Abstract
The measurement of pore-water pressure using tensiometers has been carried out to clarify seepage behavior in the ground until now. The value of measurement using tensiometers includes the influence of pore water pressure and pore air pressure. However, since it is assumed that pore air pressure is at 0 kPa of gauge pressure, effect of pore air pressure is not considered. Several studies have proved that increase of pore air pressure in the ground have influence on slope failure, rainfall infiltration, and so on. In this paper, we have measured the pore air pressure in the ground to investigate behavior of pore air pressure under different rainfall intensity and boundary conditions during rainfall infiltration. As a result of the experiments, increase of pore air pressure is observed under flood conditions at surface of the ground, and the necessity of measurement pore air pressure is shown.
