摘要
根据汶川地震典型高速远程滑坡坡体结构特点及坡体对地震动的响应,认为地震波是造成山体变形破坏的原动力,强烈的地震动是触发岩体高位剪出并被抛射的主要原因。滑坡体被抛射后,撞击铲刮坡面形成高速碎屑流作远程运动,其运动距离决定其造成危害的大小,在不考虑地震长持时的情况下,其后续运动距离决定于不同的内部控制因子,统计分析表明:发震断裂只有触发效应以及"上/下盘效应",与灾害规模无关,多半滑坡发生于平均坡度为30°～45°坡体结构,滑坡体运动距离L与其拔河高度H具有很好的相关性,坡体拔河高度越大,滑坡体滑过的区域面积及堆积体积就越大,滑坡运动距离就越远,运动性就越强,造成的灾害也就越大。
According to the structural characteristics and the ground responses for earthquake motion of typical high-speed distant landslide induced by the Wenchuan Earthquake,believe that the seismic wave was the prime driving force for the mountain deformation and break,the strong ground motion was the main reason for the landslide body being sheared and ejected.Then the landside mass crushed and scraped the slope and transformed into debris flow quickly for long-range movement which determine the extent of disaster,and the running out distance of the large-scale landslides were determined by different controlling factors for the ignorance of the role of long duration earthquake,the statistical analysis shows that：The seismogenic fault only have trigger effect and hanging wall/footwall effect,which has nothing to do with the running out distance and the disaster extent,the running out distance L has good correlation with the relative height H,the larger of relative height H,the greater of landslide area and accumulated volume,the longer of running out distance,the stronger of motility,and the severer cause of the disaster.
出处
《灾害学》
CSCD
2010年第B10期120-126,130,共8页
Journal of Catastrophology
基金
国家重点基础研究发展"973"计划资助项目(2008CB425802)
关键词
汶川地震
高速远程滑坡
力学机理
运动距离
控制因子
Wenchuan earthquake
high-speed distant landslide
mechanical mechanism
running-out distance
controlling factors
