Damage and failure rule of rock undergoing uniaxial compressive load and dynamic load

来源期刊：中南大学学报(英文版)2005年第6期

论文作者：左宇军 李夕兵 周子龙 马春德 张义平 王卫华

文章页码：742 - 748

Key words：uniaxial static compressive load; dynamic load; damage; constitutive model; energy

Abstract: For understanding the damage and failure rule of rock under different uniaxial compressive loads and dynamic loads, tests on red sandstone were carried out on Instron 1342 electro-servo controlled testing system with different uniaxial compressive loads of 0, 2, 4 and 6 MPa. It is found that peak stress, peak strain, elastic modulus and total strain energy decrease with the increase of static compressive stress. Based on the test results, the mechanism on damage and failure of rock was analyzed, and according to the equivalent strain hypothesis, a new constitutive model of elastic-plastic damage was established, and then the calculated results with the established model were compared with test results to show a good agreement. Furthermore the rule of releasing ratio of damage strain energy was discussed.