根据某高速公路K146+160～K146+440高边坡的实际地质地形特征,建立了三维边坡开挖数值模型,模拟了该边坡在无支护及适时支护两种工况下的开挖变形形态、应力状态、最大剪应变增量以及塑性区的分布,并分析了开挖边坡的稳定性。结果表明,边坡适时支护后,既有效控制了变形,又提高了边坡岩土体强度,保证了边坡在开挖过程中的稳定性和成坡后的长期稳定性。 According to the actual geological topographic features of K146 + 160 ~ K146 + 440 high side slope of a highway, a numerical model of three-dimensional slope excavation was set up to simulate the excavation of the slope under both unsupported and timely support conditions Excavation deformation shape, stress state, maximum shear strain increment and distribution of plastic zone, and analyzed the stability of excavation slope. The results show that the timely support of the slope not only effectively controls the deformation but also enhances the strength of the slope rock and soil so as to ensure the stability of the slope during excavation and the long-term stability after slope formation.