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Three-dimensional numerical study of long-term settlement induced in shield tunneling

机译：盾构隧道长期沉降的三维数值研究

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摘要

The objective of this study is to examine the mechanism of the long-term settlement induced in shield tunneling. A series of finite element analysis were conducted using PLAXIS 3D on a well document shield tunneling case in Taipei Mass Rapid Transit System. Various simulation were executed assessing the impact of consolidation on long-term settlement using Soft Soil and Hardening Soil with Small-strain models. Simulation to assess the impact of the creep behavior of the soil on the long-term settlement was also executed using the Soft Soil Creep model. The computed surface settlements were compared to the field measurements. It was found from this study that the computed settlement matched the field measurement when creep behavior of the soft soil was considered but if creep was not accounted for, the computed settlement undervalued the field measurements. Finally, a series of parametric study was executed to examine the influence of various parameters on the long-term settlement. The results obtained from the parametric study of shield tunneling in thick clay clearly distinguished that mechanism of long-term settlement in shield tunneling is predominantly due to creep behavior of the soft soil since consolidation constitutes 5% of the total settlement while creep accounts for 80% of the total settlement.
机译：这项研究的目的是检查盾构隧道中引起长期沉降的机理。使用PLAXIS 3D在台北捷运系统的一口井盾构隧道案例中进行了一系列有限元分析。使用小应变模型，使用软土和硬化土进行了各种模拟，以评估固结对长期沉降的影响。还使用“软土蠕变”模型执行了评估土壤蠕变行为对长期沉降影响的模拟。将计算出的表面沉降与现场测量结果进行比较。从这项研究中发现，当考虑软土的蠕变特性时，计算的沉降量与现场测量值相匹配，但是如果不考虑蠕变，则计算的沉降量会低估现场测量值。最后，进行了一系列参数研究，以检验各种参数对长期沉降的影响。从盾构隧道在厚黏土中的参数研究得出的结果清楚地表明，盾构隧道长期沉降的机理主要是由于软土的蠕变行为，因为固结占总沉降的5％，而蠕变占总沉降的5％总结算额的一半。

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