贵州都匀马达岭滑坡运动特征研究

Study on Motion Features of the Landslide in Madaling of Duyun in Guizhou Province

在暴雨触发作用下,2006年5月18日贵州都匀马达岭发生滑坡,滑体随即形成的碎屑流,充填了坡下长达1km的沟谷。滑坡堆积物在空间上有明显的分区特征,由上至下可分为滑源区、滑体堆积区、碎屑流流通区、碎屑流堆积区四个区域进行研究。在对马达岭滑坡进行详细野外调查的基础上,从滑坡的地形条件、堆积情况及运动特征等方面探讨滑坡的发生机理及运动过程,结果表明:马达岭滑坡为一高速远程滑坡,滑坡迅速启动并在特殊的破坏模式和地形条件下,形成了"一快一慢"两种不同的运动方式,即大块岩体"坐着"下伏流体的缓慢运移以及碰撞、铲刮形成的碎屑物质的高速抛飞。

The Madaling landslide is caused by heavy rains and happened on May 18, 2006 in Duyun of Guizhou province. The debris flow filled the one--meter depth ravine at the foot of the mountain. From up to down, land- slide debris can be divided into source area of landslide, landside accumulation zone, moving region of debris flow and debris flow accumulation zone. On the basis of in detail field investigation of Madaling landslide, from terrain and accumulation conditions, and movement characteristics of the landslide, and discussed the occurrence of mecha- nism and motion process, Based on detailed field survey, this paper analyzes the occurrence mechanism and the mo- tion of landslide from terrain condition, accumulation and motion characteristic. The result shows that Madaling landslide is a high--speed and long--range landslide which has two motion patterns. One is slow--moving of large rocks, and the other is high--speed flying of debris.