Abstract: Laboratory model tests are performed to study the characteristics of movement and accumulation of landslide-debris under different constraints. The effects of the gradient of slope and the chute sidewall on the accumulation scope and accumulation characteristics are investigated. Testing results show that when slope angle increases, the final run-out and accumulation area increase for the fine particles deposit, but for the coarse particles deposit, they increase first and subsequently decrease. However, for both of deposits, the accumulation width decreases and the thickness increases. The landslide movement is obviously influenced by the chute width. With the increase of the chute width, the final run-out slightly increases, the accumulation area and width significantly increase, while the accumulation thickness becomes smaller. The chute outlet width is a significant factor to influence the final accumulation scope, while the influence of the chute entrance width is relatively small. Theoretically, experimental results contribute to the study of accumulation scope and the form of landslide-debris.

Key words: model experiment, landslide-debris, gradient of slope, chute width, accumulation scope