水平及岸坡地层中大直径盾构隧道邻近穿越对码头栈桥影响  

Influence of Large-Diameter Shield Tunnel Adjacent Crossing on Wharf Trestle in Horizontal and Bank Slope Strata

作　　者：罗基伟 王乐明 杨立功 王欢 李建东 左殿军[1] LUO Jiwei;WANG Leming;YANG Ligong;WANG Huan;LI Jiandong;ZUO Dianjun(Geotechnical Engineering Research Center,Tianjin Research Institute for Water Transport Engineering,Ministry of Transport,Tianjin 300456,China;Civil Engineering Design and Research Institute,China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]交通运输部天津水运工程科学研究院岩土工程研究中心,天津300456 [2]中国铁路设计集团有限公司土建工程设计研究院,天津300308

出　　处：《中国铁道科学》2025年第1期120-135,共16页China Railway Science

基　　金：国家自然科学基金资助项目(52308401);国家重点研发计划项目(2021YFB2600900);中央级公益性科研院所基本科研业务费资助项目(TKS20220105);天津市交通运输科技发展计划项目(2022-43)。

摘　　要：针对穿江越海工程中大直径盾构隧道可能对邻近水工结构带来较大风险的问题,以武汉地铁11号线越江隧道为背景,研究大直径盾构隧道在水平及岸坡地层中邻近穿越对栈桥的影响。先采用离心模型试验,分析盾构地层损失率从0.5%增至2.0%过程中的栈桥沉降及桩基弯矩分布;然后基于离心模型试验结果标定参数,开展原型隧道-地层-栈桥的数值模拟,进一步研究盾构地层损失、开挖面压力和开挖间距等因素对栈桥的影响。结果表明:地层和栈桥的沉降均随地层损失率增大而显著增长,岸坡段地层变形大于水平段的,但其沉降槽宽度较小,控制地层损失是减小栈桥沉降的有效方法;开挖面的支护压力对其稳定性及前后地层变形影响显著,控制开挖面压力与静止土压力比值在0.8~1.2时,开挖面稳定性良好,盾构从陆域水平段进入岸坡段时,应精细化控制并采用略小的开挖面压力;桥隧间距对栈桥变形及桩基弯矩具有控制性作用,桥隧间距超过10倍洞径时,盾构穿越带来的沉降差异可忽略。Regarding the problem of huge risks might caused by large-diameter shield tunnels to adjacent hydraulic structures in river-crossing and sea-crossing projects,taking the the Yangtze River-Crossing Tunnel of Wuhan Metro Line 11 as the background,the influence of large-diameter shield tunnel adjacent crossing on trestle in horizontal and bank slope strata was studied.Firstly,centrifugal model tests were adopted to analyze the trestle settlement and pile bending moment distribution during the increase of shield stratum loss rate from 0.5%to 2.0%.Numerical simulations of the prototype tunnel-strata-trestle were then carried out based on parameters calibrated from the centrifugal model test results,and the effects of shield stratum loss,excavation face pressure and excavation spacing on the trestle were further investigated.The results show that the settlement of the strata and the trestle both increase significantly with the rise of stratum loss rate.The stratum deformation of the bank slope section is greater than that of the horizontal section,but the width of its settlement trough is smaller.Controlling stratum loss is an effective method to reduce settlement of the trestle.The supporting pressure of the excavation face has a significant impact on its stability and the deformation of the surrounding strata.The excavation face shows good stability when the ratio of the excavation face pressure to the static soil pressure is controlled within 0.8-1.2.When the shield enters the bank slope strata from the horizontal section,it should be finely controlled and slightly smaller excavation face pressure should be used.The spacing between the trestle and tunnel controls the deformation of the trestle and the bending moment of the pile.The settlement difference of trestle caused by shield crossing can be negligible when the spacing between trestle and tunnel exceeds 10 times of the tunnel diameter D0.

关 键 词：盾构隧道 桩基栈桥 邻近穿越 地层损失 开挖面压力 离心模型试验 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]