抄録
In order to find out the physical parameters which are useful to the prediction of steep sandy slope failure due to rainfall, behavior of physical parameters such as degree of saturation within the slope, pore water pressure at the bottom, and surface displacement were examined by the slope failure experiments and the numerical simulations. In the numerical simulations, mechanical model for slope deformation due to rainfall proposed by the author was used. These examinations bring the results as follows.
1) In the case of lower inclination of the slope, the degree of saturation in the slope starts increase earlier and is larger than in the case of higher inclination. And pore water pressure is often generated and follows the increase of degree of saturation at the lower layer of the slope. Surface displacement only increases remarkably after the generation of pore water pressure. So the degree of saturation at the lower layer can be a useful parameter for the prediction in the case of lower inclination of the slope.
2) In the case of higher inclination of the slope, surface displacement starts remarkable increase much earlier than in the case of the lower inclination while there is no generation of pore water pressure. So surface displacement is a useful parameter for the prediction in the case of higher inclination of the slope.
