摘要
依托宁波地铁6号线某区间曲线盾构隧道下穿既有车站工程实例,基于Midas GTS NX软件进行三维数值建模,模拟隧道下穿施工全过程,分析上部车站底板、隧道结构、地表变形变化规律。基于数值计算结果对曲线隧道下穿施工安全进行评价,提出变形控制措施。研究结果表明,曲线盾构隧道施工时由于内侧超挖造成更大的地层损失,对车站底板沉降造成叠加影响,隧道开挖完成后车站底板最大沉降位于双线隧道中心;左线隧道开挖完成时,竖向收敛变形呈中间小、两端大的分布特点,且右线隧道施工对左线隧道竖向收敛变形的影响较小;曲线隧道下穿施工引起的地表沉降变形主要集中在双线隧道中心两侧25m范围内;通过采取必要的变形控制措施,可使结构变形处于安全范围内。
Based on the engineering example of a curve shield tunnel of Ningbo Subway Line 6 undercrossing an existing subway station,three-dimensional numerical simulation was carried out based on Midas GTS NX software,the whole construction process of tunnel undercrossing was simulated,and deformation characteristics of the upper station floor,tunnel structure and ground surface were analyzed.Based on the numerical calculation results,the construction safety of curve shield tunnel undercrossing is evaluated,and the deformation control measures are put forward.The research results show that during the curve shield tunnel construction,the ground loss caused by the ove excavation of the inner side is greater,which has a superimposed impact on the settlement of the station floor,and the maximum settlement of the station floor is located at the center of the double-line tunnel when the tunnel excavation is completed.When the excavation of the left line tunnel is completed,the vertical convergence deformation is smaller in the middle and larger on both sides,the construction influence of the right tunnel on the vertical convergence deformation of the left tunnel is smaller.The surface settlement caused by the undercrossing construction by the curve shield tunnel is mainly concentrated within 25m away from the center of the double-line tunnel.By taking necessary deformation control measures,the structure deformation can be kept within the safe range.
作者
黄毅
何健
张家硕
畅继鹏
李俊华
黄强
HUANG Yi;HE Jian;ZHANG Jiashuo;CHANG Jipeng;LI Junhua;HUANG Qiang(Construction Branch,Ningbo Rail Transit Group Co.,Ltd.,Ningbo,Zhejiang 315101,China;School of Civil&Environmental Engineering and Geography Science,Ningbo University,Ningbo,Zhejiang 315211,China)
出处
《施工技术（中英文）》
CAS
2024年第21期71-77,共7页
Construction Technology
基金
宁波市自然科学基金项目(2023J083)。
关键词
地铁
车站
隧道
沉降
数值模拟
subways
stations
tunnels
settlement
simulation
