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Influence of deposition density on undrained shear strength parameters of mining sand

Chan, Chee-Ming (2017) Influence of deposition density on undrained shear strength parameters of mining sand. AIP Conference Proceedings, 1891 (020034). pp. 1-5. ISSN 15517616

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Abstract

Sand is widely used as the underlying soil for the construction of road embankments. The deposition density of sand is therefore of crucial importance to ensure long term stability of the overlying materials. The present study examined the effect of variation in density on the undrained shear strength parameters of a mining sand sample. The standard direct shear test apparatus was adopted for the measurements. The sand sample was prepared in loose (1400 kg/m3), medium dense (1600 kg/m3) and dense (1940 kg/m3) forms via the dry pulverization method. For the direct shear test, 3 vertical loads were applied to obtain the shear stress – displacement plots, i.e. σv = 25, 50 and 100 kPa. The results indicated significant influence of deposition density of the sand on the shear strength measurements, where higher density gave higher shear strength readings with greater frictional resistance mobilised. Besides, the peak shear strength recorded at failure (τf) for all samples were almost 4 times of those observed post-failure, i.e. residual shear strength, τF. the corresponding failure and residual shear strains, γf and γF respectively, showed marginal changes at σv = 25 kPa. Initial loose packing of the sand was also found to be detrimental post-failure with marginal residual shear strength locked in. All in all the findings point towards the importance of accurately identifying initial packing density of the sand to estimate the inherent shear resistance for load-bearing.

Item Type: Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA703-711 Engineering geology. Rock mechanics. Soil mechanics.
Divisions: Faculty of Engineering Technology > Department of Civil Engineering Technology
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 30 Apr 2019 01:08
Last Modified: 30 Apr 2019 01:08
URI: http://eprints.uthm.edu.my/id/eprint/11044
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