理論研究 2024年 第53卷 第21期

DOI: 10. 7672 / sgjs2024210071

曲線盾構(gòu)隧道下穿施工影響分析

黃毅1,何健1,張家碩1,暢繼鵬1,李俊華2,黃強2

作者簡介：

黃毅，高級工程師，E?mail:huangy@ nbmetro. com

作者單位：

1.寧波市軌道交通集團有限公司建設(shè)分公司，浙江寧波 315101;2.寧波大學土木工程與地理環(huán)境學院，浙江寧波 315211

基金項目：

?寧波市自然科學基金項目（2023J083）

摘要：

依托寧波地鐵 6 號線某區(qū)間曲線盾構(gòu)隧道下穿既有車站工程實例，基于 Midas GTS NX 軟件進行三維數(shù)值建模，模擬隧道下穿施工全過程，分析上部車站底板、隧道結(jié)構(gòu)、地表變形變化規(guī)律。基于數(shù)值計算結(jié)果對曲線隧道下穿施工安全進行評價，提出變形控制措施。研究結(jié)果表明，曲線盾構(gòu)隧道施工時由于內(nèi)側(cè)超挖造成更大的地層損失，對車站底板沉降造成疊加影響，隧道開挖完成后車站底板最大沉降位于雙線隧道中心；左線隧道開挖完成時，豎向收斂變形呈中間小、兩端大的分布特點，且右線隧道施工對左線隧道豎向收斂變形的影響較?。磺€隧道下穿施工引起的地表沉降變形主要集中在雙線隧道中心兩側(cè) 25m 范圍內(nèi)；通過采取必要的變形控制措施，可使結(jié)構(gòu)變形處于安全范圍內(nèi)。

English：

Based on the engineering example of a curve shield tunnel of Ningbo Subway Line 6undercrossing an existing subway station, three?dimensional numerical simulation was carried out basedon Midas GTS NX software, the whole construction process of tunnel undercrossing was simulated, anddeformation 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 isevaluated, and the deformation control measures are put forward. The research results show that duringthe curve shield tunnel construction, the ground loss caused by the ove excavation of the inner side isgreater,which has a superimposed impact on the settlement of the station floor, and the maximumsettlement of the station floor is located at the center of the double?line tunnel when the tunnel excavationis completed. When the excavation of the left line tunnel is completed, the vertical convergencedeformation is smaller in the middle and larger on both sides, the construction influence of the righttunnel on the vertical convergence deformation of the left tunnel is smaller. The surface settlement causedby the undercrossing construction by the curve shield tunnel is mainly concentrated within 25m away fromthe center of the double?line tunnel. By taking necessary deformation control measures, the structuredeformation can be kept within the safe range.