深基坑支护方案及支护桩优化研究

发布时间：2018-06-17 18:20

本文选题：深基坑 + 土压力　；参考：《辽宁工程技术大学》2013年硕士论文

【摘要】：随着城市的迅速发展及城镇化进程的不断推进，深基坑工程日益增多，基坑周围建筑物更为密集，地下设施错综复杂，影响深基坑支护的不确定因素复杂多样。而且深基坑施工和支护往往以经验和工程类比法为主，尤其对支护方案的优选和支护构件的优化研究的并不深入系统。因此本文采用模糊数学理论对深基坑支护方案进行优选，并运用有限元拓扑方法对支护桩进行优化。本文首先给出了基坑支护结构与土体相互作用关系、土压力的计算以及深基坑支护型式和分析模型，同时详述了每种支护型式的技术参数及适用范围。并确立了深基坑支护方案初选、终选和结构校核以及对支护桩的有限元拓扑优化四个程序。其次，结合模糊数学理论建立了深基坑方案优化模糊评价方法，同时对支护桩进行选型及强度校核，在此基础上，给出了支护桩有限元拓扑优化原理及方法。最后，，结合沈阳南华广场深基坑支护工程，对其支护方案运用模糊数学理论，比较分析了桩锚式和内撑式两种支护方案，确立了适合工程条件的桩锚式支护方案进行设计，并用等值梁法进行了稳定性验算。最后对支护桩运用拓扑方法进行了优化分析，得出了在不同优化目标下支护桩合理的拓扑结构，且优化后构件在满足强度的同时提高了材料的利用率。
[Abstract]:With the rapid development of the city and the development of urbanization, the construction of deep foundation pit is increasing day by day, the buildings around the foundation pit are more dense, the underground facilities are complicated, and the uncertain factors affecting the support of deep foundation pit are complex and diverse. And deep foundation pit construction and support are often based on experience and engineering analogy, especially for the optimal selection of support schemes and support components optimization research is not in-depth and systematic. In this paper, the theory of fuzzy mathematics is used to optimize the support scheme of deep foundation pit, and the topology method of finite element is used to optimize the supporting pile. In this paper, the interaction between foundation pit support structure and soil mass, the calculation of earth pressure, and the support type and analysis model of deep foundation pit are given, and the technical parameters and applicable range of each support type are described in detail. Four programs, including primary selection, final selection and structural checking, and topology optimization of finite element method for supporting piles are established. Secondly, combined with fuzzy mathematics theory, the fuzzy evaluation method of deep foundation pit scheme optimization is established. At the same time, the type selection and strength check of supporting pile are carried out. On this basis, the principle and method of finite element topology optimization of supporting pile are given. Finally, combined with the deep foundation pit support project of South China Square in Shenyang, this paper compares and analyzes two kinds of support schemes, pile anchor type and inner support type, and establishes the design of pile anchor support scheme suitable for engineering conditions by using the theory of fuzzy mathematics. The stability is checked by the equivalent beam method. Finally, the topology method is used to optimize the supporting pile, and the reasonable topology structure of the supporting pile is obtained under different optimization objectives, and the optimized component not only satisfies the strength but also improves the utilization ratio of the material.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU753

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