高拱坝局部损伤监测与多尺度安全评价模型研究

项目名称： 高拱坝局部损伤监测与多尺度安全评价模型研究

项目编号： No.50879024

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 交通运输

项目作者： 郑东健

作者单位： 河海大学

项目金额： 30万元

中文摘要： 高拱坝都不同程度地处带伤(裂缝)服役状态,包括二滩和龙羊峡拱坝。目前损伤裂缝的点式监测和单尺度评价方法有明显局限性。项目通过理论和试验研究，提出了基于光纤光损耗的混凝土拱坝局部裂缝损伤综合监测方法，将常规点式监测扩展到线和区域监测，且有较强的监测结构裂缝发生和发展的敏感性和适应性；应用证据理论,建立了高拱坝监测信息的多层次递阶集成融合体系，提出了高拱坝性态监测信息的融合方法；基于实测资料，应用熵和突变等理论，分析了局部损伤累积演变和结构整体安全的关系规律，建立了高拱坝裂缝损伤的熵变分析方法以及时间和空间多尺度安全评价模型；研究了静力变形和动力响应的特点，分析了高拱坝裂缝损伤对动力响应的影响，提出了基于变形的高拱坝整体安全度分析方法，探讨了基于频率的高拱坝整体安全和承载能力演化分析模型。结合数值模拟和概率与稳定性理论，提出了高拱坝局部损伤和整体安全的多尺度监控指标分析方法。应用综合评价理论，建立了高拱坝整体安全性态的多层次综合评价模型。在国内外重要学术期刊和会议发表论文49篇，其中SCI收录11篇、EI收录10篇。

中文关键词： 高拱坝；裂缝监测；多尺度；信息融合；安全评价

英文摘要： All of high arch dam works with some damage(cracks) in some degree, including Ertan and Longyanxia arch dam. At the present time the point-style monitoring and single-scale assessment methods have their limitation for diagnosing the damage status. Based on theoretical analysis and model experiment, local crack damage monitoring method for concrete arch dam using fiber bend loss measurement is presented. It extended the traditional point-monitoring method to line / area-monitoring with higher sensitive and applicability. Then multidivisional hierarchy system of monitoring information fusing for high arch-dam is established based on D-S evidence theory, the monitoring information fusing method is obtained. At the same time, based on arch dam observation, the analysis method of crack evolvement using entropy theory and multiscale safety monitoring model for high arch dam is developed. Combining with numerical analysis and observation, whole safety degree of high arch dam and ultimate bearing capacity of high concrete arch dam with cracks in service using natural vibration frequency is obtained. And safety monitoring indexes of arch dam is given. In the end, the amalgamative assessment of distribute and point monitoring data under the multi-crack situation and the relationship between local damage accumulation and whole arch dam safety is discussed. Multilayer safety assessment model of whole arch dam is established. 49 papers at internal and oversea journal or conference (including 11 SCI and 10 EI papers) have been published during project period.

英文关键词： high arch dam; crack monitoring; multiscale; informatio fusing;safety assessment