柏永岩, 聂德新. 2009: 茨菇滑坡滑带土扰动样强度参数取值分析及滑坡稳定性评价. 工程地质学报, 17(4): 496-502.
    引用本文: 柏永岩, 聂德新. 2009: 茨菇滑坡滑带土扰动样强度参数取值分析及滑坡稳定性评价. 工程地质学报, 17(4): 496-502.
    BAI Yongyan, NIE Dexin. 2009: STRENGTH OF DISTURBED CLAY IN SLIDING ZONE |OF CIGU LANDSLIDE AND |ASSOCIATED STABILITY ANALYSIS. JOURNAL OF ENGINEERING GEOLOGY, 17(4): 496-502.
    Citation: BAI Yongyan, NIE Dexin. 2009: STRENGTH OF DISTURBED CLAY IN SLIDING ZONE |OF CIGU LANDSLIDE AND |ASSOCIATED STABILITY ANALYSIS. JOURNAL OF ENGINEERING GEOLOGY, 17(4): 496-502.

    茨菇滑坡滑带土扰动样强度参数取值分析及滑坡稳定性评价

    STRENGTH OF DISTURBED CLAY IN SLIDING ZONE |OF CIGU LANDSLIDE AND |ASSOCIATED STABILITY ANALYSIS

    • 摘要: 位于近坝库区的茨菇滑坡,在水库正常蓄水后有近1/3坡体浸没于水位面以下,蓄水前后的滑坡稳定性对工程影响很大。滑坡区地质环境条件复杂,滑坡成因机制为弯曲折断-滑移的地质力学模式。本文进行了对滑坡区扰动样滑带土在不同含水率条件下的剪切强度试验,试验结果表明,粘聚力与含水量相关性好,而摩擦系数则变化不大。结合极限平衡及有限元数值计算,对茨菇滑坡在蓄水前后天然、暴雨及地震工况条件下的稳定性进行分析。结果表明蓄水前滑坡处于稳定状态,水库蓄水以后,天然工况及暴雨工况下滑坡仍然处于稳定状态,地震工况下,滑坡的稳定性系数在1.0以下,滑坡可能失稳破坏。

       

      Abstract: The Cigu landslide is located near a reservoir region. Its stability would be largely influenced after water is stored in the reservoir because the water level will be at 1/3 of the landslide slope height. Geological conditions of the landslide are complex and the progressive mechanism is toppling or slip. This paper examines the slide zone clay shear strength with different moisture contents. The test results show that the cohesion has a good correlation with the moisture content but the friction does not have a good correlation. The landslide stability before and after the storage of reservoir water is analyzed with limit equilibrium method combined with FEA under conditions of natural heavy-rain and earthquake. The numerical analysis shows that the landslide would be stable after water storage under native and rainstorm conditions, but unstable under earthquake. The factor of safety is less than 1, which indicates the landslide instable.

       

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