Deformations of steel cylinder revetment structures under water pressures and wave loads

The centrifugal model tests are conducted to investigate the stress and deformation characteristics of large-diameter steel cylinder revetment structures under water pressures and wave loads. The displacements and rotation angles of the cylinders under coupled loads are analyzed, and the flow mechanism of the soils is analyzed using the PIV technology. The test results show that during the excavation construction period, the pore pressures of the soils increase rapidly, and after excavation is completed, it gradually tend to be flat. However, the variation of the pore pressures has a hysteresis, and the pore pressures of the soils can only remain stable after a period of time after excavation is completed. As the excavation construction progresses, the cylinders rotate towards the land side, with the fastest rotational speed during excavation. After the excavation is completed, the angle change gradually slows down, with the maximum angle of 0.32 ° and the maximum horizontal displacement of 358 mm towards the land side. Under the influences of the rotation of the cylinders, significant horizontal displacements occur in the foundation soils, but when the distance from the cylinders exceeds 30 m, the displacements of the soils are relatively small and negligible. Overall, the displacements and deformations of the cylinders during the construction period are relatively small, and there is no overturning or obvious sliding failure, indicating that the use of the steel cylinder structures can meet the engineering requirements.