基于探地雷达的路基土压实度确定

发布时间：2018-06-20 23:22

本文选题：道路工程 + 路基土　；参考：《重庆交通大学学报(自然科学版)》2015年02期

【摘要】：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。
[Abstract]:Taking three common subgrade materials (silt, medium sand and gravel sand) as test objects, the dielectric constant of each sample measured by GPR is introduced, and the moisture content and density of each sample are measured by indoor geotechnical test. Two kinds of volume mixing models of dielectric constant (root mean square model and linear model) were verified, and the measured and calculated dielectric constant values were processed by MATLAB software. The results show that there is a great difference between the measured values of dielectric constant and the calculated values of the model, but there is a good correlation between them. The former model can be improved by using this correlation, and the compaction degree of roadbed can be retrieved by the improved model. Taking silty soil as an example, the empirical model of dielectric constant of silty soil roadbed is established by using MATLAB software to carry out multi-element nonlinear regression through a large number of tests. The improved dielectric constant model and silt empirical model are applied to practical engineering, and the results are in good agreement with the compaction obtained by the sand filling method.
【作者单位】：河南城建学院土木工程系;
【基金】：河南省科技攻关计划项目(112102210369)
【分类号】：U416.1

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