Abstract:The deposit depth of debris flow is one of the most important parameters in the evaluation and prevention of debris flow. In order to study the influence of debris flow density, accumulation gradient, clay mineral content and other factors on the deposition thickness of debris flow, the flume deposition experiments with different debris flow intensity, clay mineral content and channel slope were studied by flume deposition test.. The results show that: (1) under the same density, the deposition thickness tends to decrease with the increase of deposition gradient. In the range of small slope gradient, the larger the density of the fluid, the larger the deposition thickness, but when the slope gradient exceeds a certain range, the relationship between the deposition thickness and the density is not distinct under the condition of the same slope gradient; (2) under the same slope gradient, with the increase of the density of the debris flow, the deposition thickness shows an increasing trend, and under the same density, the smaller the slope of fluid accumulation, the larger the deposition thickness, but the larger the bulk density, the larger the rate of silting thickness increase; (3) under the same conditions, with the increase of the clay particle content in the debris fluid, in addition, the larger the density of the fluid, the larger the deposition thickness, but the larger the clay content, the faster the deposition thickness increases. It is concluded that the relationship between the deposition thickness of debris flow and the influencing factors is verified by the literature data, which has certain accuracy and usability.