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材料导报  2021, Vol. 35 Issue (4): 4092-4098    https://doi.org/10.11896/cldb.19120099
  无机非金属及其复合材料 |
基于探地雷达的密级配覆水沥青层的空隙率检测
崔立龙1, 凌天清2, 曾凡贵3, 梁丽娟4, 李汝凯1
1 重庆交通大学土木工程学院,重庆 400074
2 重庆交通大学建筑与城市规划学院,重庆 400074
3 重庆建工住宅建设有限公司,重庆 400015
4 贵阳市城市发展投资集团股份有限公司,贵阳 550000
Estimation of Air Void Content of Dense Graded Water-covering Asphalt Layer Based on GPR
CUI Lilong1, LING Tianqing2, ZENG Fangui3, LIANG Lijuan4, LI Rukai1
1 College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2 College of Architecture and Urban Planning, Chongqing Jiaotong University, Chongqing 400074, China
3 Chongqing Construction Residential Engineering Co., Ltd, Chongqing 400015, China
4 Guiyang Urban Development & Investment (Group) Co., Ltd, Guiyang 550000, China
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摘要 为了解决目前探地雷达金属板反射法无法对覆水沥青层空隙率进行检测的问题,建立三种不同脉冲波入射角的路面结构FDTD数值模型,研究脉冲波色散现象对单色子波反射系数的影响,在干-湿双层体系的假设前提下,考虑脉冲波入射角,以全波形反演理论为基础,提出了一种非线性检测算法,在路表覆水的条件下利用探地雷达获得干燥沥青层的介电常数与空隙率,并建立七种不同含水量干-湿双层体系的FDTD数值模型并通过实验室实测对该方法的可靠性进行验证。研究结果表明:在三种数值模型脉冲波入射角范围内,单色子波反射系数变异性很小,可视为常数,即入射波各频率点对应的激励值相同;通过非线性检测算法重构而得的合成脉冲波与实际接收波具有较高吻合度,金属板反射法与非线性检测法介电常数测量误差随湿沥青层含水量升高而增大,但非线性检测算法误差增长远小于金属板反射法;与金属板反射法相比,探地雷达非线性检测算法所获得的介电常数相对误差由10.9%降至1.6%,沥青混合料毛体积密度相对误差由4.6%降至1.1%,空隙率相对误差由24.9%降至7.2%,证明非线性检测算法可有效消除路表覆水的影响,准确计算干燥沥青层的介电常数及空隙率,为沥青面层压实质量实时监控及智能压实技术提供一种精确、高效的方式。
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崔立龙
凌天清
曾凡贵
梁丽娟
李汝凯
关键词:  路面工程  探地雷达  空隙率  密级配覆水沥青层  介电常数  FDTD数值模型    
Abstract: In order to solve the problem that ground penetrating radar (GPR) can not predict the air void content of water-covering asphalt layer with metal plate reflection method, three kinds of FDTD numerical models of pavement structure with different incident angles of pulse are established to study the influence of the dispersion of pulse on the reflection coefficient of monochromatic wavelet. Under the assumption of dry-wet layers system, a nonlinear calculation algorithm is proposed based on the theory of full waveform inversion with the considering of the incident angle of pulse. The dielectric constant and air void content of dry asphalt layer can be obtained through the nonlinear calculation algorithm utilizing GPR when the surface of layer is covered water. The reliability of the algorithm is validated by employing FDTD numerical models of dry-wet layers system with seven different moisture contents as well as the laboratory test. The results show that in the range of incidence angle of three numerical models, the variation of reflection coefficient of monochromatic wavelet is very small, which can be regarded as a constant, meaning the excitation value of incident wavelet corresponding to each frequency is the same. The synthetic pulse reconstructed by nonlinear calculation algorithm match the real wave well. The error of dielectric constant estimated by metal plate reflection method and nonlinear calculation algorithm increases with the rising of moisture content of wet asphalt layer, while the error growth of nonlinear calculation algorithm is much smaller than that of metal plate reflection method. Compared with the metal plate reflection method, the relative error of the dielectric constant, the bulk specific density of asphalt mixture and the air void content obtained by the nonlinear calculation algorithm are reduced from 10.9% to 1.6%, from 4.6% to 1.1%, and from 24.9% to 7.2%, which proves the nonlinear calculation algorithm can effectively eliminate the influence of water covering on the asphalt layer to calculate the dielectric constant and air void content of dry asphalt layer accurately, providing an accurate and effective way for the real-time monitoring of asphalt layer compaction quality and intelligent compaction technology.
Key words:  pavement engineering    ground penetrating radar    air void content    dense graded water-covering asphalt layer    dielectric constant    FDTD numerical model
               出版日期:  2021-02-25      发布日期:  2021-02-23
ZTFLH:  U418  
基金资助: 重庆市技术创新与应用发展专项面上项目(cstc2019jscx-msxmX0296);道路结构与材料交通运输行业重点实验室(交通运输部公路科学研究所)2019年度开放基金;重庆交通大学研究生教育创新基金项目(2018B0102)
通讯作者:  277087149@qq.com   
作者简介:  崔立龙,重庆交通大学博士研究生,主要从事基于探地雷达的沥青路面无损检测与养护工作。
凌天清,重庆交通大学,教授,博士研究生导师,1996年博士毕业于同济大学,主要从事路基路面设计与维修养护工作。
引用本文:    
崔立龙, 凌天清, 曾凡贵, 梁丽娟, 李汝凯. 基于探地雷达的密级配覆水沥青层的空隙率检测[J]. 材料导报, 2021, 35(4): 4092-4098.
CUI Lilong, LING Tianqing, ZENG Fangui, LIANG Lijuan, LI Rukai. Estimation of Air Void Content of Dense Graded Water-covering Asphalt Layer Based on GPR. Materials Reports, 2021, 35(4): 4092-4098.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.19120099  或          http://www.mater-rep.com/CN/Y2021/V35/I4/4092
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