真三轴条件下的岩石细观损伤力学模型

本文提出了真三轴条件下的岩石细观损伤力学模型，建立了岩石的损伤演化方程，给出了损伤柔度的求解公式。数值分析表明中主应力对岩石应力－应变关系有明显的影响，一般表现为随中主应力的增加，最大主应力方向的变形减小，最小主应力方向的变形增大；但当最大主应力很大时，大的中主应力反而使最大主应力方向的变形增加，最小主应力方向的变形减小。

A Micromechanical Damage Model for Rocks Subjected to True Triaxial Stresses

A microscopic model is proposed for the mechanical damage of rocks subjected to true triaxial stresses toanalyze the influence of intermdiate principal stress on the constitutive relatioriship of rocks. Both the kinetic equa-tions of damage evolution and the formulations of damage compliance are developed. The numerical results indicatethat the intermediate principal stress has a strong influence on the mechanical properties of rocks It is shown that asthe intermediate principal stress increases the strain decreases in the direction of maximum principal stress directionand increases in the direction of minimum principal stress direction respectively But, when the maximum principalstress is large, large intermediate principal stress makes rock deform difficultly in the direction of maximum principalstress and easily in the dirertion of minimum principal stress