摘 要
深基坑工程在城市地下空间开发中占据重要地位，其支护结构设计与稳定性分析直接关系到工程安全和经济效益。本文针对复杂地质条件下深基坑支护结构的设计及稳定性展开研究，旨在建立一套科学合理的深基坑支护体系，确保施工过程中的安全性与经济性。基于有限元数值模拟方法，结合现场监测数据，对不同工况下的深基坑支护结构进行受力特性分析，探讨了土体参数、地下水位变化以及施工工序等因素对支护结构稳定性的影响规律。通过引入改进的极限平衡法，提出了一种考虑时空效应的深基坑支护结构稳定性评价模型，该模型能够更准确地反映实际工程情况。研究结果表明，所提出的评价模型可以有效预测深基坑支护结构在不同阶段的安全系数，为优化设计方案提供了理论依据。此外，通过对典型工程案例的应用验证，证明了该方法在指导实际工程中的可行性和优越性，不仅提高了深基坑工程施工的安全性，还降低了工程成本，具有重要的工程应用价值。本文的研究成果为复杂环境下深基坑支护结构的设计与施工提供了新的思路和技术支持，丰富了岩土工程领域的理论体系。
关键词：深基坑支护结构；稳定性分析；有限元数值模拟；极限平衡法；时空效应
Abstract
Deep foundation pit engineering plays a crucial role in urban underground space development, with the design and stability analysis of its support structures directly impacting both engineering safety and economic efficiency. This study focuses on the design and stability of deep foundation pit support structures under complex geological conditions, aiming to establish a scientifically sound and reasonable support system that ensures safety and economy during construction. Utilizing finite element numerical simulation methods combined with field monitoring data, this research analyzes the stress characteristics of deep foundation pit support structures under various working conditions, investigating the influence patterns of soil parameters, groundwater level changes, and construction procedures on the stability of support structures. By introducing an improved limit equilibrium method, a stability evaluation model for deep foundation pit support structures considering spatiotemporal effects is proposed. This model more accurately reflects actual engineering scenarios. The results indicate that the proposed evaluation model can effectively predict the safety factor of deep foundation pit support structures at different stages, providing theoretical basis for optimizing design schemes. Furthermore, the application verification through typical engineering cases demonstrates the feasibility and superiority of this method in guiding practical engineering, enhancing the safety of deep foundation pit construction while reducing costs, thus possessing significant engineering application value. The research outcomes offer new ideas and technical support for the design and construction of deep foundation pit support structures in complex environments, enriching the theoretical fr amework of geotechnical engineering.
Keywords：Deep Foundation Pit Support Structure；Stability Analysis；Finite Element Numerical Simulation；Limit Equilibrium Method；Space-Time Effect
目 录
摘 要 I
Abstract II
引 言 1
第一章 深基坑工程概况与挑战 2
1.1 深基坑工程特点 2
1.2 工程地质条件影响 2
1.3 支护结构选型原则 3
第二章 支护结构设计理论与方法 4
2.1 设计规范与标准 4
2.2 荷载计算与组合 4
2.3 稳定性验算方法 5
第三章 支护结构施工技术要点 6
3.1 施工工艺流程 6
3.2 监测与反馈分析 6
3.3 施工质量控制 7
第四章 稳定性分析与风险评估 9
4.1 变形控制标准 9
4.2 安全系数确定 9
4.3 风险预警机制 10
结 论 12
参考文献 13
致 谢 14
