中心城市地下结构群深基坑设计与周围环境安全控制是地下结构设计面临的难题,提出“深、浅”基坑临界深度划分方法,明确深基坑工程系统概念,强调环境安全控制范围,示范深基坑工程系统范围确定方法;定义深基坑整体设计法,明确土的本构关系、参数选取、科学性验证是深基坑数值模拟关键技术,提出了数值模型参数选取的综合方法和科学性验证途径,以济南示范城市参数体系构建程序;将深基坑整体设计法应用于工程案例,获知不同开挖阶段基坑(群)系统内既有结构力学性状,可对系统内既有结构变形进行主动控制,证明整体设计法能够解决复杂环境深基坑设计难题;深基坑整体设计法关注到基坑“复杂环境”和“深”的迫切需求,利用数值分析集成岩土和地下结构等不同介质的综合影响,突出主动“变形控制”原则,推动了深基坑理论和设计方法的完善和发展。
It is evident that the design of deep foundation pits for underground structure groups in central cities and the safety control of surrounding environments present new development challenges. This study proposes a method for categorizing the critical depth of "deep" and "shallow" foundation pits, clarifies the concept of deep foundation pit engineering systems, emphasizes the scope of environmental safety control, and demonstrates a method for determining the extent of deep foundation pit engineering systems. The overall design approach to deep foundation pits is defined, with constitutive relationships, parameter selection, and scientific verification of soil identified as key technologies for numerical simulation. A comprehensive method and scientific validation approach for parameter selection in numerical models are proposed based on Jinan demonstration city's parameter system. The integrated design method for deep foundation pits is applied to engineering cases to assess the mechanical properties of existing structures within the (group) system at different excavation stages and actively control their deformation, demonstrating its effectiveness in addressing complex environmental challenges. The overall design approach to deep foundation pits addresses the pressing needs related to “complex environment” and “depth”, utilizing numerical analysis to integrate various media influences such as rock, soil, and underground structures while emphasizing an active principle of “deformation control”, thereby advancing improvements in theory and design methods for deep foundation pits.
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