Study On Impact Kinetic Energy Change Law And Impact Tendency Of Rocks With Holes And Anchors

The impact tendency of coal rock masses is one of the main influencing factors on the safe and efficient production of mines,and the evaluation of impact tendency is the main basis for judging the strength of the impact tendency.In this paper,through laboratory tests on rock specimens containing holes and anchors,the effects of drilling and anchoring on the impact tendency of the specimens are obtained,and the impact kinetic energy is obtained from the impact kinetic energy of the broken blocks during the statistical test Based on the impact propensity discrimination method,combined with 3DEC numerical simulation analysis of the impact kinetic energy impact law of the specimen with holes and anchors,the main results are as follows:1)The uniaxial compression test,pseudo-triaxial test,and uniaxial loading and unloading tests were used to determine the mechanical parameters of the rock-like specimens in the cuboid shape and the cylindrical shape,and the peak elasticity of the two types of specimens was obtained.Energy ratio coefficient.Through laboratory tests,the strength of the test piece with holes weakens the strength of the test piece,and the larger the hole size,the greater the weakening effect.Increasing the strength of the test piece also changed positively.2)Based on the parameters obtained in the laboratory test,the impact propensity of the drilled specimen and the anchored specimen is evaluated,and the common index evaluation results of each specimen are obtained,which are compared with the actual dynamic phenomena in the laboratory to obtain the There are actually differences.Based on the impact kinetic energy of the broken body during the test,an impact tendency discrimination method based on the impact kinetic energy is obtained,and each test piece is evaluated,and the evaluation results of the differences in common indicators are corrected.3)Perform 3DEC numerical simulation experiments.Compared with the preset borehole layout method in the laboratory,the strength and kinetic energy change rules of pressure-relieving test pieces for different stress levels were studied.The analysis of the impact kinetic energy of the specimen is analyzed to obtain the impact regularity of the impact kinetic energy with the size of the pallet,and the obtained impact tendency discrimination index based on the impact kinetic energy is corrected.