2022 Volume 78 Issue 1 Pages 14-31
Slope failures during rainfall are likely to be induced by an increase in soil water content, an increase in shear stress due to an increase in soil own weight, and a decrease in shear strength due to loss of suction. However, the actual slopes are so complicated that to grasp the process and mechanism of slope failure in detail, which is applicable to predictions or countermeasures, has been a long-standing issue. In the present study, we developed a new centrifugal field rainfall generation system with making a uniform rainfall distribution during centrifugal model experiment, to understand the penetration behavior of rain water into the embankment ground and deformation behavior at the time of collapse by using this system. Moreover, various experiments were conducted to estimate the possibility of predicting the occurrence of slope failure by the data obtained from measuring equipment and the effect of countermeasures. As a result, it was confirmed that groundwater level was generated by infiltration of rainwater and slope failure occurred. In addition, it was revealed that installation of drainage pipes has the effect of suppressing the rise in groundwater level due to the drainage effect.
