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Title: Geostatistical analysis of cone penetration test (CPT) sounding using the modified Bartlett test
Authors: Phoon, K.-K. 
Quek, S.-T. 
An, P.
Keywords: Geostatistics
Level of significance
Modified Bartlett test
Random field
Run test
Issue Date: Apr-2004
Citation: Phoon, K.-K., Quek, S.-T., An, P. (2004-04). Geostatistical analysis of cone penetration test (CPT) sounding using the modified Bartlett test. Canadian Geotechnical Journal 41 (2) : 356-365. ScholarBank@NUS Repository.
Abstract: More in situ tests are typically carried out over the same volume of soil in comparison to laboratory tests on undisturbed borehole samples. Hence, geostatistical analysis of in situ test records should in principle provide a more accurate and representative overview of spatial variation. A natural probabilistic model for correlated spatial data is the random field. Although the random field provides a concise description of spatial variation, it poses considerable practical difficulties for statistical inference because of the underlying autocorrelation structure. This note presents an extended discussion of the modified Bartlett random field estimation procedure, which is capable of rejecting the null hypothesis of weak stationarity for spatially correlated data. In comparison with simple visual inspection and the standard run test, the modified Bartlett test is shown to provide three advantages: (i) it is a more consistent measure that is unaffected by the vagaries of subjective interpretation; (ii) it is sufficiently discriminative to decide if a section is stationary, even when visual clues are ambiguous; and (iii) it is capable of accommodating realistic constraints (e.g., short record length). The possibility of identifying secondary soil boundaries that may not be readily apparent from visual inspection of cone soundings, its robustness to alternate transformations of the cone data, and the sensitivity of the proposed procedure to different levels of significance are discussed. © 2004 NRC Canada.
Source Title: Canadian Geotechnical Journal
ISSN: 00083674
DOI: 10.1139/t03-091
Appears in Collections:Staff Publications

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