Statistical analysis of friction sleeve length effects on soil classification
Statistical analysis of friction sleeve length effects on soil classification
复制标题
摩擦套长度对土壤分级影响的统计分析
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
J. DeJong
中科院分区：
文献类型：
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作者：
D. Saussus;J. D. Frost;J. DeJong
圆锥贯入试验(CPT)提供了穿透地下时遇到的尖端阻力、套筒摩擦和孔压的轮廓。这些参数被直接或间接地用来对现有的土壤类型进行分类并获得岩土设计参数。然而，这些参数的测量方式存在根本差异。本文介绍了一项研究的结果，该结果表明，由于标准摩擦套筒的长度与测量增量相比，套筒摩擦测量引入了不必要的冗余。此外，高的套筒长度与测量增量比导致摩擦数据的过滤和平滑，从而导致土壤和锥形套筒之间的摩擦力的可变性被低估。通过使用合成产生的摩擦剖面和估计将使用不同长度的袖子测量的剖面，论证了理解袖长对测量的作用的重要性。图中举例说明了土壤作为用于获得每个剖面的袖长的函数而被分类的差异。提出了解决方案，以验证合成的套筒摩擦剖面，论证了套筒对数据的过滤和平滑作用，并解释了套筒长度对土壤分类的影响。版权所有©2004 John Wiley&Sons，Ltd.
The cone penetration test (CPT) provides profiles of the tip resistance, sleeve friction, and pore water pressure encountered while penetrating the subsurface. These parameters are used either directly or indirectly to classify the soil types present and to obtain geotechnical design parameters. However, fundamental discrepancies exist in the manner by which these parameters are measured. This paper describes the results of a study that shows the sleeve friction measurement introduces unnecessary redundancy due to the length of the standard friction sleeve compared to the measurement increment. Further, the high sleeve length to measurement increment ratio results in filtering and smoothing of the friction data, thereby causing the variability of the friction between the soil and the cone sleeve to be underestimated. The importance of understanding the role of the sleeve length on measurements is demonstrated using synthetically generated friction profiles and estimating the profiles that would be measured using sleeves of different lengths. Differences in how the soils are classified as a function of the sleeve length used to obtain each profile are illustrated. Solutions are presented to validate the synthetic sleeve friction profiles, to demonstrate the filtering and smoothing effects of the friction sleeve on the data, and to explain the implications of the sleeve length on soil classification. Copyright © 2004 John Wiley & Sons, Ltd.