [3]宁波轨道交通绿城东部置业有限公司,宁波315101

出　　处：《城市轨道交通研究》2022年第3期81-85,共5页Urban Mass Transit

摘　　要：基于宁波市矮潘地块项目施工期下方地铁隧道结构变形的实测数据,分析了周围基坑群施工对下卧隧道结构的影响。结果表明:隧道结构总体呈现先下沉、后上浮的趋势,上浮值先增大再减小后趋于稳定,上浮最大值出现在隧道上部基坑土体开挖完成之后、上部土体开挖期间;隧道结构横断面变形总体呈现“横鸭蛋”变形,隧道上部土体开挖时,隧道结构横断面变形呈现“竖鸭蛋”变形;及时对已开挖部分施作垫层、底板、压重等,可有效地控制下方隧道的变形。Based on the measured data of tunnel structure deformation of the underlying metro during the construction of Ningbo Aipan Plot project,the influence of the surrounding foundation pits excavation on the underlying tunnel structure is analyzed.The results show that the tunnel structure generally presents a trend of sinking first and then heaving.The value of tunnel heave increases first,then decreases,and finally tends to be stable.The maximum tunnel heave appears after the excavation completion of the upper foundation pit soil.During the excavation of upper soil,the tunnel heave deformation is the maximum.The tunnel cross section deformation generally presents the shape of a horizontal duck egg,while the shape deformation of a vertical duck egg occurs when tunnel upper part soil is excavated.The tunnel deformation can be effectively controlled by taking engineering measures such as cushion layer,floor,and weight-bearing on the excavated part in time.

关 键 词：地铁上盖物业 基坑开挖 隧道结构 沉降 收敛变形 

分 类 号：U456.32[建筑科学—桥梁与隧道工程]