波浪荷载作用下桩周土体孔隙水压力试验研究

Laboratory Study of Wave-Induced Pore Pressures Around the Pile

基于改造的圆筒试验设备,通过加载装置控制模型土体上方的波压力,实现对波浪荷载作用下的桩周土体响应试验的模拟.研究不同的波浪周期、波压力和土体相对密实度等参数对桩周土体孔隙水压力的影响;分析试验中土体孔隙水压力最大振幅值随深度的变化情况以及液化情况.结果表明:较小的波浪周期、波压力会使土体内孔隙水压力最大振幅值随深度衰减得更快;桩底附近的土体内孔隙水压力出现突然增大现象,即出现桩端孔压放大效应;波浪周期、波压力等对桩端孔压放大效应的影响较大.

Based on the modified cylinder test equipment,the wave pressure is controlled by the loading device to simulate the response of the soil under wave loading.The effects of different wave periods,wave pressure,and soil relative density on the pore pressure around the pile are studied.The maximum amplitude of the pore pressure and the liquefaction of the seabed are analyzed.The results show that the smaller wave period,wave pressure and permeability make the maximum amplitude of pore water pressure attenuates more quickly.The pore pressure in the seabed soil near the pile bottom suddenly increases.The effect of wave period,wave pressure and permeability on the pore pressure is great.