城市泥水盾构隧道泥膜稳定性模拟分析
周宇1张志民2熊昊2,3,4陈凡2韩凯航2,3,4黄明峰5
Simulation Analysis on the Mud Film Stability for Urban Slurry Shield Tunnel
ZHOU Yu1ZHANG Zhimin2XIONG Hao2,3,4CHEN Fan2HAN Kaihang2,3,4HUANG Mingfeng5
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作者信息:1.厦门地铁建设有限公司,361010,厦门
2.深圳大学土木与交通工程学院,518060,深圳
3.深圳市地铁地下车站绿色高效智能建造重点实验室,518060,深圳
4.滨海韧性城市基础设施教育部重点实验室,518060,深圳
5.中交一公局厦门工程有限公司,361021,厦门
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Affiliation:1.Xiamen Metro Construction Co., Ltd., 361010, Xiamen, China
2.College of Civil and Transportation Engineering, Shenzhen University, 518060, Shenzhen, China
3.Shenzhen Key Laboratory of Green, Efficient and Intelligent Construction of Underground Metro Station, Shenzhen University, 518060, Shenzhen, China
4.Key Laboratory of Coastal Urban Resilient Infrastructures, Shenzhen University, 518060, Shenzhen, China
5.China First Highway Engineering Xiamen Engineering Co., Ltd., 361021, Xiamen, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.10.006
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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］由于厦门地铁3号线工程在隧道施工中，泥水盾构段始发端头隧道砂层与海水有贯通联系作用，盾构始发时可能发生涌水、涌泥及地面塌陷事故。故有必要研究城市泥水盾构隧道泥膜的稳定性，以确保施工安全。［方法］采用DEM-CFD(离散元-计算流体动力学)耦合法，构建了模拟不同渗透条件下泥膜成形和渗透过程的数值模型，并通过分析泥浆颗粒的空间分布、泥膜液压变化及力链网络来评估泥膜的抗渗稳定性。［结果及结论］砂粒尺寸和泥浆黏聚力的增加分别抑制和增强了泥膜的形成及其在动态水力载荷下的长期抗渗性和机械稳定性。黏聚力的增加对泥膜成形密度和抗渗稳定性都有提升作用，然而对于粒径较小地层的泥膜抗渗稳定性的提升有限。在砂质地层中，当孔隙较大且黏聚力低时，泥膜易崩坏，但增大黏聚力可有效增强稳定性。因此，通过选配合适的粒径比和泥浆黏聚力，可以提高泥膜的抗渗稳定性以满足工程需求。
Abstracts:
［Objective］ As the sand layer located at the launching end of the slurry shield section is connected with seawater during the tunnel construction of Xiamen Metro Line 3, accidents like water and mud gushing, ground collapse may occur when the shield starts. Therefore, it is necessary to study the mud film stability of urban slurry shield tunnel to ensure the construction safety. ［Method］ A numerical model is developed to simulate the mud film formation and infiltration process under different permeability conditions by using the DEM-CFD (Discrete Element Method-Computational Fluid Dynamics) coupling method. The impermeability stability of the mud film is evaluated by analyzing the spatial distribution of slurry particles, the mud film hydraulic pressure changes, and the force chain network. ［Result & Conclusion］ The increase in sand particle size and slurry cohesion inhibits and enhances mud film formation, its long-term impermeability and mechanical stability under dynamic hydraulic loads respectively. The increase in cohesion enhances both the mud film forming density and the impermeability stability. However, the enhancement of impermeability stability is limited for the mud film on smaller grain size stratum. In sandy stratum with large pores and low cohesion, the mud film is prone to collapse, but increasing the cohesive force can effectively enhance its stability. Therefore, by selecting the appropriate particle size ratio and slurry cohesion, mud film impermeability stability can be improved to meet the engineering requirements.
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