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Title: Liquefaction of sand-tyre chip mixtures
Author: Promputthangkoon, Panu
ISNI:       0000 0004 2690 0859
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2010
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This research attempts to address the two problems of soil liquefaction in reclaimed land and a growing number of discarded tyres by mixing liquefiable sand with tyre chips and using them as fill materials with the aim reducing the liquefaction potential. The cyclic strength of sand-tyre chip mixtures was investigated using a cyclic triaxial system which was modified to house bender elements for measuring the shear wave velocity and small strain shear modulus. In addition, the behaviour of the mixtures under monotonic loading conditions was studied using a standard triaxial apparatus with pore water pressure measurements The triaxial test results showed that the addition of rubber alters the stress-strain, pore water pressure, and stress path behaviours, depending on the amount of rubber added. It was found that the cyclic strength of mixtures with 5% to 30% rubber content were lower than that of pure sand. However, when the rubber was increased to 40% and above, the cyclic strength was increasingly improved. The bender element tests showed that the higher the percentage of rubber, the lower was the shear wave velocity and shear modulus. The seismic response of the layered soils comprising sand, clay, and sand-tyre chips has been analysed using equivalent linear elastic analysis. This showed that the sand-rubber mixtures actually amplify the ground accelerations and generate higher shear strains, compared to pure sand; however, the generated shear stress did not vary with the addition of rubber. Nevertheless, it was found that the mixtures improve the overall factor of safety against liquefaction, suggesting that they may be used to mitigate the hazard.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available