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Evaluation of ground movements due to pipe-jacking process of large rectangular structures in soft clays
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-15 , DOI: 10.1016/j.tust.2025.106380
Zhongjie Zhang, Ting Deng, Zhenhao Shi, Maosong Huang, Haoran Wang, Xiaoqiang Gu
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-15 , DOI: 10.1016/j.tust.2025.106380
Zhongjie Zhang, Ting Deng, Zhenhao Shi, Maosong Huang, Haoran Wang, Xiaoqiang Gu
Pipe jacking method has been increasingly employed in congested urban areas to construct large-scale underground structures (e.g., subway stations), given its advantages in minimizing interventions on adjacent infrastructures. Nevertheless, it remains challenging to assess the associated ground movements. In this work, we form a numerical model for evaluating the ground movements caused by large rectangular structures in soft clays. The salient features of the model rest on explicitly accounting for (1) continuous frictional sliding at pipe–soil interface and (2) small-strain stiffness of soils. The former is achieved by combining displacement-controlled approach (DCA) and finite sliding contact method, while the latter is included by using inter-granular strain (IGS) based constitutive model proposed by the authors. The built numerical model is applied to a case study of the construction of a subway station in Shanghai, where the model performance is assessed against actual field measurements. We utilize the numerical model to analyze the characteristics of ground movements and the roles played by pipe–soil interface friction and small-strain behavior of soils. Our analyses suggest that, compared with conventional construction methods, pipe–soil interface friction and convergence deformation of structure can be important factors for controlling ground movements associated with pipe-jacking.
中文翻译:
评估软粘土中大型矩形结构的顶管过程引起的地面运动
顶管方法越来越多地在拥挤的城市地区用于建造大型地下结构(例如地铁站),因为它在最大限度地减少对相邻基础设施的干预方面具有优势。然而,评估相关的地面运动仍然具有挑战性。在这项工作中,我们建立了一个数值模型,用于评估软粘土中大型矩形结构引起的地面运动。该模型的显著特点在于明确考虑了 (1) 管道-土壤界面处的连续摩擦滑动和 (2) 土壤的小应变刚度。前者是通过结合位移控制方法 (DCA) 和有限滑动接触法实现的,而后者是通过使用作者提出的基于晶间应变 (IGS) 的本构模型来实现的。构建的数值模型应用于上海地铁站建设的案例研究,其中模型性能根据实际现场测量进行评估。我们利用数值模型来分析地面运动的特征以及管-土界面摩擦和土体的小应变行为所起的作用。我们的分析表明,与传统施工方法相比,管-土界面摩擦和结构的收敛变形是控制顶管相关地表移动的重要因素。
更新日期:2025-01-15
中文翻译:
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评估软粘土中大型矩形结构的顶管过程引起的地面运动
顶管方法越来越多地在拥挤的城市地区用于建造大型地下结构(例如地铁站),因为它在最大限度地减少对相邻基础设施的干预方面具有优势。然而,评估相关的地面运动仍然具有挑战性。在这项工作中,我们建立了一个数值模型,用于评估软粘土中大型矩形结构引起的地面运动。该模型的显著特点在于明确考虑了 (1) 管道-土壤界面处的连续摩擦滑动和 (2) 土壤的小应变刚度。前者是通过结合位移控制方法 (DCA) 和有限滑动接触法实现的,而后者是通过使用作者提出的基于晶间应变 (IGS) 的本构模型来实现的。构建的数值模型应用于上海地铁站建设的案例研究,其中模型性能根据实际现场测量进行评估。我们利用数值模型来分析地面运动的特征以及管-土界面摩擦和土体的小应变行为所起的作用。我们的分析表明,与传统施工方法相比,管-土界面摩擦和结构的收敛变形是控制顶管相关地表移动的重要因素。