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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。
EDG nuclear density meter is a kind of non-destructive rapid compaction soil dry density test instrument, which has less application experience in China. In order to study the accuracy and suitability of the dry density test of EDG method, based on the testing mechanism of EDG, the causes of the error of EDG dry density test were analyzed based on the EDG method, sand filling method and drying method of loess samples. And the size of the test error. The results show that both the composite impedance and the capacitance-resistance ratio of soil are affected by both density and volumetric water content, which is the reason for the error of EDG method. The error of EDG method is not constant, but in some specific The test error is smaller in the range of moisture content and dry density, and the test error in other sections is larger. It is a precondition for the dry density test of EDG method to ensure the uniformity of soil material and control the moisture content of soil material within a small interval. In practice, the calibration model should be used to test the error analysis, a clear calibration model applicable moisture content and dry density range.