Research On The Next Acoustic Signal Characteristics Of Rock Materials With Different Particle Sizes Under Tension And Compression

The rock material particle size and the size of rock destruction load are two important factors which can not be ignored in the process of rock tests and engineering applications,in order to study the effect of particle size and loading of rock like materials of infrasound signal characteristics.Analyzed the infrasound signal characteristics which was catched from the two dimensions which consist of four kinds of particle size(cylinder and cuboid)under uniaxial compression test and three point bending test.At the same time the infrasound signal characteristics of different size and different loading methods are analyzed from the two aspects,get the following conclusion.1.mechanical characteristics(1)The deformation characteristics of varying characteristics of rock-like specimen under uniaxial loading materials are similar to rock material,it can be divided into initial compaction,elastic deformation,plastic deformation,deformation and failure of the four stage;The uniaxial compressive strength of the specimens with particle sizes of 0.315-0.63mm is the largest,and the uniaxial compressive strength of the other three particle sizes decreases with increasing particle size.(2)The load-time curve under three-point bending can be roughly divided into non-linear phase and approximate linear phase by means of fitting;the peak load of samples with different particle sizes decreases with increasing particle size.2.Infrasound signal characteristics(1)Different size(same loading way)(a)Uniaxial loading:The characteristics of the infrasonic signal of the small particle size sample are more disorderly than the overall distribution,and the overall distribution of the infrasound signal waveform characteristics of the large particle size sample is more orderly;The smaller the particle size,the smaller the change of the slope of the cumulative ringing curve is,the smaller the granularity is.The larger the path,the larger the change in the slope of the accumulated ring count curve;The smaller the particle size,the more messy the distribution of the infrasonic signal energy rate,and the larger the particle size,the more orderly the distribution of the infrasonic signal energy rate;When the stress percentage is 0.35-In the range of 0.45 and 0.88-0.97,the energy fractal dimension values of all particle size specimens showed significant decline points,and the fractal dimension of the elastic stage decline point was generally smaller than the fractal dimension of the plastic stage decline point.(b)During the three-point bending loading process:Infrasound signal waveform,cumulative ring count,and energy rate have no obvious regularity with particle size change;with the increase of particle size,the percentage of load corresponding to the minimum value of energy fractal dimension decreases.(2)Different loading methods(same size)(a)The overall amplitude of the next acoustic signal of the uniaxial loading is higher than the overall amplitude of the next acoustic signal of the three-point bending.(b)The infrasound signal of material which under uniaxial loading has a higher overall level of energy than that which under three-point bending.