甘肃黑方台焦家滑坡泥流运动过程的模拟

摘要

以黑方台焦家滑坡泥流为例,在野外测量和室内试验的基础上,运用Sassa运动学模型进行该滑坡泥流的运动过程模拟.结果表明,该滑坡在运动初期滑体即脱离滑坡后壁,最大运动速度为22.3 m/s,且速度在17～ 22.3 m/s持续时间达10 s,具有高速运动的特点.根据滑体运动速度-时间曲线,滑坡运动可分为3个阶段:加速阶段、波动阶段和稳定阶段.该地区高陡的坡型、天然含水状态下土体的高强度、饱和状态下土体强度显著降低以及前缘广阔的斜坡地形为滑坡泥流的高速运动创造了条件.%A landslide flow in Jiaojia,Heifangtai platform,Gansu is taken as an example,after the field measurement and laboratory test,the motion model put forward by Sassa is utilized to analyze the motion process of the landslide in Heifangtai.Resuhs show that the sliding body detaches the slope at the beginning of motion.The maximum motion speed is 22.3m/s and the duration time of the speed between 17m/s and 22.3m/s is 10s,implying the landslide flow has high velocity.The whole motion process can be divided into three stages:accelerating stage,vibration stage and stabilizing stage.The high-steep terrain,high strength of natural soil and low strength of saturated soil,as well as the broad slope topography in from of the slope contributes to the high speed if the landslide-flow.