地铁隧道双洞交叉穹拱形地下结构受力特点分析  

Analysis of the Stress Characteristics at the Dome Type Metro Tunnel Intersection

作　　者：王明法 刘国山 闫建权 满新杰 李洪泽 周洋洋 李为腾[2] 郭光明 邵行 姜维亮 WANG Mingfa;LIU Guoshan;YAN Jianquan;MAN Xinjie;LI Hongze;ZHOU Yangyang;LI Weiteng;GUO Guangming;SHAO Xing;JIANG Weiliang(Shandong Expressway Infrastructure Construction Co.,Ltd.,Jinan 250000;Shandong University of Science and Technology,Qingdao 266590;Shandong Provincial Transportation Planning and Design Institute Group Co.,Ltd.,Jinan 250101)

机构地区：[1]山东高速基础设施建设有限公司,济南250000 [2]山东科技大学,青岛266590 [3]山东省交通规划设计院集团有限公司,济南250101

出　　处：《现代隧道技术》2025年第1期157-169,共13页Modern Tunnelling Technology

基　　金：山东省自然科学基金(ZR2022ME212).

摘　　要：以某地铁车站为研究对象,采用模型试验、数值模拟及现场监测等方法,对比分析车站风道进入主体隧道交叉段单向拱与穹拱(双向拱)两种洞型下围岩及支护结构受力特征。研究发现:穹拱形结构更有利于隧道稳定,相较于单向拱结构围岩沉降量减少约7%,对围岩扰动范围更小;内拐角围岩应力状态呈现“三向—两向—单向”的变化趋势,且产生裂隙,需重点关注;喷层拉应力最大值为0.11MPa,位于交叉段内拐角和交叉段—主体交叉截面位置处;下台阶开挖时风道与主体隧道的中空注浆锚杆轴力降低,而交叉段预应力锚杆几乎不受影响,且此段拱架受力明显不对称,靠近主体隧道侧拱架局部受拉。基于以上研究,提出先架设内套钢架再破除原支护钢架的“先支后破”工法,现场监测结果显示穹拱形隧道最大沉降约为5.2mm,支护结构受力均在安全范围内,隧道整体稳定。Taking a certain subway station as the research object,this study employs model testing,numerical simu⁃lation,and on-site monitoring to conduct a comparative analysis of the stress characteristics of surrounding rock and support structures under two tunnel structure forms:the unidirectional arch and the dome(bidirectional arch)at the intersection section of the station's air duct and the main tunnel.The research findings indicate that the dome shape is more conducive to tunnel stability,with surrounding rock settlement reduced by approximately 7%compared to the unidirectional arch,and a smaller disturbance range to the surrounding rock.The stress state of the surrounding rock at the inner corner exhibits a trend of"three-dimensional-two-dimensional-one-dimensional"changes,leading to the formation of cracks that require close attention.The maximum tensile stress in the sprayed concrete layer is 0.11 MPa,located at the inner corner of the intersection and at the cross-section between the intersection section and main tunnel.During the excavation of the lower bench,the axial force of the hollow grouting anchor bolts in the air duct and the main tunnel decreases,while the prestressed anchor bolts in the intersection section are almost unaf⁃fected.Additionally,the stress on the steel arch in this section is significantly asymmetric,with localized tensile stress occurring in the steel arch near the main tunnel side.Based on these findings,a"support first,break later"construction method is proposed,which involves first erecting an inner steel arch before dismantling the original steel arch support.On-site monitoring shows that the maximum settlement of the dome-shaped tunnel is approxi⁃mately 5.2 mm,and the stress on the support structure remains within a safe range,ensuring the overall stability of the tunnel.

关 键 词：交叉隧道 穹拱 受力特点 主动支护 变形 

分 类 号：U455[建筑科学—桥梁与隧道工程]