【作者】 王大伟；

【导师】 章青；

【作者基本信息】 河海大学 ， 工程力学， 2007， 硕士

【摘要】 随着拱坝建设的发展，我国目前正向技术难度更大、使用要求更高的300 m级的混凝土高拱坝迈进，拱高305m的锦屏拱坝就是一例。这一级别的拱坝超越了现有世界水平，对高拱坝稳定分析的研究就显得尤为重要。本文基于大型有限元仿真软件ANSYS，结合锦屏一级水电工程的科研项目“锦屏一级双曲拱坝开裂及坝肩抗滑稳定分析与安全评价”，运用三维弹塑性有限元仿真计算方法，对锦屏一级高拱坝坝体破坏及坝肩岩体的稳定性展开了系统的研究。论文首先介绍了非线性问题和弹塑性分析基本理论，在此基础上进一步深入介绍非线性有限元计算方法。接着，对岩土工程材料常用的屈服准则，Drucker—Prager准则等进行深入的理论研究，探讨各种条件下参数α、κ与c、φ间的关系。用数值计算方法来研究像拱坝这样复杂结构的稳定性问题，难点在于如何判断结构的整体破坏。本文分别采用收敛法、塑性区贯通法和位移突变法作为破坏判据。然后，在ANSYS中模拟基岩的初始地应力场，采用三维非线性有限元法，以自重和设计水压为基本荷载，利用超载法、降强法和抗滑稳定方法分析了锦屏高拱坝的失稳破坏过程，得到锦屏拱坝的整体稳定安全系数。最后，作者就一些需要进一步解决的问题提出展望更多还原

【Abstract】 Jinping is a huge project located on Yalong River in China. Its dam is concrete arch dam with Max height of 305.0m, which surpass Ingury and Xiaowan, and will be the highest arch dam in the world. The stability analysis of super-high arch dams is very important in this project. The paper is based on ANSYS, a big FEM simulation software. Integrated with a project of Jinping Water Power Station, the failure state and abutment stability are studied systematically with 3D elastic-plastic finite element method in this paper.First, the basic theory and method of elastic-plastic and nonlinear in FEM simulation analysis in rock engineering and water conservancy engineering are studied.The criterion of failure state is still a difficult problem, especially in the numerical analysis. In this thesis, based on the detailed introduction about these methods used at present time, the failure state is analyzed in theory, and then the two methods that are the limitative strain and plastic limit analysis are discussed. According to the calculation and analysis of those arch dams, the relation between the displacement jump method and plastic zone juncture method is discussed, and the displacement jump method is considered to be more convenient and effective.Then, the initial geological stress of dam site is simulated in ANSYS. Using three-dimensional nonlinear FEM and considering accumulative gravity and water pressure as initial load, overload method and margin of safety method are adopted to analyze the failure process of JinPing arch dam, and the safety factors of integral stability and characters of failure are acquired.Finally, some problems needed to be studied further are discussed.更多还原