地铁深基坑硬化土模型参数敏感性研究
赫德亮1李红普2何本国2
Sensitivity Study of Hardened Soil Constitutive Model Parameters for Metro Deep Foundation Pit
HE DeliangLI HongpuHE Benguo
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作者信息:1.中铁十四局集团第四工程有限公司， 250002， 济南
2.东北大学深部金属矿山安全开采教育部重点实验室， 110819， 沈阳
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Affiliation:China Railway 14th Bureau Group 4th Engineering Co., Ltd., 250002, Ji’nan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.12.016
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中图分类号/CLCN:TU44
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栏目/Col:研究报告
摘要:
目的：基坑工程数值计算中参数取不准一直是困扰工程界和学术界的关键技术问题。基坑工程土体参数敏感性研究可为数值模拟分析参数取值提供重要依据。方法：依托济南地铁黄河隧道南岸工作井基坑工程，利用有限差分数值的FLAC3D软件，建立工作井基坑三维数值计算网格，结合现场工程设计和施工方案逐层开挖计算，分析了基坑开挖地下连续墙深层水平位移、地面沉降和支撑轴力的HS (硬化土)模型参数效应。将水平位移、地面沉降和支撑轴力计算结果与实测值进行了对比。结果及结论：基坑开挖后对地下连续墙深层水平位移和地面沉降敏感程度大的主要影响参数从大到小依次为：内摩擦角φ，固结系数Knc，弹性模量指数Em，卸载刚度Eur,50。支撑轴力敏感程度大的主要影响参数从大到小依次为：固结系数Knc,割线刚度Eref,50,弹性模量指数Em,卸载刚度Eur,50,内摩擦角φ。并以此为基础，反演济南地铁黄河隧道南岸工作井基坑工程关键参数，最终反演预测结果与实际监测结果基本一致。研究成果以期为HS模型在基坑数值模拟分析中的应用提供借鉴和参考。
Abstracts:
Objective: In numerical calculations for foundation pit engineering, inaccurate parameter selection is a critical technical issue troubling both the engineering and academic communities. Investigating the sensitivity of soil parameters in foundation pit engineering provides essential reference for determining numerical simulation analysis parameter values.Method: Leveraging the foundation pit engineering of Yellow River tunnel south bank working shaft of Ji’nan Metro, a threedimensional numerical calculation grid for working shaft foundation pit is established using finite difference numerical analysis software FLAC3D. Considering the onsite engineering design and construction scheme, layerbylayer excavation calculation is simulated to analyze the effects of HS (hardened soil) model parameters including deepseated horizontal displacement of the underground diaphragm wall, land subsidence, and supporting axial forces. The calculated results of the above are compared with measured values.Result & Conclusion: The major influential parameters on the sensitivity of deepseated horizontal displacement and land subsidence after foundation pit excavation are: internal friction angle φ, consolidation coefficient Knc, elastic modulus index Em, unloading stiffness Eur,50. For the sensitivity of supporting axial forces, the key influencing parameters are: consolidation coefficient Knc, secant stiffness Eref,50, elastic modulus index Em, unloading stiffness Eur,50, and internal friction angle φ. Based on this, critical parameters for Ji’nan Metro Yellow River tunnel south bank working shaft foundation pit engineering are inversely obtained, and the predicted results align closely with the fieldmonitored results. The research findings aim to provide guidance and reference for the application of HS model in numerical analysis of foundation pit engineering.
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