Uniaxial compressive strength testing and impact tendency analysis of coal under different loading rates
In view of the variation and dispersion of uniaxial compressive strength data of coal sample from impact tendency test with loading rate,taking No.3 Coal Seam of Changcheng No.6 Coal Mine in Etuokeqian Banner,Inner Mongolia as the research background,the grouping test of coal sample standard parts was conducted by setting three different loading rates of 0.50 MPa/s,0.75 MPa/s and 1.00 MPa/s.The test results showded that the uniaxial compressive strength test values of coal obtained from three different loading rates had discreteness.There was no significant linear relationship between loading rate and uniaxial compressive strength test values.After discarding the maximum and minimum values with greater dispersion in each group,the average and standard deviation of the uni-axial compressive strength of coal under different loading rates were calculated again to obtain test values with relatively less discrete-ness;there was no significant proportional relationship between the uniaxial compressive strength test values of coal samples and the loading rate,and changes in loading rate could lead to changes in the impact tendency level of the same coal seam.
rock burstloading rateimpact tendencyuniaxial compressive strengthdispersion
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NSTL
万方数据
