PREDICTION OF LANDSLIDE TRAVEL DISTANCE WITH 2-D NEWTON FLUID DYNAMICS

This paper assumes the following four conditions. The movement of the landslide mass meets the requirements of Newton fluid dynamics equation. There is only lateral pressure inside the moving mass. The volume of the mass does not change. And all energy loss during motion is caused by friction in the motive model proposed by Sassa Kyoji. It derives the two dimensional movement formulas on the basis of the four assumptions. Meanwhile, the simulation program is compiled for the formulas. A case study is carried out. It is about Yanlian Yuanyoushan loess slow transitional landslide in Yanan City, Shaanxi Province. The geological model is set up by recoverying the topography before sliding and seeking out the slip surface by in-suit drilling. In the two-dimensional motive simulation, different residual friction angles are adopted as the sliding frictional angle. The results show that the run-out distance and the accumulation form are both very close to the in-situ measured results. Finally, the possible run-out distance of the critical slope on the left side of Yanlian yuanyoushan landslide is predicted with this movement model. And the potential hazards are also assessed. The result presented in this paper can provide a simple and applicable method of prediction for the sliding distance of landslides.