Landslide model test to investigate the spreading range of debris according to rainfall intensity

摘要

Landslide model experiments by considering rainfall intensity were performed to investigate andpredict the spreading range of debris. The model flume and the rainfall simulator were designed and manufacturedfirstly,and a series of model experiments were performed. The model experiments were performed with changingthe rainfall intensity from 150 mm/hr to 250 ram/hr. In these experiments,the angle of slope inclination is 25~ andthe relative density of slope soils is 35%. In order to measure the pore water pressure in a slope,the deformationof slope surface,and the spreading range of debris during experiments,the instrumentation was installed in theslope. As a result of instrumentation,the pore water pressure is increased rapidly at the time of landslides,andthe pore water pressure in a slope and the scale of landslide are increased with increasing the rainfall intensity.In addition,the shape of spreading range of debris looks like a bulged pan,and the spreading range is increasedrapidly in its early stage and then increased gradually. The increasing velocity of spreading range is influencedby the rainfall intensity,and the final spreading area after heavy rainfall depends on the rainfall intensity andthe rainfall duration time.