超大直径浅埋盾构隧道施工期管片结构力学响应研究  

Study on the Mechanical Response of Tunnel Segment Structures in Ultra-large Diameter Shallow-buried Shield Tunnels during Construction

作　　者：万东兴 张迪[2] 孙峰[2] 潘辰昕 朱振伟 徐晓峰 何超 申屠琪 WAN Dongxing;ZHANG Di;SUN Feng;PAN Chenxin;ZHU Zhenwei;XU Xiaofeng;HE Chao;SHEN Tuqi(Hangzhou Fuyang Urban Construction Investment Group Co.,Ltd.,Hangzhou 311400;China Railway Siyuan Survey and Design Institute Group Co.,Ltd.,Wuhan 430063;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058)

机构地区：[1]杭州富阳城市建设投资集团有限公司,杭州311400 [2]中铁第四勘察设计院集团有限公司,武汉430063 [3]浙江大学建筑工程学院,杭州310058

出　　处：《现代隧道技术》2025年第1期135-146,共12页Modern Tunnelling Technology

摘　　要：为探明超大直径浅埋盾构隧道在施工期复杂荷载作用下管片结构的力学响应,以秦望通道为工程背景,综合考虑施工荷载组合情况和边界条件,建立三维精细化计算模型,对不同注浆压力和不同浆液凝固时间条件下施工期隧道管片的纵向上浮、环间错台、横向变形、纵向内力和损伤情况进行对比分析。研究结果表明:管片拱顶和拱底上浮量均随注浆压力的增大和浆液凝固时间的延长而增大,浆液凝固时间对管片上浮的影响更显著;管片错台变化可分为上错台段、过渡段、下错台段和平稳段;管片最大错台量出现在盾构段与流体段连接处和流体段与成型段连接处;与流体段管片相比,盾构段和成型段前半段管片更容易发生横向变形,且随注浆压力增大而增大;管片拉损伤集中于流体段隧道外侧拱肩处以及隧道内侧拱腰以下45°处。To explore the mechanical response of tunnel segment structures under complex loads during the con⁃struction of ultra-large diameter shallow-buried shield tunnels,this study uses the Qinwang River-crossing project as the engineering background.A three-dimensional refined calculation model was established considering the con⁃struction load combinations and boundary conditions.The model was used to analyze and compare the longitudinal uplift,circumferential misalignment,lateral deformation,longitudinal internal forces,and damage conditions of the tunnel segments under different grouting pressure and grout setting time conditions.The results show that:(1)The uplift of both the crown and the invert arch of the tunnel segment lining ring increases with the increase in grouting pressure and the extension of the grout setting time,with the grout setting time having a more significant impact on the uplift.(2)The misalignment of the segment can be divided into the upper misalignment section,transition sec⁃tion,lower misalignment section,and the stable section.The maximum misalignment occurs at the junction between the segments in shield shell section and in the fluid grout section,and between the segments in the fluid grout sec⁃tion and in the set grout section.(3)Compared to the segments in the fluid grout section,the segments in the shield shell section and the front half of segments in the set gout section are more prone to lateral deformation,which in⁃creases with the grouting pressure.(4)The tensile damage in the segments concentrates on the outer spandrel of seg⁃ments in the fluid grout section and at 45°below the inner waist of the tunnel.

关 键 词：超大直径 盾构隧道 管片上浮 环间错台 数值模拟 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]