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Development of a new sand particle clustering method with respect to its static and dynamic morphological and structural characteristics

Lim , Alvin John Meng Sung (2014) Development of a new sand particle clustering method with respect to its static and dynamic morphological and structural characteristics. PhD thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Characteristics of particle morphology (size and shape) are key factors that govern the interparticle behaviour of granular soils. However, the current status of its fundamental research has not reach significant development for its inclusion in geotechnical modelling of granular materials. Particle morphology parameters were prioritised only in classifying the particle size and not particle shapes in current geotechnical standards. Therefore, this research is focused in establishing proper classification methods of particle shapes and comparing it with the classification of particle sizes on its importance of its impact on the interparticle behaviour of the soil. This was done using five strategically chosen sand samples of different morphologies tested under static and dynamic loading. A number of sand particles fiom each sample were first quantified to obtain their shapes using a digital microscope according to the shape parameters of sphericity (S), roundness (R) and regularity (p). To find a single representative establish value of the shape parameters, a new statistical approach using cluster analysis with the addition of probability distributions were introduced. From tKe particle size and the modelled values of the shape parameters, correlations were obtained from the results of the static and dynamic loading test. Direct shear test showed relationships that incorporates the critical state stress, the normal stress and the particle size and shape parameters of the samples which is significant in predicting the critical shear strength behaviour of the soil. Improvement of the classical modified Mohr-Coulomb shear strength expression was also obtained to take into account a factored dilatancy angle value that is dependent to the properties of particle morphology. Dynamic loading analysis showed that particle level interaction played an important role in affecting liquefaction potential characteristics, the resilient modulus, M,, dynamic shear modulus, G, and damping ratio, D. These dynamic loading parameters were found to be intrinsically dependent on the effective size (Dro), S, R and p. The findings contributes in improving a novel hndamental understanding on the development of parametric correlations to provide good estimates of the static and dynamic strength behaviour of sands based on the new methods of particle morphology classification.

Item Type: Thesis (PhD)
Uncontrolled Keywords: morphology; statistical modelling; shear strength; dilatancy; dynamic shear modulus; damping ratio
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Depositing User: Normajihan Abd. Rahman
Date Deposited: 30 May 2016 07:57
Last Modified: 30 May 2016 07:57
URI: http://eprints.uthm.edu.my/id/eprint/8053
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