Abstract
Experimental-stress-analysis techniques were used to study wave and fracture propagation in rock media. Marble and granite plates were loaded explosively. Wave propagation was observed through isochromatic-fringe patterns on bonded photoelastic coatings and moiré-fringe patterns. These patterns were recorded with a Beckman and Whitley camera operating at rates from 250,000 to 1,000,000 frames per second. Dilatational, shear and Rayleigh wave velocities were determined. The leading part of the pulse is compressive and shows appreciable attenuation. The trailing part goes into tension, causing widespread tensile fracture. The velocity of propagation of this fracture zone in marble was nearly equal to the theoretical terminal velocity. In the case of induced cracks in marble and granite, the velocities of crack propagation were appreciably lower than the theoretical terminal values. Experimental results obtained were discussed and interpreted for their relevance to the rapid-excavation process in rock.
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References
Rapid Excavation, National Academy of Sciences, Washington, D.C., Publication 1690 (1968).
Daniel, I. M. and Rowland, R. E., “Studies of Wave and Fracture Propagation in Rock Media,” IIT Research Institute Report No. D6069, Bureau of Mines-ARPA Contract No. H0220024 (June 1973).
Bieniawski, Z. T., “Fracture Dynamics of Rocks,”Int. J. of Fract. Mech.,4 (4),415–430 (December 1968).
Ricketts, T. E. andGoldsmith, W., “Dynamic Properties of Rocks and Composite Structural Materials,”Int. J. Rock Mech. Min. Science,7 (3),315–335 (1970).
Griffith, A. A., “The Phenomena of Rupture and Flow in Solids,”Phil. Trans. of the Royal Society of London, Series A,221,163–197 (1921).
McClintock, F. A. and Walsh, J. B., “Friction on Griffith Cracks in Rock Under Pressure,” Int. Cong. on Appl. Mech., Berkeley, CA (1962).
Hoek, E., “Rock Fracture Around Mine Excavations,” Proc. 4th Int. Conf. on Strata Control and Rock Mech., Henry Crumb School of Mines, Columbia Univ., New York, NY (May 4–8, 1964).
Irwin, G. R., “Fracture,” Structure Mechanics, ed. by Goodier and Hoff, Pergamon Press, 557–592 (1960).
Yoffe, E. H., “The Moving Griffith Crack”,Phil. Mag.,42,739 (1951).
Roberts, D. K. andWells, A. A., “The Velocity of Brittle Fracture,”Engineering,178,820 (1954).
Baker, B. R., “Dynamic Stresses Created by a Moving Crack,”J. Appl. Mech.,29,449 (1962).
Wells, A. A. andPost, D., “The Dynamic Stress Distribution Surrounding a Running Crack—A Photoelastic Analysis,”Proc., SESA,16,69 (1958).
Schardin, H., Fracture, ed. by Averbach, ea., Wiley, New York, 297–330 (1959).
Hoek, E. andBieniawski, Z. T., “Brittle Fracture Propagation in Rock Under Compresson,”Int. J. Fract. Mech.,1 (3),137–155 (Sept. 1965).
Bieniawski, Z. T., “The Phenomenon of Terminal Velocity in Rock,” Rock Mech. and Eng. Geol. (1968).
Bieniawski, Z. T., “An Application of High-Speed Photography to the Determination of Fracture Volocity in Rock,” Proc. 8th Int. Cong. High-Speed Photography, 440–443 (1968).
Persson, A., “High-Speed Photography of Full-Model Rock Blasting,” Proc. 9th Int. Cong. on High-Speed Photography, Denver (1970).
Field, J. and Ladegaard-Pedersen, A., “The Importance of the Reflected Shock Wave in Rock Blasting,” Swedish Detonic Res. Foundation Report DL 1969:7.
Rowlands, R. E., Daniel, I. M. andPrabhakaran, R., “Wave Motion in Anisotropic Media by Dynamic Photomechanics,”Experimental Mechanics,14 (11),433–439 (Nov. 1974).
Flynn, P. D., “Photoelastic Studies of Dynamic Stresses in High Modulus Materials,” Soc. of Motion Picture and Television Eng., Inc., Reprint No. 99–21, presented at 99th Tech. Conf. (May 1–6, 1966).
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R. E. Rowlands was Senior Research Engineer, Stress Analysis Section, IIT Research Institute; is now Assistant Professor, Engineering Mechanics Department, University of Wisconsin, Madison, zWI, 53706.
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Daniel, I.M., Rowlands, R.E. On wave and fracture propagation in Rock Media. Experimental Mechanics 15, 449–457 (1975). https://doi.org/10.1007/BF02318359
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DOI: https://doi.org/10.1007/BF02318359