Effect of acid corrosion on dynamic tensile strength and energy dissipation of coal
Underground coal mines are often disturbed by acidic water corrosion and dynamic loads such as mining and blasting,in order to study dynamic mechanical behavior of coal after acid corrosion,the split Hopkinson bar(SHPB)system was used for dynamic tensile tests of coal before and after treatment of acid solutions(pH= 2,4).Based on the X-ray diffraction test results,the correlation between the damage mechanism of acidic on coal and mechanical properties was explored.The results show that the dynamic tensile strength of coal displays an apparent rate dependency,but the rate dependency is weakened by acidic corrosion.The stronger the acidic is,the more significant the weakening effect is.At the same loading rate,the tensile strength of different coal samples rank as:raw coal>pH=4>pH=2.After acid corrosion,the dissipated energy and the growth rate of dissipated energy decrease obviously.XRD test shows that,the damage mechanisms in acid to coal is manifested in its removal of inorganic minerals and small molecule organic matter in coal,which leads to a decrease in the mechanical properties of coal.
coal mass damageacid corrosiondynamic characteristicloading ratedynamic tensileenergy dissipation
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