| 李明超,张梦溪,沈扬,冯达,闵巧玲.高碾压混凝土重力坝分区材料-结构界面特性与变形协调仿真分析[J].水利学报,2020,51(1):3-13 |
| 高碾压混凝土重力坝分区材料-结构界面特性与变形协调仿真分析 |
| Deformation coordination simulation analysis of sectionalized material-structure interface properties of high RCC gravity dam |
| 投稿时间：2019-10-21 |
| DOI：10.13243/j.cnki.slxb.20190737 |
| 中文关键词: 高碾压混凝土重力坝 界面力学 变形协调 应力奇异性特征值 数值仿真 |
| 英文关键词: RCC gravity dam interface mechanics deformation coordination eigenvalue of stress singularity numerical simulation |
| 基金项目:国家自然科学基金项目（51879185）；国家优秀青年科学基金项目（51622904）；国家大坝安全工程技术研究中心开发基金（CX2019B02） |
|
| 摘要点击次数: 3837 |
| 全文下载次数: 1321 |
| 中文摘要: |
| 高碾压混凝土重力坝不同功能部位“结构特性”与“材料性能”的差异产生的变形协调问题直接关系到工程结构的安全运行，现阶段变形协调分析多是对结构变形和受力进行分析，对异种材料变形协调机理认识不足，缺乏理论基础研究。本文基于界面力学理论，考虑混凝土坝分区中常见的两种双材料界面形式与理想界面的连续边界条件，基于奇异性特征值的特征方程，提出了以应力奇异性特征值作为异种材料变形协调的评价指标，并通过有限元分析验证了理论计算的正确性与有效性；进而分析了界面结合角度和异种材料组合对单侧自由界面端与埋入界面折点处应力奇异性的影响，通过非均质有限元数值仿真分析了复合试件破坏模式，研究了抗压强度与应力奇异性特征值的关系；最后通过统计实际混凝土坝工程中不同坝段内的双材料界面的材料参数（弹性模量）与结构参数（界面形式与结合角度），计算奇异性特征值，评价了该工程中界面的变形协调特性，为高混凝土坝分区材料-结构设计与材料选取提供新的思路。 |
| 英文摘要: |
| The problem of deformation coordination caused by the difference of "structural characteristics" and "material properties" in different parts of high RCC dam is a direct result of the safety of hydraulic engineering structure. At present, deformation coordination analysis mostly focuses on structural deformation and stress analysis. However, the mechanism of deformation coordination of different materials has not been fully understood. Based on the theory of interface mechanics and considering the continuous boundary conditions of bimaterial interface,the equation of singularity eigenvalue is obtained,and the stress singularity eigenvalue is proposed as an evaluation index for the compatibility of deformation of different materials. The result of theoretical calculation was verified by finite element analysis; then the effects of interface angle and different material combination on the stress singularity are developed. The relationship between strength and stress singularity eigenvalues of composite specimens is analyzed by non-homogeneous finite element numerical simulation, and the material parameters (elastic modulus) and structural parameters (interface form and junction) of bimaterial interface in different sections of concrete dam are collected. The deformation compatibility characteristics of the interface of the project are evaluated by the singularity eigenvalues. The proposed method will provide a novel idea for the material-structure design and material selection of high RCC dam. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |