新建盾构隧道下穿施工对既有铁路影响分析
肖飞
Impact Analysis of New Shield Tunnel Under-passing Construction on Existing Railways
XIAO Fei
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作者信息:上海东华地方铁路开发有限公司，200071，上海
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Affiliation:Shanghai Donghua Local Railway Development Co., Ltd., 200071, 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.2024.12.032
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中图分类号/CLCN:U231.3
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栏目/Col:研究报告
摘要:
［目的］新建盾构隧道下穿既有铁路施工会引起既有铁路路基的变形，为了保证既有铁路的稳定和安全，需采取合适的加固方案。［方法］以上海机场联络线下穿李莘铁路工程为案例进行分析，该工程采用的是“门式隔离桩+地层注浆”加固方案。根据数值模拟结果和现场监测数据，分析了盾构隧道下穿施工对既有铁路的影响，并评估了“门式隔离桩+地层注浆”方案的加固效果。［结果及结论］盾构隧道下穿施工会引起既有铁路路基发生较大沉降。采用“门式隔离桩+地层注浆”加固方案可以有效控制盾构隧道下穿施工引起的既有铁路路基变形。根据数值模拟结果，加固后，既有铁路路基的最大沉降减小了67%，隧道上部的收敛变形减小了约41%，各变形均在规范规定的限值内。根据现场实测数据，盾构施工引起的既有铁路轨道和路基的累计变形均满足规范要求。受盾构顶进影响，盾构顶进侧的既有铁路路基及轨道变形波动较大。
Abstracts:
［Objective］ The construction of new shield tunnels under-passing existing railway can cause deformation of the former railway subgrade. To ensure the stability and safety of the existing railway, appropriate reinforcement measures must be adopted. ［Method］ The Shanghai Airport Connection Line under-passing Lijiatang-Shenzhuang Railway project is analyzed as a study case, which adopts a reinforcement scheme involving ′portal isolation piles+ground grouting′. Numerical simulation results and on-site monitoring data are used to assess the impact of shield tunnel under-passing construction on the existing railway, and to evaluate the effectiveness of the ′portal isolation piles+ground grouting′ reinforcement scheme. ［Result & Conclusion］ The shield tunnel under-passing construction may cause significant settlement of the existing railway subgrade, while the ′portal isolation piles+ground grouting′ reinforcement scheme effectively controls the above-mentioned railway subgrade deformation. According to numerical simulation results, the maximum settlement of existing railway subgrade decreases by 67% after reinforcement, and the convergence deformation on tunnel upper part decreases by approximately 41%. All deformations are within the limits specified by the relevant standards. On-site measurements confirm that the cumulative deformation of existing railway track and subgrade caused by the shield construction meets the regulatory requirements. However, due to the impact of shield tunneling, larger deformation fluctuations are observed in existing railway subgrade and track on one side of the shield tunneling.
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