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以2008年11月三峡库区龚家方2号斜坡破坏问题为基础,采用离散元软件PFC2D对此斜坡进行模拟,模拟结果表明,三峡水库蓄水后,斜坡上覆崩坡积层会沿着岩土分界面向下滑动;整个滑动过程可以分为底端变形、上段及中段垮塌、整体滑动、固化稳定等4个阶段,其中底端变形形成的“鼓包”是否破裂是斜坡启动的关键;斜坡的滑动速度在初始阶段速度会迅速增大,之后缓慢减小,直至稳定。将模拟结果与观测资料对比分析,与实际破坏情况一致,说明二维离散元软件PFC2D能够较好地模拟三峡库区龚家方2号斜坡破坏过程。
Based on the failure of Gongjiafang No.2 slope in the Three Gorges Reservoir area in November 2008, the discrete element software PFC2D was used to simulate the slope. The simulation results show that, after the Three Gorges Reservoir is impounded, The interface slides downward; the whole sliding process can be divided into four stages of bottom deformation, collapse of the upper section and middle section, overall sliding and solidification stability, and whether the “drum bag” formed by the bottom deformation breaks down is the key to start the slope; The slope’s slip speed increases rapidly in the initial phase, then slowly decreases until it stabilizes. Comparing the simulation results with the observed data, it shows that the two-dimensional discrete element software PFC2D can well simulate the failure process of Gongjiafang No.2 slope in the Three Gorges Reservoir area.