Effective reservoir capacity of retaining dam and impact force of debris flow are important indexes for the design of entity check dam of debris flow.Deposits or even fills in the existing entity check dam under repeated impact of debris flows,have great influence on the control ability of dam body.In this paper,based on theoretical analysis and physical model test,dynamic response of debris flow impinging entity check dam under the condition of silting behind dam is studied,dimensionless calculation formulas of velocity attenuation rate and retaining rate of dam body under the condition of silting behind dam are derived,and calculation model of impact force of debris flow under the condition of silting behind dam considering spatial distribution characteristics is established.The results show that the velocity attenuation rate and dam retaining rate of debris flow are positively correlated with the ratio of silt height to silt length and the relative density of debris flow.The combined calculation model of impact force and static and dynamic load of debris flow can better reflect the composition and distribution of impact force of debris flow under the condition of silting behind the dam.This study can provide theoretical and technical support for the design of solid debris flow retaining dam engineering.
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