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Abstract Using the self-developed small-scale model flume，combined with the controllable intensity artificial rainfall simulator，the experiment of debris flow induced by artificial rainfall is carried out to study the influence of rainfall intensity on debris flow starting progress. Based on molar heat capacity principle，precise measuring instrument PF-Meter is used to measure variation relation of matrix suction with water content；and pore water pressure gauge is used to measure the performance of pore water pressure during rainfall process. Based on the water-soil interaction mechanism combining with the changes of pore water pressure and matrix suction，the macro influencing factors of debris flow are analyzed. Using the CCD camera and software GeoDip，motion characteristics of sand particles in sandy soil and water-soil interaction mechanism of debris flow are both studied from microscopic view，which indicate that the motion of sand particle under the action of rain is the main influencing factor of water-soil interaction mechanism during the starting process of debris flow.
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Received: 21 June 2011
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2011, Vol. 30 
