![]() ![]() Results from the three-dimensional distinct element analyses suggest that the presence, orientation and high persistence of a discontinuity set dipping obliquely to the slope were critical to the development of the landslide and led to a failure mechanism dominated by planar sliding. ![]() The kinematic and surface wedge analyses suggest that the location of the slope failure (intersection of the valley slope and a gully wall) has facilitated the development of the unstable rock mass which initiated as a planar sliding failure. The discontinuity orientation data are used to perform kinematic, surface wedge limit equilibrium and three-dimensional distinct element analyses. This paper describes the Chehalis Lake landslide and presents a comparison of discontinuity orientation datasets obtained using three techniques: field measurements, terrestrial photogrammetric 3D models and an airborne LiDAR digital elevation model to describe the orientation and characteristics of the five discontinuity sets present. The landslide is temporally associated with a rain-on-snow meteorological event which is thought to have triggered it. The slope failure caused a displacement wave that ran up to 38 m on the opposite shore of the lake. ![]() ![]() The initiation zone is located at the intersection of the main valley slope and the northern sidewall of a prominent gully. On December 4th 2007, a 3-Mm3 landslide occurred along the northwestern shore of Chehalis Lake. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |