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Research Devlopment of Rock Damage Theory Characterized by Damage Variables

LIU Hong-yan~1, WANG Gen-wang~2, CHEN Fu-gang~3 (1.School of Mechatronic Engineering, Beijng Institute of Technology, Beijing 100081, China; 2.Machinery Engineering Company, Henan Coal Construction Group Limited Company, Zhengzhou 450009, China; 3.The Second Compang, The Second Bureau of China Construction 471001, China)  
Starting with the definition of the damage variables, the definition methods of damage variables and their related damage models are discussed. Through the discussion of the definition methods of damage variables from the method of simple phenomena to the method of considering microphone of crack, the development trend of the rock blasting damage theory is summarized.
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