基于损伤能量耗散的岩体块度分布预测王利.pdf

26 6 Vol.26 No.6 2007 6 Chinese Journal of Rock Mechanics and Engineering June 2007 1 2 (1. 454000 2. 100083) TU 45 A 1000 6915(2007)06 1202 10 FRAGMENTATION DISTRIBUTION PREDICTION OF ROCK BASED ON DAMAGE ENERGY DISSIPATION 1 2 WANG Li GAO Qian (1. College of Civil EngineeringHenan Polytechnic University Jiaozuo Henan454000 China 2. Department of Civil Engineering University of Science and Technology BeijingBeijing100083China) Abstract A set of prediction method of rock fragmentation is presented. Generally there are three kinds of methods to predict fragmentation. The first is to predict the fractal number of fragmentation by relating it with fractal dimension number of crack in the rock. The second belongs to geometric method that directly computes the size of fragmentation by searching the possible crossed cracks. The third is by using energy dissipation during rock fracturingupon which this paper is focused. In fact fragmentation is a brittle fracture event which can be studied within the frame of damage mechanics. With the increment of compression fractal distributed cracks cut the intact rock into fragmented bodies and eventually results in a fractal distributed fragmentation system. According to the principle of conversation of energy a theoretical formula is establishedwhich represents the relationship among fragmentation sizefractal dimension number of fragmentation systemand damage variable. In order to use the formula in engineer