Research And Us Application On Similar Materials For Mechanical Properties And Energy Dissipation Under Vibration

Based on the latest progress and achievement of solid-gas coupling similar material,physical analog simulation experiment is carried out under the influence of mechanical vibration,and mechanics characteristics and the law of permeability of coal and rock under mechanical vibration are carried out,the energy evolution mechanism of damage process of coal and rock under the environment of evolution is studied,the energy transmission,the 3 aspects of mesoscopic characteristic including energy evolution and energy difference before and after vibration studies the energy representation of similar material in the process of vibration-pressure coupling,which has great significance in providing the theoretical foundation of mining coal and gas safety system.Orthogonal experimental design method and comprehensive evaluation method are applied for the experiment design of ratio of similar materials needed by the vibration experiment,raw materials is chosen through the coMParison analysis of different material properties.Materials of mechanics,fracture mechanics,vibration mechanics and thermodynamics are applied to build up relational model of the vibration frequency and elastic modulus and compressive strength of similar material,mechanics parameters change rule of similar material under mechanical vibration is studied.Based on independent research and development of vibration experiment system of the coal and rock under uniaxial restraint,the selected five groups of similar material specimen is used to carry out the test experiment about the mechanical properties of different proportion,the density of elastic strain and the dissipation of density,and sum up the effect of mechanical vibration frequency of specimen on mechanical parameters,the density of elastic strain and thee dissipation of density.Through the establishment of relational model of similar material mechanics parameters and vibration frequency,the similar material specimens of the compressive strength and modulus of elasticity under different vibration frequency is calculated,it is coincident with the experimental results.The energy evolution regularity of similar material is almost the same under the loading mode of vibration-pressure and uniaxial,and all experience 3 stages including the energy input,energy accumulation and energy dissipation.The energy evolution law of similar material is studied under unidirectional loading and vibration,and obtain the mechanical characteristic and analyze the development rule of the energy density values and energy difference and the energy difference ratio with the development of vibration frequency.Three parameters of the similar materials including Energy density value,energy difference and energy difference ratios can represent the development rule of mechanical characteristic of similar material under different frequencies.To promote theoretical research results,a simple analysis method is put forward considering similar material mechanical parameters under the influence of mechanical vibration,its rationality has been proved through a lot of experimental data and the model calculation.