猴子包危岩体变形机理及稳定性预测
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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.
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.
引文
[1]王尚庆,等.长江三峡滑坡监测预报[M].北京:地质出版社,1999.
[2]刘传正,张明霞.链子崖T11-T12缝段危岩体开裂变形机制[J].地学前缘,1996,3(1~2):234-—40.
[3]刘宏,宋建波.缓倾角层状岩质边坡小危岩体失稳破坏模式与稳定性评价[J].岩石力学与工程学报,2006,25(8):1606—1611.
[4]孙云志,任自民,等.奉节李子垭危岩体稳定性研究[J].长江流域资源与环境,1994,25(9):48—53.
[5]陈洪凯,唐红梅.三峡库区危岩稳定性计算方法及应用[J].岩石力学与土程学报,2004,23(4):614—619.
[2]刘传正,张明霞.链子崖T11-T12缝段危岩体开裂变形机制[J].地学前缘,1996,3(1~2):234-—40.
[3]刘宏,宋建波.缓倾角层状岩质边坡小危岩体失稳破坏模式与稳定性评价[J].岩石力学与工程学报,2006,25(8):1606—1611.
[4]孙云志,任自民,等.奉节李子垭危岩体稳定性研究[J].长江流域资源与环境,1994,25(9):48—53.
[5]陈洪凯,唐红梅.三峡库区危岩稳定性计算方法及应用[J].岩石力学与土程学报,2004,23(4):614—619.
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