混凝土调压井结构极限破坏状态分析研究

发布时间：2018-04-22 22:31

本文选题：圆筒式调压井 + 有限元法　；参考：《昆明理工大学》2015年硕士论文

【摘要】：随着我国对用电量的需求越来越大,越来越多的水电站在修建。调压井在保障水电站的正常运行起着非常重要的作用,它的发展也越来越快。调压井目前的发展趋势表现为：直径越来越大,布置和结构形式也越来越多种多样。传统的调压井分析方法一一薄壁圆柱筒法,只能分析小型调压井；而对于大直径调压井,若仅采用传统结构力学方法进行调压井设计和计算,其结果往往与设计要求偏差较大。有限单元法被广泛运用于实际工程,可引入有限单元法求解大直径调压井。本文主要研究内容有以下几条：1、对调压井功能和结构构造进行基本介绍；以及调压井的两种分析方法：薄壁圆柱筒法与有限元法；阐述了调压井主要材料一一混凝土的本构关系、屈服准则及破坏准则等。2、选用三分点加载试验梁,运用William-Warnke五参数破坏准则对梁进行数值模拟分析。通过对数值仿真得出的极限荷载、挠度与荷载关系曲线和实验结果相比较,两者结果较为吻合,可见William-Warnke五参数破坏准则能够模拟混凝土这种材料力学行为。3、运用有限单元法,选取某一圆筒式调压井进行数值模拟分析。主要分析①衬砌单独工作时,衬砌出现裂缝时的水位以及衬砌所能承受的极限水位。②考虑衬砌和围岩共同作用时,为保证衬砌不出现裂缝时围岩弹性模量的取值范围。③围岩弹性模量为某一定值时衬砌的工作状态。④不同水位、不同围岩弹性模量时衬砌裂缝发展情况,应力以及位移的变化情况。
[Abstract]:With the increasing demand for electricity consumption in China, more and more hydropower stations are being built. Surge well plays a very important role in ensuring the normal operation of hydropower station, and its development is getting faster and faster. The development trend of surge wells is as follows: the diameter is getting larger and larger, and the layout and structure are more and more diverse. The traditional analysis method of regulating wells, thin-walled cylindrical tube method, can only analyze small ones, but for large diameter surge wells, if only the traditional structural mechanics method is used to design and calculate the surge wells, the results often deviate greatly from the design requirements. Finite element method (FEM) is widely used in practical engineering. The main contents of this paper are as follows: 1. The basic introduction of the function and structure of the surge well, and the two analytical methods of the well: the thin-walled cylinder method and the finite element method. The constitutive relation, yield criterion and failure criterion of concrete, the main material of the surge well, are expounded. The three-point loading test beam is selected and the William-Warnke five-parameter failure criterion is used to simulate the beam. The numerical simulation results of ultimate load, deflection and load relation curve are in good agreement with the experimental results. It can be seen that the William-Warnke five-parameter failure criterion can simulate the mechanical behavior of concrete of this material by using finite element method. A cylinder type pressure regulating well is selected for numerical simulation and analysis. This paper mainly analyzes the water level when the lining appears cracks and the limit water level that the lining can bear when the lining works alone, when the joint action of the lining and the surrounding rock is taken into account. In order to ensure the value range of elastic modulus of surrounding rock when the lining does not appear crack, .3 the elastic modulus of surrounding rock is the working state of lining with certain value. 4 different water level, different elastic modulus of surrounding rock, and the development of lining crack when the elastic modulus of surrounding rock is different. Changes in stress and displacement.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV732.51

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