In order to understand the initiation model and mechanism and forecast and prevent the debris flow after earthquake, designing the facilities of debris flow initiation according to the environment post-earthquake to study the debris flow initiation mechanism. In this study, the 25 groups test were carried out at different slopes using the same soil material to study the debris flow initiation of debris flow at varies slopes, the results show that: 1. The initiation model of debris flow is erosion → gully → collapse → block → failure and transformed into debris flow between 8°-12° as initiation due to dam-failure; 2. The initiation model of debris flow is increased erosion gradually (down cutting erosion, back word cutting and lateral erosion) with the bulk density increasing and transformed into debris flow between 13°-17° as initiation due to erosion; 3. The initiation model of debris flow is surface flow → infiltration → failure → fluidization and transformed into debris flow between 18°-25° as initiation due to slope failure; 4. The change character of water pore-pressure is different at different slope experiments; the water pore-pressure inner soil reveals the initiation mechanism of debris flow at different slope. The prevention programmer could reference for the results of initiation model at different at varies slopes and carry out the different plan; the change characters of water pore-pressure revealed the initiation process of debris flow could be used forecast debris flow initiation for post-earthquake reconstruction projects.
