【摘要】 复合岩层的动态破坏问题在工程中越来越多,因此研究其动态破坏机理很有必要。采用PFC^2D软件建立分离式霍普金森压杆（SHPB）数值模型,模拟了复合岩层试样在不同倾角及不同应变率下的动态破坏过程。研究表明:随岩层倾角的增大,复合岩层试样动态抗压强度、动态弹性模量曲线整体呈先减小后增大的近"V"字型变化;动态抗压强度随着应变率的增加而增大,而动态弹性模量受应变率的影响较小;复合岩样裂纹以拉伸为主,随着应变率的增大,试样的动态破坏破碎程度越来越严重;试样的宏观破坏模式受细观裂纹的数量及贯通情况综合影响。研究结果有助于理解复合岩层动态破坏规律。更多还原

【Abstract】 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^{2 D} 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.更多还原