An analysis of the kinematics characteristics of the gravel rockfall deposit induced by earthquake

The Wenchuan earthquake caused lots of rockfall in the engineering area,supplying many phenomena of thenatural rockfall tests. The huge gravel rockfall deposit that was caused by the Wenchuan earthquake in the Hongyan holiday resort of Du Jiangyan,Qing Chenghou mountain is analyzed and the focus of this paper is mainly on analyzing its kinematics characteristics.The value of the reach of angle of the rockfall deposit was measured in the site.The reasons leading to the number of the angle larger than the obstruction of the plants and the building over the original slope are analyzed with the methods of investigation and numerical simulation.Statistics of the distribution of the rockfall deposit along the valley were gained by analyzing the portion of different sizes of the rock blocks at the turning of the gravel,and the portion of the numbers of different sizes of the rock blocks at the turning at the whole statistical region.By the analysis,1 / 4 of the number of the whole rock blocks( 1 m3)were trapped at the turning of the gravel on average.The results show that it is of great significance to research the kinematics of the rockfall deposits and to decrease the rockfall hazards by analyzing the characteristics of distribution and migration of the rockfall deposit caused by natural forces.