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Materials 2017, 10(8), 865; https://doi.org/10.3390/ma10080865

On Critical States, Rupture States and Interlocking Strength of Granular Materials

302-100 Quebec Avenue, Toronto, ON M6P4B8, Canada
Received: 30 June 2017 / Revised: 19 July 2017 / Accepted: 21 July 2017 / Published: 27 July 2017
(This article belongs to the Special Issue Granular Materials)
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Abstract

The Mohr-Coulomb theory of strength identifies cohesion and internal friction as the two principal contributions to the shear strength of a granular material. The contribution of cohesion in over-compacted granular materials has been challenged and replacing cohesion with interlocking has been proposed. A theory of rupture strength that includes interlocking is derived herein. The physics-chemistry concept of critical state is elaborated to accommodate granular materials, based on empirical definitions established in the fields of soil mechanics and bulk solids’ flow. A surface in state space, called the critical compaction surface, separates over-compacted states from lightly compacted states. The intersection of this surface with the Mohr-Coulomb envelope forms the critical state surface for a granular material. The rupture strength of an over-compacted granular material is expressed as the sum of cohesion, internal friction and interlocking strength. Interlocking strength is the shear strength contribution due to over-compaction and vanishes at critical state. The theory allows migrations from one critical state to another. Changes in specific volume during such migrations are related to changes in mean-normal effective stress and uncoupled from changes in shearing strain. The theory is reviewed with respect to two established research programs and underlying assumptions are identified. View Full-Text
Keywords: internal friction; cohesion; soil mechanics; bulk solids’ flow; over-compaction; interlocking; jammed state; rupture; slip internal friction; cohesion; soil mechanics; bulk solids’ flow; over-compaction; interlocking; jammed state; rupture; slip
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Szalwinski, C.M. On Critical States, Rupture States and Interlocking Strength of Granular Materials. Materials 2017, 10, 865.

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