Abstract: Hitherto, as one of typical geologic disaster, unstable rock is the coarsest in studies, especially it is in description or semi-quantity stage that identification and classification of unstable rock, stability analyses and control effectively. According to unstable model unstable rock can be classified into three, i.e. sliding unstable rock, toppling unstable rock and falling unstable rock. Up to now, three case usually are provided in stable analyses, i.e. case 1(composed of weight of unstable

Key words: sliding unstable rock, FEM simulation, displacement field, stress field, control design case

摘要： 危岩是迄今国内外研究最薄弱的地质灾害类型之一，尤其在危岩分类及识别、发育机理、稳定性分析及有 效防治方面目前处于定性、半定量阶段。根据危岩失稳模式可将危岩分为滑塌式危岩、倾倒式危岩和坠落式危岩 三类[l]，目前在进行危岩稳定性分析中，拟定了三种荷载组合工况，分别是工况一(自重+天然状态裂隙水压力)、 工况二(自重+暴雨状态裂隙水压力)和工况三(自重+天然状态裂隙水压力+地震)。本文通过对滑塌式危岩有限元数 值模拟，基于位移场和应力场分析得到工况二为最不利工况的重要结论，换言之，工况二即为滑塌式危岩治理工 程的控制设计工况。

关键词: 滑塌式危岩, 有限元数值模拟, 位移场, 应力场, 控制设计工况