The Research of Permeability on Lose Gravelly Soil in Debris Flow Original Area
Choose the debris flow original area, on loose gravelly soilslope, to do permeability experiment. The experiment area is 4000cm2. The Shower nozzle is used to produce rains. The precipitation is controlled by block up some of the hole on shower nozzle. Therefore, the infiltration rate is gotten. It is found that the rate of stable infiltration is 0.11 mm/min. The initial infiltration is 0.55 mm/min. From the test data the value of β is obtained,β=0.56.Therefore, the permeability formula be written as Fp=0.11+0.44e-0.56t This rormula can be used to calculate the runoff resulted from excess rain in debris flow original area. The ratio of the amount of runoff to that of debris flow can be obtained. In terms of the raining processes of Dawazi gully between 0～12 o'clock on June 15～16,1994,the runoff resulted from excess rain is gotten. It is found that the rate of runoff is 0.415 mm/min. This value take17.8％ of the total discharge of debris flow.
the debris flow original areagravelly soilpermeability
NETL
NSTL
万方数据
维普
