岩石变形破坏过程中的能量耗散分析

ENERGY DISSIPATION OF ROCK DEFORMATION AND FRACTURE

岩石作为一种复杂的非均质地质材料,其力学响应表现出明显的非线性和各向异性特点。岩石在变形破坏过程中始终不断地与外界交换着物质和能量,是一个能量耗散的损伤演化过程。采用损伤演化方程可以从宏观上描述损伤变量以及与其相伴的广义热力学力——损伤能量释放率的变化规律。进一步通过细观损伤力学的研究,可以揭示岩石变形破坏过程中能量耗散的内在机制。围绕这一基于能量耗散的岩石力学研究思路及其相关进展,最终将建立基于损伤演化及能量耗散的宏-细-微观多层次耦合的岩石力学体系,这有助于更准确地解决岩石工程领域中更多的力学分析问题。

As a kind of inhomogeneous and complex geological material, rocks are of distinctly nonlinear and anisotropic mechanical behavior. The deformation and fracture of rocks are an evolution process with exchange of energy and mass between rocks and outer exotic environment. The variation rule of the damage variable and the coupled variable, damage energy dissipation rate, can be described on macro aspect by the damage evolution equation. Furthermore, the intrinsic mechanism of energy dissipation during the deformation and fracture of rocks can be disclosed by the research of meso damage mechanics. Some progress is reviewed related to energy dissipation in the field of rock mechanics, and a macro-meso-micro system based on damage evolution and energy dissipation is suggested, which contributes to solve more engineering problems exactly.