Experimental Studies on the Mechanics of Cohesive Frictional Granular Media

Kandasami, RK and Murthy, TG (2013) Experimental Studies on the Mechanics of Cohesive Frictional Granular Media. In: 7th International Conference on Micromechanics of Granular Media , JUL 08-12, 2013 , Sydney, AUSTRALIA, pp. 987-990.

PDF pow_gra_1542_987_2013.pdf - Published Version Restricted to Registered users only Download (994kB) | Request a copy

Abstract

The mechanical behaviour of cohesive-frictional granular materials is a combination of the strength pervading as intergranular friction (represented as an angle of internal friction - Phi), and the cohesion (C) between these particles. Most behavioral or constitutive models of this class of granular materials comprise of a cohesion and frictional component with no regard to the length scale i.e. from the micro structural models through the continuum models. An experimental study has been made on a model granular material, viz. angular sand with different weights of binding agents (varying degrees of cohesion) at multiple length scales to physically map this phenomenon. Cylindrical specimen of various diameters - 10, 20, 38, 100, 150 mm (and with an aspect ratio of 2) are reconstituted with 2, 4 and 8% by weight of a binding agent. The magnitude of this cohesion is analyzed using uniaxial compression tests and it is assumed to correspond to the peak in the normalized stress-strain plot. Increase in the cohesive strength of the material is seen with increasing size of the specimen. A possibility of ``entanglement'' occurring in larger specimens is proposed as a possible reason for deviation from a continuum framework.

Item Type:	Conference Proceedings
Series.:	AIP Conference Proceedings
Publisher:	AMER INST PHYSICS
Additional Information:	Copyright for this article belongs to AMER INST PHYSICS, USA.
Keywords:	Cohesion; peak strength; scaling; UC test; C-Phi materials
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	10 Sep 2013 05:51
Last Modified:	10 Sep 2013 05:51
URI:	http://eprints.iisc.ac.in/id/eprint/47093

Actions (login required)

View Item