Foundation structures are structures that resist earth pressure or use earth pressure, and many of them have been constructed. For this reason, studies on earth pressure have been conducted for a long time, and practical formulas have been proposed. However, it is relatively difficult to measure the soil pressure, and the comparison between the design value and the measured value is insufficient. Experimentally, most of the cases measured the resultant force or stress distribution perpendicular to the wall surface. Not enough.
　Therefore, we conducted soil pressure experiments using a two-component force meter that can simultaneously measure the vertical and shear loads acting on the wall surface, and investigated the changes in the wall friction wall caused by the movement of the wall. We investigated whether it was working. As a result, the following conclusions were obtained.
(1) The wall friction coefficient is almost constant in the depth direction in the static and active states. In this experiment, it seemed that the frictional force was almost completely exerted in these conditions.
(2) When the wall rotates around the bottom end and changes from the rest state to the passive state, the passive state is reached from the top of the wall. When the passive state is reached, the upper friction coefficient is almost constant. The wall normal stress coefficient in the passive state at this time showed good correspondence between the measured values ​​and the theoretical values.
(3) When the wall changes from rest to passive state while rotating around the bottom edge, the magnitude and direction of the frictional force acting on the wall change. At this time, the way of change differs depending on the difference in the maximum friction coefficient of the wall surface.
(4) The relationship between wall normal stress and displacement occurring at each depth of the wall in the process of reaching the passive state is nonlinear. In addition, this wall normal stress seems to be affected by the wall friction coefficient.