大直径盾构切穿地下连续墙对既有地铁车站变形影响的仿真分析
袁啸1李章林2何国军2张孟喜1赵慧玲1
Simulation Analysis of Large Diameter Shield Cutting through Diaphragm Wall Impact on Metro Station Deformation
YUAN Xiao1LI Zhanglin2HE Guojun2ZHANG Mengxi1ZHAO Huiling1
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作者信息:1.上海大学力学与工程科学学院，200444，上海
2.上海隧道工程有限公司，200032，上海
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Affiliation:1.School of Mechanics and Engineering Science, Shanghai University, 200444, Shanghai, China;
2.Shanghai Tunnel Engineering Co., Ltd., 200032, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.01.044
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中图分类号/CLCN:U455.43; U231.4
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栏目/Col:应用技术
摘要:
［目的］盾构隧道掘进过程中切削穿越既有地下结构会对结构产生不利影响，需要对盾构穿越引起的结构及地层变形进行研究。［方法］依托南京建宁西路过江通道的超大直径盾构隧道切穿既有地铁车站地下连续墙实际工程，建立隧道-车站-地层的三维数值模型，研究隧道切穿车站地下连续墙与桩基时地面的沉降与车站结构的变形。［结果及结论］仿真研究结果表明，车站桩基对沉降控制作用明显，盾构掘进切除桩下部后，切口上方地表产生较大沉降；切穿地下连续墙后，墙体形成以被切处为中心的沉降槽，产生不均匀沉降；盾构切穿车站地下连续墙引起运营地铁线两股钢轨的差异沉降，但在安全控制指标范围内。该仿真预测性分析结果可为该工程后期施工与监测，也为同类盾构隧道切穿既有地下工程的施工优化提供参考。
Abstracts:
［Objective］ Cutting through the existing underground structure in the process of shield tunneling will cause adverse effects on the structure. Therefore, it is necessary to study the consequent deformation of the structure and the stratum caused by shield tunneling. ［Method］ Based on the actual project of the super-large diameter shield tunnel of Nanjing Jianning West Road river-crossing passage that cuts through the diaphragm wall of the existing metro station, a three-dimensional numerical model of tunnel-station-stratum is established, to study the ground settlement and the deformation of the station structure when the tunnel cuts through the diaphragm wall and pile foundation of the station. ［Result & Conclusion］ The simulation research results show that the station pile foundation has a significant effect on settlement control. After the shield tunneling cuts off the lower part of the pile, a large settlement occurs on the ground surface above the incision. After the diaphragm wall being cut through, a settlement trough forms centered on the cut place of the wall, resulting in uneven settlement. The shield cutting through the underground diaphragm wall of the station causes differential settlement of two rails on the operating metro line, but still within the range of safety control index. The predictive results of this simulation analysis can provide a reference for the following construction and monitoring of this project, as well as for the construction optimization of similar shield tunnels cutting through existing underground engineering.
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