Abstract
Recently, torrential rainfall frequently occurs due to global climate change and it causes sediment disasters. It is difficult to predict when and where slope failure because of localization of rainfall area. Knowing precursory phenomena is effective for disaster reduction. However, some of them have not been explained in the framework of geotechnical engineering. Organic smell and strange sound, known as a precursory phenomenon of slope failure, are generated by air movement. This study focuses on pore air behavior within the ground due to rainfall infiltration. Here, rainfall infiltration to sloping ground was simulated with using the soil/water/air coupled finite element code, DACSAR-MP. Consequently, it was found out that distribution of pore air pressure is dependent on drainage condition of air and there is interinfluences between pore air behavior and rainfall infiltration behavior.
