Summary
Rock Dilatancy in Uniaxial Tests
A procedure to find an elastic/viscoplastic constitutive equation able to describe rock dilatancy in uniaxial unconfined creep tests is given starting from experimental data. The influence of the loading rate on the rock dilatancy can also be described with this model. It is shown that a creep of the volume takes place during tests and that this volume creep has the following property: the volume strain is oscillating before ariving at its final stable value. This property is described by the proposed mathematical model using a variable viscosity coefficient which may change sign. According to the model the volume creep takes place during loading only.
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References
Bordia, S. K.: Complete Stress-volumetric Strain Equation for Brittle Rock up to Strength Failure. Int. J. Rock Mech. Min. Sci.9 17–24 (1972).
Brace, W. F.: Volume Changes During Fracture and Frictional Sliding: A Review. Pageoph.116 603–614 (1978).
Brace, W. F., Paulding, Jr., B. W., Scholz, C.: Dilatancy in the Fracture of Crystalline Rocks. J. of Geophys. Res.71 16, 3939–3953 (1966).
Constantinescu, M.: Experimental Formulation of Constitutive Equations for Solid Porous Materials. Ph. D. Thesis, University of Bucharest (In Romanian, unpublished).
Cristescu, N.: A Viscoplastic Constitutive Equation for Rocks. INCREST Preprint in Mathematics, No. 49/1979, Bucharest 1979.
Kranz, R. L., Scholz, C. H.: Critical Dilatant Volume of Rocks at the Onset of Tertiary Creep, J. of Geophys. Res.82 4893–4898 (1977).
Malvern, L. E.: Plastic Wave Propagation in a Bar of Material Exhibiting a Strain Rate Effect. Qu. Appl. Math. VIII, 4, 405–411 (1951).
Massier, D., Cristescu, N.: In Situ Creep of Rocks. Rev. Roum. Sci. Techn. Ser. Mec. Appl.26 5, 687–702 (1981).
Massier, D., Cristescu, N.: Creep of Rocks Around Horizontal Tunnels (to be published 1982).
Nicolae, M.: Rheological Properties of Rocks. Master Thesis, University of Bucharest 1981 (in Romanian, unpublished).
Perkins, R. D., Green, S. J., Friedman, M.: Uniaxial Stress Behaviour of Porphyritic Tonalite at Strain Rate to 103 Second. Int. J. Rock Mech. Min. Sci.7 527–535 (1970).
Walsh, J. B.: The Effect of Cracks on the Compressibility of Rock. J. of Geophys. Res.70 2, 381–389 (1965).
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Cristescu, N. Rock dilatancy in uniaxial tests. Rock Mechanics 15, 133–144 (1982). https://doi.org/10.1007/BF01238260
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DOI: https://doi.org/10.1007/BF01238260