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《Journal of Experimental Mechanics》 2010-03
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Experiment Study of Rock Damage Deformation Characteristics Based on Plastic Volumetric Strain Analysis

GUO Zi-hong1,2, LIU Xin-rong1, LIU Bao-xian2, SHU Zhi-le1, FU Yan1 (1.Civil Engineering College, Chongqing University, Chongqing 400045, China; 2. School of Architectural and Civil Engineering, Xihua University, Chengdu 610039, China)  
In order to analyze the relationship between rock plastic deformation and damage, rock initial damage and critical damage were defined, and plastic volumetric strain analysis method was put forward, then rock damage constructive model was set up based on normalization and plastic volumetric strain by way of damage variable. Uniaxial incremental circulating compression experiment was carried out to determine two parameters: elastic unloading modulus and elastic strain proportional coefficient. Experimental results and theory analysis show that first, when load is small and increasing, rock’s damage is decreasing in general uniaxial compression condition; when load surpasses a certain number, rock’s damage begins increasing; second, when cyclic load is higher than 35% peak strength, rock’s damage presents increasing trend after unload; when the cyclic load is lower than 35% peak strength, rock’s damage decreases after unload. Theoretical stress-strain curve accords with experimental results well in loading condition and theoretical curve can embody hysteretic loop of experiment results in cyclic loading region.
【Fund】: 国家自然科学基金创新群体基金(50621403)
【CateGory Index】: TU452
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