摘 要
软土地基广泛分布于我国沿海地区，其低承载力和高沉降特性对工程建设构成重大挑战，而CFG桩复合地基作为一种经济高效的地基处理技术，在实际工程中得到了广泛应用。本研究以软土地基为背景，针对CFG桩复合地基的设计与施工展开系统性探讨，旨在优化设计参数、提高施工效率并确保工程质量。研究采用理论分析、数值模拟与现场试验相结合的方法，深入研究了CFG桩的荷载传递机制、桩土应力比以及复合地基的变形特性。通过建立有限元模型，对比分析不同桩间距、桩长及褥垫层厚度对地基性能的影响，提出了适用于软土地基的CFG桩复合地基优化设计方案。同时，结合某实际工程案例，详细阐述了CFG桩施工工艺及其质量控制要点，并通过现场监测数据验证了设计方案的合理性与可靠性。研究表明，合理调整桩间距和褥垫层厚度可显著改善地基承载力与沉降性能，且施工过程中严格的质量控制是保证复合地基效果的关键因素。本研究的创新点在于提出了一种基于多参数耦合分析的优化设计方法，并通过工程实践验证了其可行性，为类似工程提供了重要的参考依据和技术支持。
关键词：软土地基；CFG桩复合地基；优化设计
ABSTRACT
Soft soil foundations are widely distributed in coastal areas of China, and their low bearing capacity and high settlement characteristics pose significant challenges to construction projects. As an economically efficient foundation treatment technology, the CFG pile composite foundation has been widely applied in practical engineering. This study systematically investigates the design and construction of CFG pile composite foundations in the context of soft soil conditions, aiming to optimize design parameters, enhance construction efficiency, and ensure engineering quality. By integrating theoretical analysis, numerical simulation, and field testing, this research thoroughly examines the load transfer mechanism of CFG piles, the stress ratio between piles and soil, as well as the deformation characteristics of the composite foundation. A finite element model was established to comparatively analyze the influence of different pile spacings, pile lengths, and cushion layer thicknesses on foundation performance, leading to the proposal of an optimized design scheme for CFG pile composite foundations suitable for soft soil conditions. Furthermore, based on a real-world engineering case, the CFG pile construction process and key quality control measures are elaborated in detail, and the rationality and reliability of the design scheme are validated through on-site monitoring data. The findings indicate that reasonably adjusting the pile spacing and cushion layer thickness can significantly improve the bearing capacity and settlement performance of the foundation, while strict quality control during construction is a critical factor in ensuring the effectiveness of the composite foundation. The innovation of this study lies in proposing an optimization design method based on multiparameter coupling analysis, which has been verified through engineering practice, providing essential reference and technical support for similar projects.
Keywords: Soft Soil Foundation; Cfg Pile Composite Foundation; Optimization Design
目 录
摘 要 I
ABSTRACT II
第1章 绪论 1
1.1 软土地基CFG桩复合地基研究背景 1
1.2 CFG桩复合地基设计与施工的研究意义 1
1.3 国内外研究现状与发展趋势 1
1.4 本文研究方法与技术路线 2
第2章 CFG桩复合地基的设计原理与方法 3
2.1 软土地基特性及其对CFG桩的影响 3
2.2 CFG桩复合地基的工作机理分析 3
2.3 CFG桩设计参数的确定方法 4
2.4 复合地基承载力计算模型构建 4
2.5 设计优化中的关键问题探讨 5
第3章 CFG桩复合地基的施工技术与工艺 6
3.1 施工前的场地勘察与准备 6
3.2 CFG桩施工工艺流程及控制要点 6
3.3 软土地基中CFG桩的质量控制措施 7
3.4 施工过程中常见问题及解决方案 7
3.5 新型施工技术的应用与展望 8
第4章 工程案例分析与效果评价 9
4.1 实际工程背景与地质条件概述 9
4.2 CFG桩复合地基设计方案实施 9
4.3 施工过程监测与数据分析 10
4.4 工程效果评价与经济效益分析 10
4.5 案例总结与经验推广 11
结论 12
参考文献 13
致 谢 14
