EDG无核密度仪标定模型与测试误差的试验研究

发布时间：2018-04-17 05:26

  本文选题：土力学 + EDG无核密度仪　； 参考：《岩石力学与工程学报》2016年08期

【摘要】：EDG无核密度仪是一种无损快速的压实土干密度测试仪器,其在国内的应用经验较少。为研究EDG法干密度测试的准确性和适宜性,从EDG的测试机制出发,基于黄土试样的EDG法、灌砂法和烘干法测试结果,分析EDG法干密度测试产生误差的原因,以及测试误差大小。结果表明土的复合阻抗和电容电阻比均受密度和体积含水量两者的影响是造成EDG法测试产生误差的原因;EDG法干密度测试的误差大小并不是恒定值,而是在某些特定含水率和干密度区间内测试误差较小,其他区间测试误差较大;保证土料的均匀性,控制土料的含水率在较小区间内变化是EDG法干密度测试适用的前提条件;工程实践中宜针对采用的标定模型进行测试误差分析,明确标定模型适用的含水率和干密度范围。
[Abstract]:EDG seedless density meter is a kind of nondestructive and fast measuring instrument for the dry density of compacted soil, and its application experience in China is less.In order to study the accuracy and suitability of dry density measurement by EDG method, based on the test results of EDG method, sand filling method and drying method of loess samples, this paper analyzes the causes of errors and the size of measurement errors in EDG dry density testing based on the testing mechanism of EDG.The results show that the influence of density and volumetric water content on the composite impedance and capacitance resistance ratio of the soil is the cause of the error caused by the EDG method. The error of the dry density measurement of the EDG method is not constant.However, the measurement error is smaller in some specific water content and dry density intervals, but larger in others, and the precondition of EDG dry density testing is to ensure the homogeneity of soil material and control the variation of soil moisture content in small interval.In engineering practice, it is necessary to analyze the measurement error of the calibration model and determine the range of moisture content and dry density for the calibration model.
【作者单位】： 机械工业勘察设计研究院有限公司;陕西省特殊土工程性质与处理技术重点实验室;
【基金】：国家科技支撑计划项目(2013BAJ06B00)~~
【分类号】：TU415
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本文编号：1762281