节理岩体是工程中最常见的一类岩体，其在地震、爆炸等动载下的力学响应及破坏过程对相关工程安全性的影响至关重要。采用基于有限元应力分析和统计损伤理论开发的动态版RFPA2D数值模拟软件，对动载下节理岩体的动态破坏过程进行了模拟，重点讨论了节理条数、节理贯通度、节理倾角及应力波峰值对岩体动态破坏过程的影响规律。计算结果表明，断续节理岩体动态破坏过程及破坏强度与节理构造形态、应力波峰值密切相关。相同动载下，随着节理条数的增加，岩体破坏程度以及应力波能量损失增强，但当节理条数数超过一定值后，岩体破坏程度及应力波能量损失逐渐趋于稳定；节理贯通度较小时，岩体破坏程度较低且破坏单元自上而下均匀分布。随着节理贯通度的增加，岩体破坏增强，且破坏主要出现于节理上部岩体；节理倾角较小时，节理上部岩体破坏严重，易形成次生贯通裂纹。随着节理倾角增加，破坏范围逐渐变大，不易形成次生贯通裂纹；倾角为45°～60°时，岩体破坏效果最佳；动载荷的峰值越大，试样的破坏越严重。当峰值达到一定值时，节理附近发育出多条裂隙并向上下方不断发展而导致岩体完全破坏。在不同节理贯通度工况下与岩石霍布金森压杆（SHPB）试验结果进行比较，结论吻合，证明该数值模拟的合可行性和结论的可靠性。

The jointed rock mass is the most common kind of rock in the practical engineering, therefore the jointed rock’s mechanical response and failure process under dynamic loading such as earthquake and explosion is crucial to the safety of the relevant engineering. Based on the finite element stress analysis and the microscopic damage mechanics, numerical code RFPA2D is developed to simulate the failure process of intermittent jointed rock mass subjected to dynamic loading. The failure characteristics of intermittent jointed rock mass with different numbers of joints, different joint discontinuity degrees and different joint dip angles under different amplitudes of stress wave are studied respectively. The numerical results show that the failure process and failure extent of intermittent jointed rock mass is closely related to the parameters of joints and amplitudes of stress wave. Under the same dynamic loading, with the increase of the number of joints, fragmentation degree of the rock mass and stress wave energy grows clearly at first, but to a certain number, the fragmentation degree and stress wave energy tends to be stable gradually. When the joint discontinuity degree is little, the fragmentation degree of rock mass is low and the failed units uniformly distributed from top to bottom relatively. With the increase of the length of joint, the fragmentation degree of rock mass becomes more and more serious, and the failed units mainly appear in the rock above the joint. When the joint dip angle is little, the upper rock is fractured more obviously and easy to form new cracks relatively. With the increase of the joint dip angle, the damage range expanded, and the rock mass is more difficult to form new cracks. Besides, the fracture effect of rock mass with a joint dip angle of 45°-60°,is the best. The more amplitude of stress wave is, the more serious the fragmentation degree of rock specimen is. When the amplitude of stress wave reaches a certain value, multiple cracks will be formed near the joint and extend upward and downward, which will cause the rock mass to fully fracture. Finally, the damage of rocks with different joint discontinuity degrees is compared with the damage of split Hopkinson pressure bar test. This method is proved to be reasonable and reliable by the similar conclusion.