不同小波基对水泥路面脱空信号时频特征的影响  

Influence of different wavelet bases on time-frequency characteristics of cement pavement GPR void signal

作　　者：李有鑫 郭宇堃 余秋琴 罗婷倚 张军[1,2] 刘斌[3] LI YouXin;GUO YuKun;YU QiuQin;LUO TingYi;ZHANG Jun;LIU Bin(National Engineering Laboratory for Highway Maintenance Equipment,Xi'an 710064,China;Key Laboratory of Road Construction Technology and Equipment,Ministry of Education,Xi'an 710064,China;Guangxi Beitou Highway Construction Investment Group Co.,Ltd.,Nanning 530029,China)

机构地区：[1]长安大学公路养护装备国家工程实验室,西安710064 [2]长安大学道路施工技术与装备教育部重点实验室,西安710064 [3]广西北投公路建设投资集团有限公司,南宁530029

出　　处：《地球物理学进展》2023年第4期1815-1823,共9页Progress in Geophysics

基　　金：广西省交通运输行业重点科技项目(19-09);陕西省自然科学基础研究计划(2022JM-249);陕西省交通厅项目(20-30X)联合资助

摘　　要：水泥路面脱空是导致路面板块断裂的主要因素,及早确定脱空区域的范围,可为水泥路面结构安全性的力学分析提供依据,避免断板现象.以水泥路面脱空病害为研究对象,采用正演模拟方法研究了脱空形状和深度对探地雷达(Ground Penetrating Rada,GPR)响应信号的影响.使用连续小波变化(Continuous Wavelet Transform,CWT)提取脱空区域信号的时频域特征,并用CWT时频特征重构脱空区域的3D模型.在此基础上,研究了不同小波基对脱空特征的影响,并在室内模型上进行验证实验.结果表明,正演模拟与室内模型的脱空特征一致,且脱空与正常路面的GPR信号在时频域差异明显,CWT图谱能量集中区域可表征脱空的深度和范围;不同小波基函数的CWT处理结果不同,相比于morse小波和bump小波,amor小波的CWT的处理结果更精确,更能反映脱空的时频特征;CWT时频特征可实现脱空病害的3D可视化,为分析脱空区域范围提供参考,这为后续开展道路养护提供理论依据.The void of cement pavement is the main factor leading to the fracture of pavement slab.If the void range can be determined,it can provide a basis for the mechanical analysis of the structural safety of cement pavement and avoid the phenomenon of slab broken.Taking the void of cement pavement as the research object,the influence of void shape and depth on Ground Penetrating Radar(GPR)response signal is studied by forward simulation method.The time-frequency characteristics of void area signal are extracted by Continuous Wavelet Transform(CWT)to characterize the void disease,and the CWT time-frequency characteristics are used to reconstruct the 3D model of void.On this basis,the effects of different wavelet bases on the void characteristics are studied.An indoor model is constructed to verify the effectiveness of the proposed CWT time-frequency characteristics to characterize the void.The results show that the void characteristics of the forward simulation are consistent with those of the lab physical model.The GPR signal of the void and the normal pavement is significantly different in time and frequency domain.The energy concentration area in CWT spectrum can characterize the depth and range of the void.Different wavelet basis functions have different CWT results,while compared with Morse wavelet and bump wavelet,amor wavelet has more accurate CWT processing results and can better reflect the time-frequency characteristics of void.CWT time-frequency feature can realize 3D visualization of void area,which is useful for analyzing the range of void area and provide theoretical basis for subsequent road maintenance.

关 键 词：水泥路面 脱空病害 探地雷达 小波基 连续小波变换 

分 类 号：P631[天文地球—地质矿产勘探]