内支撑支护基坑开挖有限元模拟研究

发布时间：2018-03-20 02:13

本文选题：内支撑支护　切入点：计算原理　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：基坑工程是目前岩土工程领域的难点和热点问题之一，国内外专家学者已做了大量的分析研究工作，取得了一些有重要意义的成果。本文以实际工程项目为依托，通过对支护结构计算理论和有限元理论的归纳总结，得出了基坑开挖问题的一般性理论和计算方法。并采用MIDAS/GTS有限元软件对基坑的分步开挖过程进行了数值仿真分析，，对基坑开挖过程中基坑及支护结构的变形与内力进行了分析研究。本文的主要研究工作如下： 1对排桩支护的计算理论进行了较为全面、系统的分析和研究。对土压力的计算理论，支护结构的计算方法及支护结构的破坏及变形机理进行了归纳总结。 2．以内蒙古赤峰市南二环项目金家寨地道桥工程为依托，利用有限元软件midas/gts建立了模拟基坑开挖过程的有限元分析模型，对基坑受力过程进行仿真分析，模型中考虑了排桩、支撑和土体三者间的共同作用。将计算结果通规范规定进行了比较分析，确定了合理的排桩支护结构参数。 3．根据数值软件的计算结果，研究土体本构及支护结构中的几个重要参数对计算结果的影响规律，为深基坑支护设计中合理选取模型参数提供必要的参考依据。 4．根据以上理论的阐述和实际工程的计算，最后提出一些相应的结论和建议，为实际工程中的基坑计算的推广应用和安全结构设计提供理论基础和计算依据。
[Abstract]:Foundation pit engineering is one of the difficult and hot issues in the field of geotechnical engineering at present, domestic and foreign experts and scholars have done a lot of research, and obtained some important results. Based on the actual engineering project, through theoretical calculation and finite element theory of retaining structure are summarized, the problems of foundation pit the excavation of the general theory and method of calculation. And using MIDAS/GTS finite element software for foundation pit excavation process was analyzed by numerical simulation. In the process of excavation and supporting structure deformation and internal force of foundation pit excavation are analyzed.
The main research work of this paper is as follows:
1, a comprehensive and systematic analysis and research is carried out for the calculation theory of row pile support. The calculation theory of earth pressure, the calculation method of support structure and the failure and deformation mechanism of supporting structure are summarized.
2. in Inner Mongolia Chifeng City, South Second Ring Road Project Jinjiazhai tunnel bridge project, established the finite element analysis model for the simulation of excavation process by using finite element software midas/gts, the stress of excavation process simulation model considering the pile senior high school entrance examination, the interaction of soil and support among the three. The calculation results through specification the provisions of the comparative analysis, to determine the parameters of row pile retaining structure reasonable.
3., according to the calculation results of numerical software, the influence rules of several important parameters in soil constitutive and supporting structures on the calculation results are studied, which provides a necessary reference for reasonable selection of model parameters in deep foundation pit support design.
4., according to the above theory and the calculation of actual project, finally, it puts forward some corresponding conclusions and suggestions, which will provide theoretical basis and calculation basis for the popularization and application of foundation pit calculation and the design of safety structure in practical engineering.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753

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