基于HS-Small模型的黄浦江既有防汛墙加固改造受力分析研究

Analysis and Research on Stress of Reinforcement and Reconstruction of Existing Flood Control Wall along Huangpu River Based on HS-Small Model

摘要:

在城市更新背景下，为了提高区域防洪除涝能力，对城市河道既有防汛墙进行加固改造成为城市发展过程中需要解决的新问题。在防汛墙改造设计过程中，需要对新建桩基泥面线处位移进行复核以保证防汛墙的安全性与稳定性。以黄浦江中上游堤防防洪能力提升工程为例，围绕黄浦江既有防汛墙加固改造过程中新老桩基联合受力问题，为更准确地分析新老桩基共同工作时的受力与变形特性，通过引入HS-Small模型对新建桩基泥面线处位移进行分析，并考虑土体受桩基挤压后的硬化效应与既有桩基在改造前的初始变形状态，合理设计建模流程，使计算更贴合实际工况。结果表明，与传统公式法相比，该方法能更真实地反映桩土相互作用及桩基位移变化，为既有防汛墙加固改造工程中的桩基设计提供了更为可靠的计算手段，为类似工程提供理论依据与实践参考。

Abstract:

Under the background of urban renewal, in order to improve the ability of regional flood and waterlogging control, the reinforcement and reconstruction of the existing flood control wall of urban river have become a new problem to be solved in the process of urban development. During the design of flood control wall reconstruction, it is necessary to recheck the displacement at the mud line of the new pile foundation to ensure the safety and stability of the flood control wall. Taking the flood control capacity improvement project of the dikes at the middle and upper reaches of the Huangpu River as an example, focusing on the joint force of new and old pile foundations during the reinforcement and reconstruction of the existing flood control wall along the Huangpu River, in order to more accurately analyze the force and deformation characteristics of the new and old pile foundations during jointed work, the HS-Small model is introduced to analyze the displacement at the mud line of the new pile foundation, and the hardening effect of the soil after being squeezed by the pile foundation and the initial deformation state of the existing pile foundation before the reconstruction are considered. The reasonable design of modeling process can make the calculation more suitable for the actual working conditions. The results show that compared with the traditional formula methods, this method can more truly reflect the pile-soil interaction and pile foundation displacement changes, which provides a more reliable calculation method for the design of pile foundation in the reinforcement and reconstruction projects of the existing flood control walls, and provides a theoretical basis and practical reference for similar projects.