Earthquake can cause significant rock fracturing in either the short or long terms. A comprehensive analysis of the fracturing mechanism is critical for assessing the risks of potential slope failures, landslides and rock avalanches in seismic prone areas. This study employed 2D discrete element method (DEM) to investigate the fracturing of an intact rock slope of 600 m in base length and 300 m in height, with explicit considerations of material heterogeneity by random field theory. A total of 5400 DEM simulations were performed, and the characteristics of slope fracturing were statistically analysed. The dynamic loading by earthquake has triggered significant amplifications of ground motion and slope damage at the slope crest, resulting in densely spaced and interconnect fractures. These fractures split the slope into a collection of rock fragments with varied shapes, and the fragment size followed the Weibull's cumulative distribution. More than 70% of generated fragments were finer than 0.1 times the initial slope size, while only few large fragments existed at the slope base. The fragment size distribution pattern could quantitatively agree with field observations. The distributions of final slope damage index and cumulated fragmentation energy all followed the normal distribution pattern. The overall bulk seismic energy input into the slope was dissipated mainly at discontinuities and decreased with the increase of slope inclination.

地震会在短期或长期内造成严重的岩石破裂。全面分析压裂机制对于评估地震多发区潜在的斜坡破坏、滑坡和岩石雪崩的风险至关重要。本研究采用二维离散元法 (DEM) 研究了基长 600 m、高 300 m 的完整岩石边坡的压裂，并通过随机场理论明确考虑了材料的非均质性。共进行了5400次DEM模拟，对斜坡压裂特性进行了统计分析。地震引起的动力荷载在斜坡顶部引发了地震动和斜坡破坏的显着放大，导致了密集间隔和相互连接的裂缝。这些裂缝将斜坡分裂成形状各异的岩石碎片集合，碎片大小遵循威布尔累积分布。超过 70% 的生成碎片细于初始坡度大小的 0.1 倍，而坡底仅存在少量大碎片。片段大小分布模式可以定量地与现场观察一致。最终边坡破坏指数和累积破碎能量的分布均符合正态分布规律。输入斜坡的整体地震能量主要在不连续处消散，随着斜坡倾角的增加而减小。而斜坡底部只存在少量大碎片。片段大小分布模式可以定量地与现场观察一致。最终边坡破坏指数和累积破碎能量的分布均符合正态分布规律。输入斜坡的整体地震能量主要在不连续处消散，随着斜坡倾角的增加而减小。而斜坡底部只存在少量大碎片。片段大小分布模式可以定量地与现场观察一致。最终边坡破坏指数和累积破碎能量的分布均符合正态分布规律。输入斜坡的整体地震能量主要在不连续处消散，随着斜坡倾角的增加而减小。