No abstract

The deposition thickness is one of the most important parameters of debris flow. How to define the deposition shape along the viscous debris flow gully and how to calculate deposition thickness rationally were rarely studied in previous researches. This paper discussed the calculation method of deposition thickness of viscous debris flow based on theoretical deduction. Firstly, force analysis was carried out for a debris flow cell selected from the deposition. Then, the formula for calculating the deposition thickness of viscous debris flow was constructed based on deduction from the viewpoint of theoretical mechanics. At last, the deposition thickness under different slope gradients, yield stresses and densities was calculated based on the deduced formula. The results showed that the deposition thickness decreases with the increasing of the slope gradient and density, and increases with the increasing of the yield stress before the deposition thickness reaches to the maximum value.