Experimental assessment of stiffness and damping in rubber-sand mixtures at various strain levels

Bernal-Sanchez, J; McDougall, J; Barreto, D; Marinelli, A; Dimitriadi, V; Anbazhagan, P; Miranda, M

Abstract

The dynamic properties of shredded rubber-soil mixtures (ShRm), comprising a sub-rounded quartz sand combined with small rubber shreds at 0, 10, 20, 30% by mass, were investigated. Testing ranged from small strain, in resonant column apparatus, to large strain, in cyclic triaxial, all at a frequency of 1 Hz with mean stress equal to 100 kPa. As observed by other workers, the shear stiffness of rubber soil mixtures decreases both (i) with rubber content and (ii) with shear strain. In contrast, increases in damping ratio are smallest at higher rubber contents. Shear modulus reduction behaviour for ShRm are shown to fit well for all percentage rubber contents, the functional form put forward by Darendeli (2001). Damping ratio was well-fitted by Darendeli up to a shear strain of about 0.2%, after which the variable trend shown by ShRm has been adjusted using the expression proposed by Phillips & Hashash (2009).

Citation

Bernal-Sanchez, J., McDougall, J., Barreto, D., Marinelli, A., Dimitriadi, V., Anbazhagan, P., & Miranda, M. (2019, June). Experimental assessment of stiffness and damping in rubber-sand mixtures at various strain levels. Presented at 7th International Conference on Geotechnical Earthquake Engineering, Rome

• Presentation Conference Type: Conference Paper (published)
• Conference Name: 7th International Conference on Geotechnical Earthquake Engineering
• Start Date: Jun 17, 2019
• End Date: Jun 20, 2019
• Acceptance Date: Mar 3, 2019
• Publication Date: Jul 19, 2019
• Deposit Date: Jul 26, 2019
• Volume: 4
• Pages: 1403-1410
• Series Title: Proceedings in Earth and Geosciences
• Book Title: Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions
• ISBN: 978-0-367-14328-2
• Public URL: http://researchrepository.napier.ac.uk/Output/1906112