混凝土坝裂缝性态转异机理及其诊断方法研究

项目名称： 混凝土坝裂缝性态转异机理及其诊断方法研究

项目编号： No.51309195

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 水利工程

项目作者： 李占超

作者单位： 西北农林科技大学

项目金额： 25万元

中文摘要： 混凝土坝裂缝及其对结构安全的影响一直是水工结构学科的热点和难点。目前尚无材料和结构相统一的裂缝性态转异准则，无法反映裂缝性态转异与裂缝可靠性之间的关系，也无相应的裂缝性态转异诊断方法。本项目重点针对"混凝土坝裂缝性态转异诊断"主题，依据坝工学、断裂力学、应用数学等学科原理及其多学科交叉，通过现代测试技术、工程监测、大型室内外试验等多手段综合，充分利用混凝土坝裂缝安全监测资料，以裂缝口张开位移为指标，构建反映裂缝亚临界扩展的混凝土坝裂缝性态转异准则，揭示混凝土坝裂缝性态的转异机理，完善混凝土坝裂缝诊断的理论体系；在此基础上，以混凝土坝裂缝可靠性分析为纽带，分别从安全监控事后诊断及在线诊断两方面，建立反映裂缝性态转异机理的混凝土坝裂缝诊断方法。研究成果为混凝土坝安全监控提供科学依据及方法，具有重要理论意义与推广应用价值。

中文关键词： 混凝土坝；裂缝性态；转异机理；转异诊断；安全监控

英文摘要： Crack in concrete dam and its impact on structural safety are always the difficult issue and hotspot in the subject of hydraulic structure. However, there is no abnormality criterion of crack behavior from the unified perspective of material and structure at present. Relationships between abnormality of crack behavior and reliability of the crack are not reflected. Thus the corresponding abnormality diagnosis methods of crack behavior in concrete dam are missing. Based on the principles and multi-discipline integration of dam engineering science, fracture mechanics, applied mathematics and so on and through the multi-research-mean consolidation of modern test technology, structural monitoring, large scale tests and so on, the project focuses on abnormality diagnosis of crack behavior in concrete dam. Taking full advantage of the crack monitoring data and taking crack mouth opening displacement as the indicator, the abnormality criterion of crack behavior is constructed, which is able to reflect the subcritical propagation of crack in concrete dam. And the purpose of constructing this criterion is to reveal the abnormality mechanism of crack behavior and perfect the crack diagnosis theoretical system. On this basis, taking reliability of crack as the ligament, the abnormality diagnosis methods of crack behavior i

英文关键词： concrete dams；crack behavior；abnormality mechanism；abnormality diagnosis；safety monitoring