基于小波变换的某重力拱坝背水坡转异裂缝序列的分析  

Analysis of Abnormal Crack Series of Downstream Slope of Gravity Arch Dam Based on Wavelet Transform

作　　者：杨景文[1,2] 赵二峰[1,2] 赵鲲鹏[1,2] 梁嘉琛 王欢[3] 李媛[4] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]河海大学水资源高效利用与工程安全国家工程研究中心,江苏南京210098 [3]四川大学水利水电学院,四川成都610065 [4]黄河上游水电开发有限责任公司李家峡发电分公司,青海西宁810008

出　　处：《水电能源科学》2015年第3期60-63,共4页Water Resources and Power

基　　金：江苏省杰出青年基金项目(BK20140039);国家自然科学基金项目(51279052);新世纪优秀人才支持计划资助项目(NCET-11-0628);水利部公益性行业科研专项经费项目(201201038)

摘　　要：裂缝转异诊断对分析大坝安全稳定运行有重要意义。将小波变换应用于大坝裂缝转异分析中,并结合某重力拱坝背水坡裂缝X18-1的实测数据,分别从小波系数图的过零点和极值点、多尺度下模极大值线及奇异性变化角度讨论其与裂缝转异时刻的关系,最终综合判断出裂缝的转异时刻。分析结果表明,小波系数图、模极大值线和奇异性均可反映裂缝的转异,但各自独立的诊断结果不完全相同,综合分析可准确判定裂缝的转异时刻,为裂缝转异诊断提供了新思路。The diagnosis of crack abnormality has important significance for the analysis of the dam safety and stable operation.The wavelet transform method is applied to analyze the dam crack abnormality.Combined with the X18-1crack measured data of downstream slope of a gravity arch dam,this paper discusses the relations with crack abnormality time from the zero-crossing points and extreme points of wavelet coefficients,wavelet modulus maxima lines under multiscales and changes of singularity.Finally,a comprehensive judgment of the time of crack abnormality is carried out.The results show that the wavelet coefficients figure,modulus maxima lines and singularity all can reflect the crack abnormality,but the separate diagnoses are not identical;a correct judgment about the abnormality time can be made by comprehensive analysis.Therefore,this study provides a new idea for diagnosis of crack abnormality.

关 键 词：重力拱坝 转异裂缝 小波变换 奇异性 

分 类 号：TV698.1[水利工程—水利水电工程]