In order to study the effect of strain rate on the dynamic characteristics of phyllite under different length-diameter ratio and dip angle,the samples with four dip angles(α=0°,30°,60° and 90°)and two lengths(L=25,50 mm)were selected as research objects.The dynamic compression tests under different impact pressures(p=0.150,0.175,0.200,0.225 and 0.250 MPa)were carried out by using the split Hopkinson pressure bar(SHPB)system.The dynamic characteristics of phyllite with two aspect ratios at different strain rates were studied,and the influence of the coupling effect between the bedding dip angle,aspect ratio and strain rate on the strength characteristics of phyllite was analyzed.The results show that under dynamic compression,the dynamic compressive strength of phyllite with two different aspect ratios decreases first and then increases with the increase of bedding angle,and the dynamic peak strength and peak strain increase with the increase of strain rate.The relationship between dynamic compressive strength of phyllite and strain rate follows a power function.The relationship between peak strength and bedding angle α and L/D is binary function.When α=60°,the aspect ratio effect on the dynamic compressive strength of phyllite is the most significant,and when L/D=2,the dip angle effect is the most significant.Under different bedding dip angles,the aspect ratio effect of peak strain is the most significant at 0°dip angle,and the weakest at 90°dip angle.The strain rate effect on dynamic compressive strength and peak strain of phyllite under dynamic impact is stronger than that of aspect ratio effect.
rock mechanicslayered phylliteSHPB testdynamic characteristicsmulti-factor coupling
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