Spatial and temporal variability in a residual soil profile

Mellish, Daniel, Lacey, David, Look, Burt, & Gallage, Chaminda (2014) Spatial and temporal variability in a residual soil profile. In Hossain, Zakaria & Shiau, Jim (Eds.) Proceedings of Fourth International Conference – GEOMATE 2014 : Geotechnique, Construction Materials & Environment, The GEOMATE International Society, Brisbane, Australia, pp. 151-156.


It is well understood that that there is variation inherent in all testing techniques, and that all soil and rock materials also contain some degree of natural variability. Less consideration is normally given to variation associated with natural material heterogeneity within a site, or the relative condition of the material at the time of testing. This paper assesses the impact of spatial and temporal variability upon repeated insitu testing of a residual soil and rock profile present within a single residential site over a full calendar year, and thus range of seasonal conditions. From this repeated testing, the magnitude of spatial and temporal variation due to seasonal conditions has demonstrated that, depending on the selected location and moisture content of the subsurface at the time of testing, up to a 35% variation within the test results can be expected. The results have also demonstrated that the completed insitu test technique has a similarly large measurement and inherent variability error and, for the investigated site, up to a 60% variation in normalised results was observed. From these results, it is recommended that the frequency and timing of insitu tests should be considered when deriving geotechnical design parameters from a limited data set.

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ID Code: 79881
Item Type: Conference Paper
Refereed: Yes
Keywords: Inherent Soil Variability, Measurement Error, Temporal Variability, Coefficient of Variation, Dynamic Penetrometer, Moisture Content
ISBN: 9784990595838
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 The GEOMATE International Society
Deposited On: 08 Jan 2015 00:16
Last Modified: 14 Jan 2015 04:21

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