摘要
地震是造成崩塌滚石灾害的诱因之一。以青川某崩塌滚石灾害为例,运用DDA方法,对地震诱发斜坡危岩破坏,发生崩塌滚石的运动过程进行了模拟及研究。结果表明:地震诱发的危岩体因地形及高程产生放大效应时,破坏加剧,运动能力增强;崩塌滚石运动主要以滑动、滚动、跳跃为主;坡面摩擦增大时,能够显著限制滚石的运动能力;DDA方法能够模拟崩塌滚石的运动路径,可以为防护结构的设置位置提供依据。
Earthquake is one of the main causes for rockfall disasters. Based on the rockfall disaster in Qingchuan County, using Discontinuous Deformation Analysis （DDA） method, this paper is mainly focused on the destruction process of unstable rock mass which induced by earthquake. During the movement process, the kinetic characteristics of rockfall are also analyzed in detail. The results suggest that the amplification effect of the dangerous rock mass induced by earthquake caused by topography and elevation intensifies the speed of destruction; the greater the amplification effect, the higher kinetic energy the roekfall gets. The motion of rockfall can be mainly divided into three types： sliding, rolling, and jumping. The increasing slope friction can significantly restrict the kinetic ability of the rockfall. Discontinuous Deformation Analysis （DDA） method is able to simulate the motion path of the roekfall, which provides basis for the location of the protection structure.
出处
《路基工程》
2017年第6期48-53,共6页
Subgrade Engineering
