Coal And Rock Dynamic Pressure Cut Composite Load Experiment

This paper takes the pan xie sheet sets coal mining area of huai nan city of coal as the research object.Coal and rock dynamic compressive shear composite load experiment study.Combining theoretical analysis and numerical simulation and combined with engineering practice,the method of studying the dynamic mechanical properties of coal.Through the analysis of domestic and foreign research situation of coal and rock,now found on the research of coal and rock dynamic mechanical performance or less,and the regional difference of coal and rock is larger..So the use of dynamic pressure shear system based on hopkinson pressure bar for pan xie sheet sets coal mining area of huainan city experiment of coal rock.For the research of coal and rock dynamic mechanics performance to provide reliability basis.Based on the hopkinson pressure bar are verified through the simulation software of ABAQUS,the feasibility of the dynamic pressure shear system.First of coal and rock under different strain rate of coal and rock dynamic uniaxial compression test.get the experimental waveforms,to deal with the experimental waveforms come to the conclusion:In a certain range of strain rate,with the increase of strain rate,failure stress overall upward trend,failure stress is sensitive to strain rate.In a certain range of strain rate,with the increase of strain rate,failure strain has a tendency to rise,failure strain is sensitive to strain rate.Dynamic pressure on the coal rock cutting experiment,by experiment waveform,analyze the experimental data concluded:Within a certain range of strain rate,with the increase of strain rate,the breaking stress increases,as well as strain rate rises to a certain extent,failure stress began to decline,at the end of the day have no obvious change.Failure stress is sensitive to strain rate has a certain effect.Within a certain range of strain rate,with the increase of strain rate,the dynamic modulus of elasticity as high,when the strain rate increases to a certain into the dynamic modulus of elasticity and reduce,to the original dynamic modulus of elasticity,finally tends to be stable,no obvious change.Dynamic modulus of elasticity is sensitive to strain rate has a certain effect.To comparative analysis:the destruction of the coal and rock strain and loading path has great relevance.Provide the basis for study of the dynamic mechanical properties of coal and rock.By ABAQUS simulation rock-coal-the actual working face,through the comparative analysis of two different under the impact of coal and rock damage,it is concluded that coal and rock in the diagonal direction that under the condition of compression-shear damage is wider,the damage is more serious,the same as the coal and rock dynamic pressure shear experiment results.