震后山体危岩发育特征及变形机制分析

Analysis on the Development Characteristics and the Deformation Mechanism of the Shattered Mountain Dangerous Rocks

文中主要阐述了震裂山体存在的危岩体的分布特征,在此基础上总结出危岩体的几种类型和演化机理。根据地震区的震裂山体危岩体的调查得出:震裂山体危岩体的分布与地震烈度、地形高程、岩性、原有结构面有着密切的关系。根据裂缝的变形特征将震裂山体危岩体分为三种类型:裂开错动型、震裂未动型、崩塌后推型。地震荷载作用下山体裂缝的产生和扩展,是由于地震波的纵波和横波的作用。暴雨对震裂危岩体的稳定性影响很大,当危岩体后缘裂缝充水高度达到临界值后,裂缝开始扩展,对危岩体的稳定性不利。

In the paper,the author mainly expounds the distribution characteristics of the shattered mountain dangerous rocks,sums up several types and evolution mechanism.The author obtains the distribution of the shattered mountain dangerous rocks have the close relation with the seismic intensity,the terrain the elevation,the litho logy,the original structure surface according to survey the shattered mountain dangerous rock in the quake zone,and divides the shattered mountain dangerous rocks into three types:crack movement type,shatter not dynamic type and collapsed push type by the deformation mechanism.The generation and the expansion of the mountain cracks are due to the effect of longitudinal waves and shear wave seismic waves under the seismic loads.Rainstorm largely impacts on the stability of the shattered dangerous rocks.Cracks began to expand when the water-filled height of the rocks cracks reaches a critical value.It is unfavorable for the stability of the dangerous rocks.