猴子包危岩体变形机理及稳定性预测  

Deforming Mechanisms and Stability Forecast of Houzibao Dangerous Rock Body

作　　者：董好刚[1] 彭轩明[1] 陈立德[1] 刘广宁[1] 

机构地区：[1]宜昌地质矿产研究所,湖北宜昌443003

出　　处：《华南地质与矿产》2008年第4期56-63,共8页Geology and Mineral Resources of South China

基　　金：国土资源大调查项目(项目编号:200602)

摘　　要：猴子包危岩体位于巴东县信陵镇火焰石村长江右岸。危岩体由包含层间错动带等软弱夹层的层状灰岩组成,下伏煤系软岩,具有上硬下软的结构;西侧陡崖下部采煤,斜交坡面的陡倾角裂缝将陡崖切割成链条式块状结构,发生多次崩塌。结合本区发生的崩塌,分析了猴子包危岩体形成发育的环境地质条件、变形失稳的机理和力学模式;运用力学图解的方法对危岩体不同工况下的稳定性进行了预测。研究认为,危岩体在自然状态下是稳定的,在地震及动水压力作用下不稳定,破坏方式为倾倒,视倾角αs(合力角)达到临界倾角α0是危岩体从变形到倾倒崩塌的拐点。Houzibao dangerous rock is situated at Huoyanshi village in Badong County on the right bank of Yangtse Rive. It is cut by many cracks and become dangerous. The paper presents a systematical and detailed description of the engineering geological conditions. Based on the analysis, it proposes the possible failure models. Mechanical Criterion scheme of dangerous rock with block structure is applied to forecast the deformation and stability of Houzibao dangerous rock. Conclusion can be drawn from the analysis： the dangerous rock is stable under normal condition, but unstable under abnormal condition. It begin to tilt when obliquity up to （or ？？？ reach to ） the critical obliquity.

关 键 词：猴子包危岩体 上硬下软 变形机理 稳定性 

分 类 号：P642.2[天文地球—工程地质学]