浅埋砂土地层盾构带压进舱施工作业开挖面稳定性研究
葛俊
Stability Study of Shield Tunnel Excavation Face Induced by Shield Chamber Pressure Entering in Shallow-Buried Sand Stratum
GE Jun
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作者信息:杭州市地铁集团有限责任公司，310003，杭州
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Affiliation:Hangzhou Metro Group Co., Ltd., 310003, Hangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.01.016
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
［目的］解决浅埋砂土地层盾构带压进舱施工作业过程中开挖面稳定性问题。［方法］综合采用数值模拟、理论解析和工程验证的方法对盾构带压进舱施工作业过程中的极限支护压力进行研究。首先，采用数值模拟方法对浅埋砂土地层主动破坏现象进行研究，得到了相应的极限支护压力和破坏区形状；然后，基于数值模拟结果，构建了适用于浅埋砂土地层的破坏模式，并求解了相应的极限支护压力；最后，将本模型应用于杭州地铁5号线工程的盾构带压进舱施工作业，并对地面沉降情况进行了监测。［结果及结论］极限支护压力随着埋深的增大近似线性增大，随着内摩擦角的增大近似指数形式减小；失稳模式浅埋砂土地层呈现下部楔形体和上部倒圆台的形状，其中上部破坏区进一步分为破坏核心区和扰动区；通过与数值模型、文献模型对比发现，所提出的楔形体+倒圆台组合破坏模式能较好地描述因浅埋砂土地层无法成拱而导致破坏区可达地面的现象；杭州地铁5号线工程盾构带压进舱施工作业过程中，引起地面最大沉降值为9.5mm，影响范围为隧道轴线两侧10m范围内。
Abstracts:
［Objective］ Solve the problem of excavation surface stability during shield tunneling with pressure entry in shallow-buried sandy stratum. To solve the problem of the stability of tunnel face of shield tunnel with pressure into the chamber in shallow buried sandy soil stratum. ［Method］ The limit support pressure during the shield tunneling pressurized chamber entry operation is studied by combining numerical simulation, theoretical analysis and engineering verification methods. Firstly, the active failure phenomenon of shallow-buried sandy soil stratum is studied by numerical simulation, and the corresponding limit support pressure and failure zone shape are obtained. Then, based on the numerical simulation results, the failure mode applicable to shallow-buried sandy soil stratum is constructed, and the corresponding ultimate support pressure is solved. Finally, the model is applied in the Hangzhou Metro Line 5 pressurized inlet project, and the ground settlement is monitored. ［Result & Conclusion］ The limit support pressure increases approximately linearly with the increase of burial depth, and decreases approximately exponentially with the increase of internal friction angle; the instability mode of the shallow-buried stratum presents the shape of lower wedge and upper inverted cone/platform, in which the upper failure zone is further split into the damage core zone and disturbance zone. By comparing with the numerical model and the literature model, it is found that the proposed wedge + inverted cone/platform model can better describe the phenomenon that the damage zone can reach the ground surface due to the inability of the shallow-buried sandy stratum to form an arch; during the shield pressure entry construction of Hangzhou Metro Line 5 project, the maximum ground settlement value caused is 9.5 mm, and the influence range is within 10 m on both sides of the tunnel axis.
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