基于南水北调中线配套工程沉井结构有限元分析

发布时间：2018-05-13 05:00

本文选题：沉井结构 + ANSYS　；参考：《华北水利水电大学》2017年硕士论文

【摘要】：沉井是可以用来修筑地下工程以及修建深基础兼作护壁的一种构筑物形式,与其他类型的施工工艺或方法相对比,可以发现沉井施工具有如下几个优点:施工过程可靠、土体挖掘量少、降低资金投入、施工工期很短等。总的来说,加强对沉井的施工工艺研究,准确模拟沉井结构的应力以及位移的变化过程并对所得出的云图结果加以分析,这无疑具有很重要的的现实意义。本文选题来源为《河南省郑州工程23号分水口门输水线路北环渠西路段设计变更报告》,本文以南水北调中线郑州段的配套工程中的某一工程实例沉井为研究目标,对沉井进行了系统的探究。首先,文章结合大量参考文献较为完整的阐述了沉井的基本构造、设计方法以及施工过程和施工注意事项,然后对工程实例沉井结构进行可行性规范计算,即用传统土压力理论,计算得出沉井关于结构抗浮稳定、抗滑稳定等各项条件,并与相关设计规范要求进行对比;然后,针对该沉井结构使用有限元软件ANSYS,构建沉井结构三维有限元模型,对其在工程中实际发生的变化进行整体受力分析及不同条件下的阶段性受力分析,对该模型井壁和底板施加初始应力之后得出其应力及位移变化云图;最后,根据云图数值把沉井应力及位移变化的结果与设计要求进行对比,得出沉井结构满足设计要求的结论,补充了传统沉井研究的不足之处。考虑到沉井结构在施工期和运行期两种工况下产生的应力不同,因此有必要针对沉井结构在两种工况下分别进行有限元模拟,分析其应力及位移变化情况,并通过两种工况应力及位移数值前后比较得出规律。
[Abstract]:Caisson is a kind of structure which can be used to build underground engineering and deep foundation as wall protection. Compared with other construction techniques or methods, it can be found that caisson construction has the following advantages: the construction process is reliable, The amount of soil excavation is less, the investment of funds is reduced, the construction period is very short and so on. In general, it is of great practical significance to strengthen the research on the construction technology of the caisson, to accurately simulate the variation process of the stress and displacement of the caisson structure and to analyze the result of the cloud map obtained. This paper is based on the "report on the Design change of the West Section of the North Ring Canal of No. 23 Water diversion Line of Zhengzhou Project, Zhengzhou, Henan Province". This paper takes a project example in Zhengzhou section of South-to-North Water transfer Project as the research goal. A systematic exploration of the caisson is carried out. First of all, combined with a large number of references, the paper expatiates on the basic structure, design method, construction process and construction precautions of the caisson, and then calculates the feasibility of the caisson structure in practical engineering. That is, by using the traditional earth pressure theory, the conditions of structure anti-floating stability and anti-slide stability of the caisson are calculated and compared with the requirements of the relevant design code. Aiming at the caisson structure, the finite element software ANSYSis is used to construct the three-dimensional finite element model of the caisson structure. The integral force analysis and the stage stress analysis under different conditions are carried out for the actual changes in the caisson structure. After applying initial stress to the shaft wall and bottom of the model, the change of stress and displacement is obtained. Finally, the results of stress and displacement change of the caisson are compared with the design requirements according to the cloud map. The conclusion that the caisson structure meets the design requirements complements the shortcomings of traditional caisson research. Considering that the stress of caisson structure is different during construction and operation, it is necessary to carry out finite element simulation of caisson structure under two conditions to analyze the variation of stress and displacement. The law is obtained by comparing the stress and displacement values of the two working conditions before and after.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV68;TV31

【参考文献】