裂缝宽度探地雷达波场响应的数值研究

发布时间：2019-03-11 13:47

【摘要】：裂缝是沥青混凝土公路路面的常见病害,为了研究沥青混凝土中隐含裂缝的宽度与其探地雷达波场之间的对应变化关系,本文基于各结构层沥青混凝土的多相离散随机介质模型参数,应用量化约束多相离散随机介质模型建模算法,构建了与公路各结构层实际情况更相符的多相离散随机介质三维模型,并基于商用探地雷达蝶形天线三维模型,数值模拟与对比分析了探地雷达波在多相离散随机介质和均匀介质中的传播特征,研究了探地雷达波场随裂缝宽度变化的函数关系.研究结果表明:探地雷达波在多相离散随机介质中发生了散射,致使其数值模拟剖面具有明显的随机扰动特征和"噪声",降低了探地雷达对裂缝的成像能力;随着裂缝宽度由窄变宽,其在探地雷达剖面图上的横向异常宽度差异较小,但裂缝顶端绕射波振幅强度与裂缝宽度之间具有明显的规律性,这为探地雷达定量估算公路结构层隐含裂缝宽度提供了理论依据.
[Abstract]:Crack is a common disease of asphalt concrete pavement. In order to study the relationship between the width of hidden crack in asphalt concrete and its ground penetrating radar wave field, the relationship between crack width and ground penetrating radar wave field in asphalt concrete is studied. In this paper, based on the parameters of multi-phase discrete random medium model of asphalt concrete with each structure layer, the quantitative constrained multi-phase discrete random medium model modeling algorithm is applied. Based on the 3D model of commercial ground penetrating radar butterfly antenna, a three-dimensional model of multi-phase discrete random medium is constructed, which is more consistent with the actual situation of each structure layer of highway. The propagation characteristics of ground penetrating radar (GPR) wave in multi-phase discrete random medium and uniform medium are analyzed by numerical simulation and comparative analysis, and the functional relationship between GPR wave field and crack width is studied. The results show that the ground penetrating radar (GPR) wave is scattered in the multi-phase discrete random medium, which leads to the obvious random disturbance and "noise" of the numerical simulation section, which reduces the imaging ability of GPR to crack. With the crack width changing from narrow to wide, there is little difference in transverse abnormal width on the ground penetrating radar profile, but there is an obvious regularity between the amplitude intensity of diffraction wave at the crack tip and the crack width. This provides a theoretical basis for the quantitative estimation of the hidden crack width of highway structure layer by ground penetrating radar (GPR).
【作者单位】：河南工程学院资源与环境学院;河南高速公路试验检测有限公司;中国地质大学地球物理与空间信息学院;黄淮学院建筑工程学院;
【基金】：河南省高等学校重点科研项目(15A170005) 河南工程学院博士基金(D2014008) 河南省重点科技攻关项目(152102310241)联合资助
【分类号】：P631.3

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