Experimental model of debris flow impact features

This paper developes the physical experimental model for the valley-shaped debris flow, and draw up 15 operating modes in accordance with three sets of particle solids at 0.3~0.8 cm, 0.8~15 cm and 1.5~3.0 cm in diameter and fluid at the solid to liquid (RSL) rate of 0.02, 0.08, 0.16, 0.20 and 0.25. It conducts more than 40 simulations, and obtained 85 000 data using the new test methods such as Fastcam-ultima1024 typed CCD camera, HS200 typed dynamic transducer and multi-channel strain instrument. The experimental results show that the debris flow fluctuation becomes obvious at low RSL, the debris flow surge gradually embodies with the increase of RSL and the initial surge appears ahead of time with the increase of particle diameter. The impact forces of debris flow trend to increase nonlinearly with the increase of RSL and particle diameter, however, the flow speed at the mouth of debris flow valley trend to decrease with RSL increase. The studies may produce some valuable enlightenment in debris flow impact simulations and theory basis for various slurry viscosity and RSL.