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Keywords: comminution
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Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0470
... ABSTRACT: During the confined comminution of granular materials, the work input is transformed into elastic energy stored in the grains, breakage energy used to generate new surfaces, energy dissipated by friction between grains in contact, and redistribution energy dissipated by the relative...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-270
... Abstract: During comminution, several energy dissipation processes operate simultaneously, including plastic work due to internal friction, fracture energy release due to particle breakage, and plastic work due to the rearrangement of fragments. Recent studies show that the plastic work due...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-231
... characterization hypothesis upstream oil & gas grain size constitutive coupling simulation saturation granular soil hydraulic fracturing géotechnique hydro-mechanical coupling particle suction comminution evolution relation hydraulic state unsaturated granular media buscarnera 1...
Proceedings Papers

Paper presented at the The 33rd U.S. Symposium on Rock Mechanics (USRMS), June 3–5, 1992
Paper Number: ARMA-92-0141
... to it. The fractures within the gouge, as sites of extreme grain comminution, may bound domains of differing but elevated pore pressures which in turn may reduce the frictional strength and rotate the stress field. Chemically-induced reductions of frictional strength as documented in experiments are found...
Proceedings Papers

Paper presented at the The 25th U.S. Symposium on Rock Mechanics (USRMS), June 25–27, 1984
Paper Number: ARMA-84-0979
... of application of a plane wave pulse. At high pulse durations, degree of fragmentation is more sensitive to changes in pressure than at low pulse durations. INTRODUCTION Recent interests in improving the efficiency in the comminution of ore minerals have led to studies involving the characterization...
Proceedings Papers

Paper presented at the The 24th U.S. Symposium on Rock Mechanics (USRMS), June 20–23, 1983
Paper Number: ARMA-83-0181
... reduction. Figure 1. Effect of blasting on costs of mining unit operations (After MacKenzie)(available in full paper) Figure 2. Total cost effect of improved fragmentation. (After MacKenzie)(available in full paper) comminution Efficiency initiation hole diameter sand-cement mortar material...
Proceedings Papers

Paper presented at the The 21st U.S. Symposium on Rock Mechanics (USRMS), May 27–30, 1980
Paper Number: ARMA-80-0410
... INTRODUCTION ABSTRACT Slow compression tests were conducted on cores of variable height-to-diameter ratios. Size distributions of the comminutes are used to assess the kinetics of comminution. These tests have the advantage of being simple to execute. Also, comminution in these tests...
Proceedings Papers

Paper presented at the The 3rd U.S. Symposium on Rock Mechanics (USRMS), April 20–22, 1959
Paper Number: ARMA-59-0060
... and blasting operations in mines. INTRODUCTION The idea of this paper was suggested by the distinguished alumnus of the Colorado School of Mines, Fred C. Bond, who has devoted a lifetime to the basic study of comminution and who gave us "The Third Theory of Comminution" (1952). The appearance...
Proceedings Papers

Paper presented at the The 3rd U.S. Symposium on Rock Mechanics (USRMS), April 20–22, 1959
Paper Number: ARMA-59-0076
... into the geometrical problem of tracing the peregrinations of these disturbances through the rock specimen of interest, particularly with respect to mutual interactions of incident and reflected stress waves. Completion of a number of exercises of this type suggest that comminution may to a large measure be controlled...
Proceedings Papers

Paper presented at the The 3rd U.S. Symposium on Rock Mechanics (USRMS), April 20–22, 1959
Paper Number: ARMA-59-0082
... & mining work index value Colorado School crack length mining metall Arizona size analysis Christmas ore comminution work index curvature blast 2 Engineer blast product size 80 kilowatt hour underground failure dynamite THE WORK INDEX IN BLASTING By F tED C. BOND and B tccz B...
Proceedings Papers

Paper presented at the The 3rd U.S. Symposium on Rock Mechanics (USRMS), April 20–22, 1959
Paper Number: ARMA-59-0032
... envelope is valid. Increase of compressive strength due to confining pressure is many times higher than the one due to increased stress rate. EFFECT OF STRESS RATE At the outset of this first session on "Factors Common to Comminution, Underground Failures, and Failures Resulting from Explosions" it might...
Proceedings Papers

Paper presented at the The 3rd U.S. Symposium on Rock Mechanics (USRMS), April 20–22, 1959
Paper Number: ARMA-59-0042
... hydraulic fracturing comminution deformation surface energy Magnitude work input plastic deformation energy requirement STUDIES OF THE ENERGY REQUIREMENTS FOR CRUSHING By RicHam) A. ZELENY and EA t L. PmZT *Department of Chemical Engineering, Michigan State University. **Professor of Chemical...

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