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SDG无核密度仪是一种无损快速的压实土干密度测试仪器,其开发和引进时间较短,缺少使用经验。基于黄土地区古土壤的SDG和灌砂法、烘干法测试结果,分析了SDG标定的作用和效果,SDG测试产生误差的原因,绘制了干密度测试结果的误差分布图。结果表明,标定的作用在于使仪器内置的计算模型与实际更接近,但仍与实际存在差别是其产生测试误差的原因;压实土真实的干密度和质量含水率均会影响SDG干密度测试结果,在质量含水率与干密度组成的坐标系中,干密度测试结果相对可靠的区域为一斜向上的条带状区域;只有当压实土的质量含水率在较小区间分布时,SDG测试得到的不同试样干密度大小排序才和实际一致。
SDG nuclear densitometer is a non-destructive rapid compaction soil dry density test instrument, its development and introduction of a shorter time, the lack of experience. Based on the results of SDG and sand filling method and drying method in paleosol of loess area, the effect and effect of SDG calibration, the reason of SDG test error and the error distribution of dry density test result were drawn. The results show that the calibration function is to make the calculation model of the instrument closer to the actual, but still the actual difference is the reason of the test error; the real dry density and the mass moisture content of compacted soil will affect the SDG dry density test As a result, in the coordinate system consisting of mass water content and dry density, the relatively reliable dry density test results are an oblique strip-shaped area. Only when the mass moisture content of compacted soil is distributed in a smaller interval, SDG Test samples obtained by the dry density of the order of magnitude and the actual line.