降雨诱发型堆积层滑坡的位移动力学特征分析

Analysis of displacement dynamic features of colluvial landslide induced by rainfall

根据降雨诱发型堆积层边坡物质组成特点与位移构成性质,建立了边坡粘弹性位移动力学模型与位移动力学方程,并以此为基础系统分析了其位移动力学行为和特征以及位移与地下水位或降雨量定量关系,发现了边坡的位移动力学特征主要取决于边坡的地下水位及其变化规律,且其位移和位移速度在整体失稳前具有强烈的波动性。上述位移动力学规律表明,仅运用位移或位移速度作为单一动力学响应参数来评价与预测该类边坡稳定性存在一定局限性。因此,选择和建立堆积层滑坡的位移多源信息预测理论与模型将具有重要的理论意义与实用价值。

On the basis of compositional characteristics of the colluvial landslide induced by rainfall, the model and equation of displacement dynamics of colluvial slope have been established. And then, the displacement dynamic pattern and features and the quantitative relationship between displacement and groundwater table or rainfall are analyzed. And it is found that the displacement dynamic features of colluvial slope are mostly determined by the groundwater table and its changing law and that there is a strong wave in displacement and velocity of displacement before the overall sliding of a slope. All the displacement dynamic laws show that it is not reasonable to use the single displacement response parameter of displacement or velocity of displacement to make the judgment and prediction of the stability of this kind of slope. Therefore, it will have a very significant and practical value to establish a multi-parameters prediction theory and model of displacement of the colluvial landslides.