水平荷载作用下刚性桩桩土相互作用弱化规律和分布模式研究OA

Offshore wind power is currently developing very rapidly in China,and the installed capacity of offshore wind power in China will reach 50 GW in the 14th Five-Year Plan.Super large-diameter monopile foundation is one of the most common forms foundation,widely used in offshore wind farms in the world,accounting for 75 percent of the built offshore wind farm foundation.At present,the influence of horizontal load on the vertical bearing capacity of pile foundation has been rarely studied.The soil pressure level around the piles is one of the key factors affecting pile side friction resistance.To investigate the offshore super large-diameter monopile foundation's lareral bearing behavior,a series of 1 g model tests were carried out for a rigid pile in silt,and the pile-soil weakening effect and distribution law along the pile were analyzed under lateral load.The expression of the soil pressure-deformation is established,and the distribution model of soil pressure along the pile shaft under lateral load is proposed.The test results reveal that the soil pressure in the active zone gradually decreases and that in the passive zone increases slightly with the increase of the cyclic number under horizontal cyclic load.After horizontal deformation of the pile,the soil pressure change in the active region can be divided into three phases:the sharp decline phase,the slow decline phase and the stable phase,and according to the soil pressure acting on the pile,there are three areas along the pile body:detachment zone,weakening zone and stabilizing zone.