Study on the Dynamic Mechanical Characteristics and Failure Mechanism of Hard Roof in Dynamic Pressure Roadways Under Impact Load
To study the dynamic mechanical characteristics and failure mechanism of hard roof in dynamic pressure roadways under the influence of impact load,a combination of SHPB impact test and numerical simulation is used to analyze the dynamic mechanical characteristics and failure modes of roof with different lithology.The failure mechanism is revealed from the perspective of stress waves.The results show that the dynamic mechanical characteristics of the sample have a relatively strong strain rate effect,and the dynamic compressive strength increases linearly with strain rate;As the impact load increases,the dynamic compressive strength,dynamic elastic modulus,and ultimate strain of the sample all increase within a certain range,and the failure mode shows a trend of changing from tensile failure to shear failure;The main reason for the expansion and penetration failure of internal cracks is the superposition of tensile waves formed by the reflection of stress waves inside the sample along the axle centre.
万方数据
维普
