裂縫寬度探地雷達波場響應(yīng)的數(shù)值研究
[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).
【作者單位】: 河南工程學(xué)院資源與環(huán)境學(xué)院;河南高速公路試驗檢測有限公司;中國地質(zhì)大學(xué)地球物理與空間信息學(xué)院;黃淮學(xué)院建筑工程學(xué)院;
【基金】:河南省高等學(xué)校重點科研項目(15A170005) 河南工程學(xué)院博士基金(D2014008) 河南省重點科技攻關(guān)項目(152102310241)聯(lián)合資助
【分類號】:P631.3
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1 馮德山;王s,
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