美姑河火洛村溃散型滑坡的成因动力学机理研究

Study on Kinetic Characteristics of Huoluo Landslide in Meigu River

以火洛村古滑坡为研究对象,调查研究区地质构造和地形环境条件,查明滑坡山体的破坏现象和岩体结构,分析滑坡发育特征,建立山体地质结构模型,采用数值计算反演滑坡山体破坏的成因,探讨溃屈的诱导因素及临界动力强度。结论如下:滑坡于晚更新世中晚期形成,具有溃散性高速远程碎屑流的特点;斜坡底部软弱带及陡倾节理控制山体结构及滑坡发育特征,其对地震动力的响应显著;溃屈临界地震加速度为0.3 g。

This paper takes the Huoluo ancient landslide as the research object,investigates the geological structure and the terrain environment,finds out the destructive phenom enon and the rock mass structure of the landslide,analyzes the developm ent characteristics and the mechanism of the landslide,and establishes the conceptual model of the mountain geological structure.The cause and formation process of landslide damage are analyzed by numerical simulation,and the induced factors and critical dynamic strength of buckling initiation are discussed.The main conclusions are as follows:The landslide accumulation is characterized distance and high speed debris flow.Landslide formattedin the middle-late Late Pleistocene,the numerical calculation shows that the eartliquake action force of landslide buckling is0.3g%The weak belt and control the structure of the mountain and boundary characteristics of the landslide,and the response to earthquake dynamics is significant.