深部开采突水机制的细观分析和临界破坏行为

深部开采中高岩溶水压极易造成围岩突水,而突水通道主要是由一系列的小破裂发展演化而成,因为小破裂的积累形成大的破裂,从而演化到突变.本文分别在二维和三维情况下利用重整化群方法分析已破裂单元对未破裂单元的应力转移,计算原胞的临界破坏概率、关联指数和分形维数.同时对岩层突水的临界特性进行研究,由临界破坏特征和裂缝密度与损伤变量的关系,并考虑加载和岩石初始损伤的影响,得到在静态损伤力学网络下的岩石突水破裂损伤演变方程.

Micromechanical analysis and critical failure actions of water-inrush mechanism in deep mining

High karst water burst causes water-inrush easily in deep mining engineering.Water-inrush channel are mainly from a series of small break,and small accumulated breaks form big break,and develope to the mutation.In the case of 6=2 and 6=3(b is the change of correlation dimension),the stress transfer from broken element to unbroken element by renormalization group is analysed,and the critical broken probability,correlation index and fractal dimension are calculated.The critical behaviour of water burst is researched.With the relations of critical broken behaviour,crack density and damage variation,a water burst damage evolution equation under statistical damage mechanics network is suggested by considering the effect of loading rate and initial damage in rock.