地下装配式管廊结构复合界面性能及其设计方法

The development of the assembly culvert of underground pipe gallery can significantly improve the construction speed and the industrial level, and reduce the impact on the environment of human settlements. In the design of assembly pipe gallery, the structure performance and waterproofing of the assembly surface of precast segments and precast walls have become the key issues of the structure design. In recent years, the cracks combined with leaking in the assembled joints of the assembly Gallery have been occurred frequently. This project intends to study the contact force performance and waterproofing of the prefabricated interface, and proposes the design model and the design index of the interface waterproofing. Based on this, through the method of theory, experiment and numerical analysis, the basic structure properties of composite interface and its influence factors are studied, in which crack spacing and distribution model is proposed for non continuous structure. The calculation method of bearing capacity, deformation and crack will be established. The evaluation criterion for waterproofing performance is put forward. Through numerical analysis, the influence of parameter distribution of local settlement field and global random settlement field and prestressing connection parameters on the response of prefabricated assembly interface are is studied. The structural settlement design method and prestress layout principle based on reliability are established. The test method of waterproof performance of prefabricated interface is studied. Finally, in order to solve the shortcomings of traditional algorithm accuracy of pipe gallery internal force, combined with the stress characteristics of pipe gallery culvert, a modified counter force algorithm is put forward, and programmed calculation module is developed.

发展装配式地下管廊，可以显著提高施工速度和工业化水平、减少对人居交通环境的影响。在装配式管廊设计中，预制节段、预制墙体的拼接面结构性能和水密性能成为结构设计的关键内容。近年来，装配式管廊拼接节点裂缝漏水频发。本项目拟围绕预制拼接界面接触受力性能、水密性能开展研究，提出界面防水设计模型及其设计指标。在此基础上，通过理论、试验和数值分析的方法，研究预制拼接复合界面的基本结构性能及其影响因素，提出基于非连续结构体的裂缝间距与分布模型，建立结构的承载能力、变形和裂缝的计算方法，提出水密性能评定判据。通过数值分析，研究局部沉降场和全局随机沉降场参数分布、预应力连接参数对预制拼接界面结构响应的影响，建立基于可靠性的结构沉降设计方法和预应力布置原则。研究设计预制拼接界面防水性能试验方法。最后，为了解决管廊内力传统算法精度的不足，结合管廊箱涵受力特征，提出修正的反力算法，并开发程序化计算模块。

发展地下装配式工程结构如地下综合管廊，可以显著提高地下空间结构工程的施工速度和工业化水平、减少对人居交通环境的影响。在地下装配式工程结构与预制管廊箱涵设计中，预制节段、预制墙体的拼接面结构性能和水密性能成为结构设计的关键内容。本项目通过理论研究、数值分析、结构试验、防水性能试验等多种研究手段，开展了复合拼接面基本结构性能与失效机理、复合拼接面密水性能、不均匀沉降对预制拼接界面性能影响分析方法、密水性能简化试验方法，以及闭合框架内力的修正算法研究。研究揭示了拼接面复合胶条、连接件布置、沉降类型、预应力布置等因素对预制拼装节段复合拼接面结构性能、闭水性能的影响规律，建立了预制复合拼接面结构全过程受力变形发展机理模型。通过结构系列创新试验，构建了国内外典型密封胶条力学性能与闭水性能的耦合物理关系，构建了复合拼接界面等效刚度模型，获得了预应力布置对界面应力不均匀性的影响规律，完成了正断层和逆断层两类典型沉降类别及其参数对拼接界面转动变形的影响规律及相应理论模型构建，研究完成了闭合框架反力算法修正函数项的构建，研究开发了程序化算法和截面配筋计算模块的开发。研究成果为地下预制拼装结构的复合界面设计提供了科学参考，研究提出的预制拼接面闭水性能评价指标与试验方法，为提升地下装配式工程结构与预制管廊箱涵预制拼接面防水性能评定的科学性与实用性提供科学依据，为编制和完善相关设计和评定技术规程奠定了技术基础。