深基坑简化计算和有限元计算对比分析

发布时间：2018-06-12 07:03

本文选题：简化计算 + 有限元计算　；参考：《华南理工大学》2013年硕士论文

【摘要】：简化计算方法作为目前深基坑支护结构设计通用的计算方法，本身在基本理论假设方面存在不足之处，在计算结果上与实际有所差异，，而有限元作为通用性较强发展起来的比较完善的分析方法，在深基坑支护结构内力和变形方面有着强大的分析功能和优势。因此，本文结合两种计算方法各自的优势进行计算和对比分析，找出两类算法在支护结构内力和变形上的差异，并分析影响差异的主要因素，最终实现对两类计算方法的合理应用，指导深基坑支护结构设计。本文的行文思路是：首先回顾简化计算和有限元计算相关理论的研究现状；其次选择目前通用的简化计算软件和专业有限元分析软件，分别对其基本理论假设进行了阐述；然后建立简单算例，通过对比简化计算和有限元计算在计算悬臂桩内力和变形上的差异，找出影响差异的关键因素；最后在实际工程中，通过分析两类算法计算结果上的差异和调整关键影响因素，实现两类算法的合理利用。本文主要完成的工作有：（1）简要的概括了简化计算方法中有关土压力、嵌固深度以及支护结构内力和变形计算方法的研究现状；介绍了有限元方法国内外研究发展现状以及有限元方法在岩土工程中的应用。（2）介绍了简化计算方法中的土抗力法的基本理论，包括土压力计算理论、嵌固深度计算理论、内力和变形计算理论；介绍了有限元计算的基本理论，包括岩土体的本构关系及弹塑性分析、支护结构的模拟。（3）选取广州地区具有代表性的岩土体，通过对简单算例的计算和对比分析，发现简化计算和有限元计算的差异并找出影响差异的关键因素。（4）在实际工程条件下，对比简化计算和有限计算结果，找出差异，通过调整关键影响因素，实现两类计算方法的合理应用。
[Abstract]:The simplified calculation method is used as a general calculation method for the current deep foundation pit support structure design , and has some shortcomings in the basic theory assumption , and the finite element is used as a comparatively perfect analysis method for the strong development of the deep foundation pit , and the finite element is used as a comparatively perfect analysis method for the strong development of the deep foundation pit , so as to find out the difference between the two types of algorithms in the internal force and deformation of the support structure , and analyze the main factors influencing the difference , and finally realize the reasonable application of the two types of calculation methods and guide the structural design of the deep foundation pit .

In this paper , the author firstly reviews the current research situation of simplified calculation and finite element calculation .
Secondly , the general simplified calculation software and the professional finite element analysis software are selected , and their basic theoretical assumptions are expounded .
Then a simple example is established to find out the key factors which influence the difference by comparing the simplified calculation with the finite element method to calculate the difference of the internal force and deformation of the cantilever pile .
Finally , in the practical engineering , the reasonable utilization of two kinds of algorithms is realized by analyzing the difference between the two kinds of algorithms and adjusting the key influencing factors .

The main tasks in this paper are as follows :

( 1 ) The research status of the calculation methods of soil pressure , embedded depth and internal force and deformation of support structure are summarized .
This paper introduces the research and development of finite element method at home and abroad , and the application of finite element method in geotechnical engineering .

( 2 ) The basic theory of soil resistance method in simplified calculation method is introduced , including soil pressure calculation theory , embedded depth calculation theory , internal force and deformation calculation theory ;
The basic theory of finite element calculation is introduced , including constitutive relation and elastic - plastic analysis and simulation of support structure .

( 3 ) Select a representative geotechnical body in Guangzhou area , and find out the difference of simplified calculation and finite element calculation and find out the key factors that influence the difference .

( 4 ) To find out the difference between the simplified calculation and the limited calculation results under the actual engineering conditions , and realize the reasonable application of two kinds of calculation methods by adjusting the key influencing factors .
【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】：TU473.2

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