软土中双排桩支护结构体系受力分析与计算研究

发布时间：2018-05-16 10:47

本文选题：双排桩 + 计算模型　；参考：《华南理工大学》2013年硕士论文

【摘要】：双排桩是近二十年[1]来运用越来越普遍的一种支挡结构，在软土深基坑支护、临时围堰、公路边坡防护等领域被广泛应用和推广。一直以来国内外学者对悬臂式双排桩支护结构进行了大量的研究和探讨，总结了较多对实际工程有很好指导意义的规律和经验。但关于双排桩的理论研究还有待深入，对其结构设计的计算也尚未达成一致。本文主要研究内容如下： 1.总结目前双排桩支护结构的国内外研究成果和工程运用，提出该领域尚待研究的问题，得出对双排桩支护结构的优化设计有参考价值的建议。 2．概括了悬臂式双排桩的类型及论文涉及的有限元理论，对大型通用有限元软件MIDAS-GTS进行初步介绍，简述双排桩支护结构体系的分析方法。 3.将三维应变有限元应用于深层软土基坑中悬臂式双排桩支护结构的研究，采用MIDAS-GTS建立三维有限元模型。分析总结嵌固深度与坑深比、坑内加固土体范围、桩间土加固对双排桩变形和内力的影响；研究分析桩顶与盖板连接处的受力及盖板开裂情况，提出具有工程实践意义的建议或结论。 4.通过对工程实例的计算结果与监测数据的对比分析，验证了本文所得结论和所提方法的合理性。从而为悬臂式双排桩支护结构的应用和推广做了有益的参考。
[Abstract]:Double-row pile is a kind of retaining structure which is more and more popular in recent twenty years. It is widely used and popularized in soft soil deep foundation pit support, temporary cofferdam, highway slope protection and so on. Scholars at home and abroad have done a lot of research and discussion on the cantilever double-row pile supporting structure, and summarized many rules and experiences which have good guiding significance for practical engineering. However, the theoretical study of double row piles needs to be further studied, and the calculation of their structural design has not been agreed. The main contents of this paper are as follows: 1. This paper summarizes the domestic and international research results and engineering application of double-row pile supporting structure, puts forward the problems to be studied in this field, and draws some valuable suggestions for the optimization design of double-row pile supporting structure. 2. This paper summarizes the types of cantilever double-row piles and the finite element theory involved in this paper, introduces the large and universal finite element software MIDAS-GTS, and briefly describes the analysis method of double-row piles supporting structure system. 3. Three-dimensional strain finite element method is applied to the research of cantilever double-row pile supporting structure in deep soft soil foundation pit. The three-dimensional finite element model is established by MIDAS-GTS. This paper analyzes and sums up the influence of the ratio of embedded depth to pit depth, the range of soil reinforcement in the pit, the effect of soil reinforcement between piles on the deformation and internal force of double-row piles, and studies and analyzes the stress on the joint of pile top and cover plate and the cracking of cover plate. Some suggestions or conclusions of engineering practice are put forward. 4. Through the comparison and analysis of the calculation results and the monitoring data of the engineering examples, the rationality of the conclusions and the proposed methods are verified. Thus, it makes a useful reference for the application and popularization of cantilever double row pile supporting structure.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU473.1

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