To investigate the influence of bedding planes on its fracture characteristics under dynamic loading, testing and numerical simulations are carried out on semi-circular bend specimens of coal. It is shown that the fracture load and dynamic initiation fracture toughness decrease as the increase of bedding-plane angle. The crack propagation direction is jointly controlled by the maximum principal stress and bedding planes. Based on the digital speckle correlation method, it is found out that, due to stress concentration, strain at the initial loading stage concentrates around crack tip. After crack initiation, there is a specific strain gradient with a candle flame-like shape on the surface of a specimen. The opening displacements at crack tip can be divided into stable and linearly increasing phases. Further, a continuum-based discrete element method is applied to virtually reproduce these fracture characteristics, which are instructive to study dynamic anisotropy in fracture of coal.

为了研究层理面对动载荷作用下其断裂特性的影响，对煤的半圆形弯曲试样进行了试验和数值模拟。结果表明，随着层理面角的增加，断裂载荷和动态起始断裂韧性均降低。裂纹的扩展方向由最大主应力平面和层理平面共同控制。基于数字散斑相关方法，发现由于应力集中，初始加载阶段的应变集中在裂纹尖端附近。裂纹萌生后，试样表面出现特定的应变梯度，呈烛光状。裂纹尖端处的开口位移可分为稳定阶段和线性增加阶段。更多，