水泥土截渗墙质量缺陷探地雷达正演响应特征  

Study on GPR Forward Response Characteristics of Cement- Soil Cutoff Wall's Quality Defects

作　　者：魏奎烨[1] 宋新江[1] 

机构地区：[1]安徽省.水利部淮委水利科学研究院,安徽蚌埠233000

出　　处：《人民黄河》2015年第1期50-53,共4页Yellow River

基　　金：水利部科技推广计划项目(TG1414)

摘　　要：水泥土截渗墙在水利工程中有着越来越广泛的应用,作为隐蔽工程,其质量检测多采用探地雷达等无损的方式。采用射线追踪方法正演模拟具有局部夹泥、脱空充气及脱空充水三种质量缺陷的水泥土截渗墙在剖面法和宽角法中的探地雷达响应,并采用快速傅里叶变换得到频率域的响应,通过对其在时间域、频率域的比较、分析,结果表明:局部夹泥时间域中表现为正极性反射波,振幅谱中有1个能量峰;脱空充气时间域中表现为强振幅正极性反射波,振幅谱中有2个能量峰;脱空充水时间域中表现为弱振幅负极性反射波,其振幅谱与无目标体时相似,均有4个能量峰,但二者相位谱差别较大,可根据相位谱加以判断。宽角法中上述目标体主要表现为振幅异常。Cement-soil cutoff wall has more and more widely application in the hydraulic engineering,as a concealed engineering,its quality detection often uses the GPR etc,to have a deeper understanding on the quality defects of the GPR response characteristics. By using ray trac-ing method,we got the GPR response under the conditions of local mud,disengaging with air and disengaging with water by profiling method and wide angle reflection and refraction（WARR）and got the frequency domain response by using FFT. By comparing the time domain and frequency domain response characteristics,the results show that：by profiling method,the GPR response characteristics of local mud in time domain is positive polarity reflected wave,the amplitude spectrum has one energy peak;disengaging with air in time domain is positive polarity and strong amplitude reflected wave,the amplitude spectrum has two energy peaks;disengaging with water in time domain is negative polarity and weak amplitude reflected wave,the amplitude spectrum has four energy peaks,it is similar to the non-target body,but they have the large difference between the two phase spectrums. By wide angle reflection and refraction（WARR）,the three objects are mainly presented amplitude anomaly.

关 键 词：水泥土截渗墙 质量缺陷 探地雷达 射线追踪法 响应特征 

分 类 号：TV871.4[水利工程—水利水电工程]