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中文摘要：
对于带缝运行的混凝土坝，裂缝的稳定性直接关系其安全性能，裂缝的时效变形反映了裂缝的稳定性和转异特征，可由时效的变化趋势对裂缝是否发生转异进行诊断．结合实际工程，基于裂缝的实测资料，利用小波分析提取裂缝的时效变形，然后采用相空间重构技术对时效变形重构相平面，由此识别裂缝的转异点，确定裂缝转异发生的时间，对裂缝的稳定性进行诊断．研究表明，所得结论与工程的实际情况一致．
英文摘要：
The stability of the crack in concrete dams during operation has impact on the safety of the dam. The time-dependent deformation of crack is related to the crack stability and abnormality. The abnormality of the dam crack can be detected by the time-dependent deformation. In this paper, According to observation data, the approach to detecting abnormality point of crack based on phase plane is proposed. First the time-dependent component of crack is extracted by applying wavelet analysis, then phase plane of crack is reconstructed by use of phase space reconstruction technique and the abnormality point is detected by phase plane plot. The results show that the method is effective.
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