The Mechanical Properties of Rocks under High Pressure

Abstract

§1. Introduction. - General view of rock deformation under high pressure. §2. Stress system. - Methods of compression and extension test under hydrostatic pressure. §3. Elastic modulus. - Variation of mean Young’s modulus with increasing pressure. Change of figure of curves of mean Poisson’s ratio-deforming stress relation with increasing pressure. Variation of elastic wave velosities associated with the change of elastic modulus under the large deformation. §4. Ductility. - Classification of rocks. Ductile property of carbonate rocks at high pressure. Non-ductile behavior of igneous rocks at high pressure. Effect of temperture on the ductility of carbonate rocks at high confining pressure. §5. Strength. - Variation of yield strength of carbonate rocks with congning pressure. Variation of crushing strength of igneous rocks with confining pressure. Empirical relation of strength-pressure of granite. Effect of temperature on the strength of carbonate rocks at high pressure. §6. Creep. - Relation between stress and creep rate. Estimation of creep limit of rocks under high pressure. §7. Experiments at high pressure and high temperature. - Stress-strain relation of carbonate and silicate rocks at 5k.b. and up to 800℃.