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用重正化群方法研究发现 :岩石内部微元累进破坏过程中存在一个可用微元临界破坏概率来表征的自组织临界状态 ;在该临界状态以前 ,微元的破裂是随机、独立和短程相关的 ,岩石蠕变为稳定蠕变 ;在该临界状态以后 ,微元的破裂便是相互协同和长程相关的 ,并且原来随机、无序分布的破裂微元会逐渐向某一吸引域集中而形成宏观贯通的破裂面 ,岩石蠕变为不稳定蠕变 ;与该临界破坏概率相对应的应力值是岩石的长期强度 ,它约为岩石峰值强度的 80 %。
Using the renormalization group method, it is found that there exists a self-organized critical state which can be characterized by the critical damage probability of micro-elements during progressive failure of micro-elements in the rock. Prior to the critical state, the rupture of micro-elements is random, independent and short-range correlation , And the rock creep is stable creep. After the critical state, the rupture of the microelements is mutually synergistic and long-range related, and the original ruptured microelements randomly and disorderedly distributed gradually form a certain attracting domain The macroscopic rupture surface and rock creep are instable creep. The stress value corresponding to the critical failure probability is the long-term strength of the rock, which is about 80% of the rock peak strength.