重力式擁壁に作用する振動土圧について
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概要
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This report presents many considerations about measured oscillating earth pressures acting on a test wall of gravity type which is shaken by artificial earthquakes caused by a large vibration generator, or which is shaken by a small vibration exciter fixed on the top of the wall. The earth pressures on the back and bottom surfaces of the wall were measured by a number of specially developed pressure cells, and also the vibration of the wall by vibration pick-ups. The measured oscillating earth pressures acting on the back of the wall, and displacements of it can be represented by rotating vectors which are arranged horizontally around a vertical axis of rotation. A curve generated by connecting the points of pressure vectors is generally a spatial curve. When the spatial curve rotates, the orthogonal projection of it on a vertical plane shows the vertical distribution of oscillating earth pressure acting on the back of the wall. In order to express the spatial curve of pressure mathematically, two projections on xz-and yz-planes are formulated as follow. P_x=A_x(z-z_x)^n+B_x(z-z_x)+p^^-_x P_y=A_y(z-z_y)^n+B_y(z-z_y)+p^^-_y where n=3, 5, 7. By these equations, the vertical distributions of oscillating earth pressure have been fully revealed. Now, we can satisfy the equations of motion of the wall assuming that the vertical oscillating earth pressures acting on the bottom distribute parabolically in the longitudinal direction of the wall. The fact that the measured pressures and displacements fulfil the equations of motion of the wall makes the investigation of the mechanical model of the wall during vibration possible. Many qualitative considerations between forces and displacements are described, which may be useful in the investigation of the mechanical model of a gravity wall.
- 独立行政法人 海上技術安全研究所の論文
- 1971-09-30
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