ANALYSIS ON KINEMATICS CHARACTERISTICS AND MOVEMENT PROCESS OF DAGUANGBAO LANDSLIDE

Daguangbao landslide is the largest landslide triggered by the Wenchuan MS 8.0 Earthquake on May 12, 2008. Its formation mechanism and kinematics attract a remained and wide attention of scholars at domestic and abroad. The paper is based on summary analysis of the engineering geological survey on the movement characteristics of landslide. The kinematics characteristics of the landslide is studied systematically. In addition, in order to reproduce the logical phenomenon in the process of sliding, physical model simulation is conducted for comparison. The results show the follows. The investigation and analysis of the slickenside, iconic features, vegetation, flat stone trend, slide cracks, and other topic features of the landslide accumulation determines the sliding direction, distance, velocity, motion eigenvalues and other movement characteristic parameters. The formation mechanism of landslide dust, blast shockwave, mixed lithology belt in the leading of slide tongue and clastic flow are systematic discussed. Landslide movement process physical simulation test confirms that Daguangbao landslide movement process has geological phenomenon such as cutting through of the front locking secting and enjection, blast shockwave, dust,suddeyly braking,significantly movement stage. Basically, its movement process can be dived into the following four stages, from quickly launching to high-speed sliding to suddenly braking and napping motion to detaching sliding on both sides of the accumulation.