%0 Journal Article
%A CHANG Yu-lin
%A WEN Sen
%A ZHANG Jian-wei
%T Numerical Simulation on Dynamic Mechanical Properties of Mixed Rock Strata Based on Split Hopkinson Pressure Bar Test
%D 2019
%R 10.11988/ckyyb.20171484
%J Journal of Yangtze River Scientific Research Institute
%P 106-111
%V 36
%N 7
%X As the dynamic destruction of mixed rock strata are increasingly observed in engineering, it is indispensible to study the mechanism of dynamic destruction. A numerical model of split Hopkinson pressure bar (SHPB) was established by PFC<sup>2D</sup> to simulate the dynamic failure process of mixed rock strata specimens with different dip angles of rock strata at varied strain rates. The conclusions are drawn from numerical simulation as follows: 1) as the dip angle of mixed rock strata increased, the dynamic compressive strength and dynamic elastic modulus reduced at first and then surged, displaying a “V”-shaped curve; 2) dynamic compressive strength increased correspondingly with the climbing of strain rate, while dynamic elastic modulus is less affected by strain rate; 3) the cracks of mixed rock strata were dominantly tensile cracks, and dynamic fragmentation exacerbated with the increasing of strain rate; 4) the macroscopic failure mode of specimen was affected by the number and coalescence of cracks. The research findings are conducive to understanding the dynamic failure mechanism in mixed rock strata.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20171484