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The Newcastle Dilatometer (NDMT) developed by Akbar in 2001 has a distinctive feature that it
loads the soil with a rigid piston in place of flexible membrane as in the Marchetti Dilatometer
(MDMT). Based on the previous research works carried out using the NDMT in normally consolidated
soils, it has been found that the material and dilatometer indices from the NDMT data can be used to
classify the soils based on Marchetti and Crapps (1981) chart. However, in overconsolidated soils, the
Marchetti and Crapps (1981) chart for soil classification sometimes shows disagreement with other
methods in the prediction of soil type based on the NDMT data. This is also true with the Cone
Penetrometer (CPT) data. These findings are based on extensive testing carried out in alluvial soil
deposits at Kala Shah Kaku campus of the University of Engineering and Technology, Lahore. These
testing comprised particle size analysis in the laboratory in conjunction with the NDMT and CPT
testing in the field. This paper presents the data of penetration tests along with laboratory soil
classifications and explores the possible causes of disagreement in the prediction of true soil type
based on penetration tests in overconsolidated soils.
A. H. Khan, A. Akbar, K. Farooq, N. M. Khan, M. Aziz, H. Mujtaba. (2011) Soil Classification Through Penetration Tests, Pakistan Journal of Engineering and Applied Sciences, Volume 9, Issue 1.
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