| 陈大庆.土样比重的测量不确定度评定[J].地质与勘探,2013,49(3):523-527 |
| 土样比重的测量不确定度评定 |
| Evaluation of Measurement Uncertainty for Specific Gravity Tests of Soil Samples |
| 投稿时间：2011-12-17 修订日期：2012-06-28 |
| DOI： |
| 中文关键词: 比重 比重瓶法 标准不确定度 扩展不确定度 |
| 英文关键词: specific gravity, pycnometer method, standard uncertainty, expanded uncertainty |
| 基金项目:国家自然科学基金项目“金沙江上游晚更新世以来泥石流发育史与环境变迁”（编号 40901005）资助 |
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| 中文摘要: |
| [摘要] 土样比重的测量不确定度既判定了自身的可靠性，同时又影响了通过比重及其他一些参数换算得到的孔隙率、饱和度等指标的准确性。选用物理性质较为均匀的原状粉土做样品，基于《土工试验方法标准》（GB/T50123-1999），通过比重瓶法重复测量了样品的比重。根据《测量不确定度评定与表示》（JJF 1059-1999）的要求，分析了试验过程中影响因素的主要来源，建立了测量比重不确定度的计算模式，较系统地对其不确定度进行了评定。结果表明：土的比重测量误差主要由称量及不均匀性两个因素引起。试验条件下的土样比重测量结果的扩展不确定度为0.005。 |
| 英文摘要: |
| Abstract: Measurement uncertainty for specific gravity tests of soil samples affects its reliability, and also influences the accuracy of porosity and saturation obtained by transforming specific gravity and other parameters. A pail of undisturbed silt was taken as the specimen. The specific gravity of soil samples was measured by the pycnometer method based on “Standard for soil test method” (GB/T50123-1999). According to requirements of “Uncertainty Evaluation and Denotation of the Measurement Results”(JJF 1059-1999), we analyzes the factors affecting measurement accuracy, then builds a calculation model for the measurement uncertainty, and then evaluates the measurement uncertainty for specific gravity of soil Samples. The result shows that the contribution to the uncertainty of the measurement results comes mainly from weighing and inhomogeneity. The expanded uncertainty of measurement results of the specific gravity of soil samples is 0.005 under the proposed testing conditions. |
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