Energy release rate due to friction at bimaterial interface in dams

Sujatha, V and ChandraKishen, JM (2003) Energy release rate due to friction at bimaterial interface in dams. In: Journal of Engineering Mechnics-ASCE, 129 (7). pp. 793-800.

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Abstract

The interface between concrete dam and rock foundation is one of the most important regions governing the strength and stability of gravity dams. Many researchers have attempted to extend the fracture mechanics approach to study this rock concrete interface assuming stress free crack surfaces. In a real-life situation, because of the combined compression and shear loading, the crack faces come in contact resulting in a sizeable contact zone near the crack tip. Thus, frictional contact of the crack surfaces cannot be neglected. The frictional contact alters the stress singularity to become either weaker or stronger than the inverse square root singularity observed in homogeneous crack problems. Consequently, the strain-energy release rate as conventionally defined, either vanishes or becomes unbounded and thus cannot be used as a fracture parameter. In this work, an attempt is made to include the effect of friction associated with the sliding of crack surfaces and compute the energy dissipated during crack propagation. It is shown that the total energy release rate decreases with crack length when friction is accounted for between the rock-concrete interface in gravity dams.

Item Type:	Journal Article
Publication:	Journal of Engineering Mechnics-ASCE
Publisher:	American Society of Civil Engineers
Additional Information:	Copyright of this article belongs to American Society of Civil Engineers.
Keywords:	cracking;dams;gravity;friction;interfaces;dams;concrete;dam foundations.
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	15 Jul 2009 09:31
Last Modified:	19 Sep 2010 04:54
URI:	http://eprints.iisc.ac.in/id/eprint/16876

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