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基于探地雷达的路基土压实度确定

DOI: 10.3969/j.issn.1674-0696.2015.02.13, PP. 58-62

Keywords: 道路工程,路基土,压实度,介电常数模型,探地雷达(GPR),质量检测,roadengineering,subgradesoil,compactness,dielectricmodel,groundpenetratingradar(GPR),qualitydetection

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Abstract:

:?以3种常见的路基材料(粉土、中砂及砾砂)为试验对象,引入探地雷达测试的各试样介电常数,通过室内土工试验测试各试样的含水量与密度,对介电常数的两种体积混合模型(均方根模型和线性模型)进行验证,并利用MATLAB软件对介电常数的实测值与计算值进行处理。结果表明:介电常数实测值与模型计算值有很大出入,但两者之间有较好的相关性,利用这种相关性可对原模型进行改进,进而可利用改进后的模型反演路基压实度。以粉土为例,通过大量试验,利用MATLAB软件进行多元非线性回归,建立该粉土路基的介电常数经验模型。将改进后的介电常数模型及粉土经验模型应用于实际工程中,并与灌砂法得到的压实度进行对比,结果基本一致。

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