A layered rock slope often forms an anti-dip state due to tectonic movement in the historical past. In the mountainous gorge area of Southwest China, the layered rock slopes are prone to toppling and deformation due to the influence of gravity and in situ stress. The stability of these slopes after excavation is very important. The failure modes and laws of anti-dip slopes are mainly affected by factors such as lithology, dip angle and rock thickness. In this paper, the excavation process of a slope was simulated by the discrete element method, and the stability after slope excavation was analysed by comparison with field monitoring data, taking the high rock slope of a hydropower station as an example. In addition, the influence of different factors on the anti-dip rock slope was analysed by setting different factors in the model. The rock thickness was set to 5, 10, 15, 20, 25, 30 and 35 metres for the same excavated model. The dip angle of the rock was set to 65, 70, 75, 80 and 85 degrees. Two major lithologies, hard rock (sandstone) and soft rock (slate), were considered in this study. The results show that the thickness and dip angle of the rock strata affected the scale of the deformation zone and the stability of the anti-dip stratified slope. However, the lithology of the anti-dip rock slope determined the failure mode of toppling failure.

由于历史过去的构造运动，层状岩石斜坡经常形成反倾角状态。在西南山区的山区，由于重力和原地应力的影响，层状岩石边坡容易倾倒和变形。开挖后这些斜坡的稳定性非常重要。反倾角的破坏方式和规律主要受岩性，倾角和岩石厚度等因素影响。本文采用离散元法对边坡开挖过程进行了模拟，并与现场监测数据进行比较，分析了边坡开挖后的稳定性，以某水电站高边坡为例。此外，通过在模型中设置不同的因素，分析了不同因素对反倾角岩石边坡的影响。对于相同的挖掘模型，岩石厚度设置为5、10、15、20、25、30和35米。岩石的倾角设置为65、70、75、80和85度。这项研究考虑了两种主要岩性，硬岩（砂岩）和软岩（板岩）。结果表明，岩层厚度和倾角会影响变形带的尺度和反倾角分层边坡的稳定性。然而，反倾角岩石的岩性决定了倾覆破坏的破坏模式。结果表明，岩层厚度和倾角会影响变形带的尺度和反倾角分层边坡的稳定性。然而，反倾角岩石的岩性决定了倾覆破坏的破坏模式。结果表明，岩层厚度和倾角会影响变形带的尺度和反倾角分层边坡的稳定性。然而，反倾角岩石的岩性决定了倾覆破坏的破坏模式。