基坑支护结构的稳定性分析与安全控制技术 -土木工程专业

摘要

随着城市地下空间开发的不断推进，基坑工程日益向深、大、复杂方向发展，支护结构的稳定性问题成为保障施工安全与周边环境稳定的关键。本文旨在系统研究基坑支护结构的稳定性影响因素及其破坏机理，提出科学有效的安全控制技术，以提升基坑工程的整体安全性与可靠性。研究综合运用数值模拟、现场监测与理论分析等手段，构建了多因素耦合作用下的支护结构稳定性分析模型，并对典型工程案例进行了验证分析。结果表明，支护刚度、土体参数及施工工况对结构变形与内力分布具有显著影响，尤其在软弱地层和超深基坑中表现更为突出。基于研究成果，提出了动态反馈设计方法与分级预警控制体系，实现了对支护结构变形的有效控制与风险预判。本研究的创新点在于建立了考虑施工时序与地质条件不确定性的稳定性评价模型，并提出了适应复杂环境条件的安全控制策略，为基坑工程的设计优化与施工安全管理提供了理论支撑和技术指导。

关键词：基坑支护结构稳定性；多因素耦合分析；动态反馈设计；分级预警控制；施工时序与地质不确定性

ABSTRACT

With the continuous development of urban underground space, foundation pit engineering has increasingly evolved toward greater depth, larger scale, and higher complexity. The stability of supporting structures has thus become a critical factor in ensuring both construction safety and the stability of the surrounding environment. This study systematically investigates the influencing factors and failure mechanisms related to the stability of foundation pit support structures, aiming to propose scientifically effective safety control techniques that enhance the overall safety and reliability of foundation pit engineering. By integrating numerical simulation, field monitoring, and theoretical analysis, a stability analysis model for support structures under multi-factor coupling effects is established and validated through case studies of typical engineering projects. Results indicate that support stiffness, soil parameters, and construction conditions significantly influence structural deformation and internal force distribution, with these effects being particularly pronounced in weak strata and ultra-deep foundation pits. Based on the research findings, a dynamic feedback design method and a tiered early-warning control system are proposed, enabling effective control of support structure deformation and risk prediction. The innovation of this study lies in the establishment of a stability evaluation model that accounts for construction sequencing and geological uncertainty, as well as the proposal of safety control strategies tailored to complex environmental conditions, thereby providing theoretical support and technical guidance for the optimization of foundation pit engineering design and construction safety management.

Keywords: Foundation Pit Support Structure Stability; Multi-factor Coupling Analysis; Dynamic Feedback Design; Graded Early Warning Control; Construction Sequence and Geological Uncertainty

摘要 I

ABSTRACT II

第1章绪论 1

1.1 研究《基坑支护结构的稳定性分析与安全控制技术研究》的背景和意义 1

1.2 《基坑支护结构的稳定性分析与安全控制技术研究》领域的研究现状 1

1.3 本文研究《基坑支护结构的稳定性分析与安全控制技术研究》的方法 2

第2章基坑支护结构体系的受力特性分析 3

2.1 支护结构类型及其适用性对比 3

2.2 土压力分布模型的建立与验证 3

2.3 支护结构内力与变形计算方法 4

2.4 多因素耦合作用下的结构响应分析 4

第3章基坑支护结构稳定性的关键影响因素识别 6