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Title:: The Wenchuan M_S8.0 Earthquake:Slope Stability in the Disaster Area of Zhaotong,Yunnan

Author(s):: ZHANG Yan-qi; LI Jian-ming; HUA Jun; (Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)

Keywords:: Wenchuan M_S8.0 earthquake; disaster area of Zhaotong; seismo-geologic condition; seismicity; slope; stability

摘要:: 通过分析汶川8.0级地震昭通灾区地形地貌、地质构造和岩石等地震地质条件的特点,认为山高坡陡、发育大量高边坡的地形地貌致使山体的边坡稳定性差; 而长期活动的断裂发育,致使山体岩石节理和裂隙发育、岩层完整性较差,增加了山体边坡的不稳定性; 大强度、高频度的地震活动使地层松动、岩石进一步破碎、危岩增多,加剧了山体边坡的不稳定程度。

Abstract:: We analyze the seismicity and the seismo-geologic conditions in the Zhaotong disaster areas of the Wenchuan M_S8.0 earthquake,including terrain,relief,geologic structure,and rock.We find that the Zhaotong disaster areas are in the terrain and relief of high-mountain and steep-slope,which easily cause the slope of hill unstable.In addition,the development of long-term active faults results in the development of joint and crack of mountain rock,so the integrity of rock is weakened.And strong and frequent seismicity strengthens the extent of rock breaking,which further intensifies the unstability of slope.