基于CMOR小波扩展特性的基础工程无损诊断

NONDESTRUCTIVE MONITORING OF FOUNDATION ENGINEERING BY UTILIZING EXTENDED PROPERTY OF CMOR WAVELET

为了适应基础工程高精度无损诊断的要求 ,提出了中心频率参数Fc 超出小波允许条件取较小值 ,使其时域分析精度近似达到高斯实小波水平的CMOR小波扩展特性 ,从而完善了CMOR小波的反射波分析能力。在小波允许条件下 ,CMOR小波对反射波进行动力特性分析而实施介质损伤识别 ,在扩展特性下 ,CMOR小波对反射波进行突变检测而实施损伤定位 ,两者相结合构建了一条完备的基于反射波CMOR小波分析的基础工程无损诊断技术路线 ,并开发了具有强计算能力和可视化特性的相应软件系统。在地下连续墙无损诊断的实例分析中 ,CMOR小波扩展特性提高时域精度的有效性得到具体评价 ,所提供技术路线的可行性得以验证。

The extended property of CMOR wavelet,that its time resolution is approximate to that of Gaussian real wavelet if assining a smaller value of the center frequency as the admissbility condition,is proposed for realizing the precise monitoring of foundation engineering.This property is an effective complement for CMOR wavelet to analyze reflection wave.Depending on the dynamic property analysis of reflection wave by CMOR wavelet under admissibility condition,the media damages may be well identified,and depending on the break detection of reflection wave by CMOR wavelet under extended property,the media damage positions may be easily located.The combination of the above two aspects constructs a self-contained technology routine of foundation engineering nondestructive monitoring based on reflection wave analysis using CMOR wavelet,and that the corresponding software with excellent performance of both computation and visual presentation is developed.In the nondestructive monitoring of a diaphragm wall,it is shown the the precision of CMOR wavelet for locating damage under extended property is almost equivalent to that of Marr wavelet and the proposed technology routine is feasible and effective.