Study on bedding effect of bump tendency for hard coal

Coal is a kind of rock that with developed bedding, and its tendency of bump is affected by the beddings.In this paper, based on the experimental data of No.14 coal mass in Xinzhouyao Mine, the bump tendency of coal samples with different bedding angle is analyzed according to the effect of bedding on the mechanism of coal.The results show that the nonlinear elastic characteristics, the deformation modulus, peak strength, the drop characteristics after post-peak strength are all related with beddings, which indicated that the bump tendency is also related with beddings; According to the impact energy index, the bedding angle of 0° shows a strong bump tendency.When the bedding angle is 45°, the bump tendency is weak than that of 0°.When the bedding angle is 90°, the bump tendency is the smallest; According to the dynamic destruction time, the cola bump is much smaller, which is caused by the step drop after peak strength; The reason why the bump tendency is influenced by the bedding angle , is that the failure mode of coal with different beddings is different .The results of this study show that the bedding effect should be taken into account when the bump tendency of coal samples is tested.