ARTIFICIAL RAINFALL EXPERIMENTAL STUDY ON LANDSLIDE TRANSLATION TO DEBRIS FLOW
ARTIFICIAL RAINFALL EXPERIMENTAL STUDY ON LANDSLIDE TRANSLATION TO DEBRIS FLOW
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发表时间：
2006
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通讯作者：
Li Yong
中科院分区：
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作者：
Li Yong
在滑坡转化为泥石流实验的基础上，把握滑坡转化为泥石流的过程是非常重要的。在位于蒋家沟泥石流源区的万坊子进行了4次人工降雨试验，并在堆积区进行了4次试验。蒋家沟是著名的泥石流沟。在对整个流域进行调查后，确定了这些试验的条件和地点。在试验过程中，通过一些先进的设备测量了一些土壤参数。这些参数是水势、含水率、孔隙水压力和土壤温度。经过初步分析，确定了这些试验的条件和位置。主要结论如下：(1)在强降雨作用下，滑坡转化为泥石流的机理为振动软化或振动液化，土体强度可用振动引起的颗粒级配、饱和度和孔隙水压力的函数来表示；(2)当土体破碎时，土体可能是非饱和的，因此没有应用饱和液化机理；(3)当水势曲线下降时，土体强度的起伏过程得到验证；(4)土体破碎过程中存在能量交换；(5)在强降雨作用下，由于土体破碎时出现泥石流特征，很难区分滑坡的启动和泥石流的形成。
It is important to grasp the process of landslide translation to debris flow on the basis of the experiment of landslide translation to debris flow.Four artificial rainfall experiments have been carried out at Wanfangzi,located in the debris flow source area of Jiangjia Ravine,and other four experiments have been performed at the deposit area.The Jiangjia Ravine is a famous debris flow gully.After investigating whole drainage area,the conditions and locations of these experiments are determined.In the process of these experiments,some soil parameters have been measured through some advanced equipments.These parameters are water potential,water content,pore water pressure and soil temperature.After primary analysis have been completed,some basic characteristics of wide-graded gravel soil are presented.Main conclusions include:(1) under the strong-intense rainfall,the mechanism of landslide translation to debris flow is the vibration softening or the vibration liquefaction,and the soil strength can be expressed by the function of grain grade,saturation,and pore water pressure induced by the vibration and infiltration rate;(2) when soil is broken,the soil may be unsaturated,so the mechanism of saturation liquefaction has not been applied;(3) when the curve of water potential declines,the process of soil strength fluctuation will be validated;(4) the energy exchange exists in the process of soil break;and(5) under the strong-intensity rainfall,it is difficult to distinguish the start of landslide against the formation of debris flow,because the characteristics of debris flow appear when soil is broke.