青藏高原察达高速远程滑坡运动过程与形成机理

Movement Process and Formation Mechanism of Rock Avalanche in Chada,Tibet Plateau

为了了解青藏高原察达高速远程滑坡的运动过程与形成机理,运用遥感测绘、无人机地形测绘和现场勘查资料对滑坡进行分区,对滑坡形成机理进行研究,并利用PFC^(2D)数值模拟对地震工况下滑坡运动过程进行模拟.将察达高速远程滑坡分为源区,流通区和堆积区;数值模拟结果得到滑坡平均运动速度为15~20 m/s,运动时间150 s,最大运动距离为2 800 m.察达滑坡为地震条件下诱发的高速远程滑坡,源区砾岩对上部堆积体后缘铲刮推移,使得上部堆积体产生整体变形,其运动过程可分为崩滑→铲刮→滑移→堆积4个阶段.

To understand the kinetic mechanism of Chada rock avalanche in Tibet plateau,remote sensing mapping,UAV topographic mapping and field survey data are used to zone the rock avalanche and research the formation mechanism of the rock avalanche.PFC^(2D) numerical simulation is used to analyze the rock avalanche movement process under the seismic conditions simulation.The Chada rock avalanche can be divided into source zone,transition zone and accumulation zone.The average movement speed of this rock avalanche is 15-20 m/s.Its duration time is 150 s,and the maximum movement distance is 2 800m.The Chada rock avalanche was induced by earthquake.The source zone rock mass scrapes and moves the trailing edge of the upper accumulation which resulting in the overall deformation of the upper accumulation.Its movement process can be divided into four stages:collapse → scraping → sliding → emplacement.