基于扩展共同中心点法的路面病害雷达测量  

Measurement of Pavement Diseases by GPR Using Extended Common Midpoint Method

作　　者：宋亮[1,2] 

机构地区：[1]长安大学公路学院,陕西西安710061 [2]新疆交通规划勘察设计研究院,新疆乌鲁木齐830001

出　　处：《公路交通科技》2017年第8期34-43,共10页Journal of Highway and Transportation Research and Development

基　　金：交通运输部建设科技项目(2013 318 J08 220)

摘　　要：为进一步提高利用探地雷达技术测量路面厚度及病害的精度与效率,保证测量结果可直接用于改扩建路面的设计,将扩展共同中心点法(the extended common midpoint,XCMP)引入了基于探地雷达的改扩建路面厚度及病害测量。利用XCMP,探地雷达可测定现有路面厚度和病害位置且无需借助钻心取样校准介电常数;同时,采用了一种多阵列的3D探地雷达,它能同时采集纵横两个方向的路面信息。借助不断发展的信号处理技术和数值处理技术,结合了3D探地雷达信号特征和XCMP法,建立扩建路面厚度及病害测量的通用方法并将上述方法用于连霍高速改扩建项目。结果表明,XCMP法可采集获得清晰的路面结构图像并推算出路面厚度及病害位置,设计的4个XCMP方案的检测误差分别为8.51%,7.62%,3.97%,4.36%,可见XCMP方案基本满足检测需求;同时XCMP法与其他方法对比结果表明其具有更高的精度,误差波动较小,误差可控性强。在此基础上,选取厚度检测精度最高的方案进行病害位置的判定,主要检测病害包括路基脱空、断裂和碎裂,反射裂缝,隐含裂缝。依据病害在探地雷达图像上的区别,采用感兴趣区域(ROI)提取进行病害定位,同时结合上述路面厚度检测结果确定病害的位置和尺寸。In order to further increase the precision and efficiency of measurement of pavement thicknesses and disasters using ground penetrating radar（ GPR） technique,and to make sure the detection result can be used for highway reconstruction and expansion, the extended common midpoint（ XCMP） method is introduced to measure pavement thicknesses and disaster. By using XCMP method,pavement thicknesses and disaster positions can be measured by GPR without demand for drilling core samples to calibrate dielectric constant. Meanwhile,one type of multi-array 3D GPR is used to collect the of cross-line and in-line pavement information. With the development of signal processing technology and numerical processing technology,a universal method combining with the property of 3D GPR signals and the XCMP method is developed to measure pavement thicknesses and disasters,then the universal method is used in reconstruction and expansion of Lianyungang—Khorgos Expressway. The result shows that（ 1） clear GPR images of highway structure can be collected and the thicknesses of pavement are calculated by XCMP,the detection accuracies of 4 XCMP schemes are 8. 51%,7. 62%,3. 97%,4. 36% separately,so XCMP scheme can meet the detection demand;（ 2） the comparative result shows that XCMP method has higher accuracy than others and the errors are controlled in a reasonable range and shows good performance of controllability onerrors. Based on these,pavement distresses are located using the scheme with the highest accuracy of thickness detection,the detected pavement distresses mainly including subgrade cavities,reflect cracks,conceal cracks. Based on the differences of distresses in GPR images,region of interest（ ROI） extraction is utilized to localize these distresses in GPR images,and the locations and sizes of distresses are determined combing with the thickness detection result. With the development of signal processing technology and numerical processing technology,a universal

关 键 词：道路工程 路面厚度检测 扩展共同中心点法 沥青路面 道路改扩建 

分 类 号：U416.2[交通运输工程—道路与铁道工程]