关键词:  , 细观力学, 热力学, 均匀化, 大理岩, 损伤

Abstract: Through observing the strain response and the surface crack image of marble samples, researches on surface micro crack initiation of samples, the image expansion and the corresponding experimental quantitative were made. Based on the fundamental theories of micromechanics and thermodynamics, and with the help of fundamental method of homogeneous, the damage evolution properties of marble under uniaxial compression were mainly investigated. The elasticity assumptions were put forward, and rock host and crack was recognized as the composition of rocks, both of which conform to the principle of superposition. The cracks were divided into open crack and close crack and were analyzed form the perspective of micromechanics and thermodynamics. On the hypothesis that the crack was under tensioning force at initial time, shearing pressure become the main force to the rock damage when crack closed. The rule of crack evolution properties was determined, and the relationship between crack normal motion and tangential motion was represented with application of non-elasticity Mohr-Coulomb criterion under shearing pressure. Lastly the characteristics of the damage dynamic evolution were discussed further under uniaxial compression.

Key words:  , Micromechanics, Thermodynamics, Homogeneous, Marble, Damage