波浪荷载对码头桩基竖向承载力的影响研究  

Influential Study on Wave Loading to Vertical Bearing Capacity of Wharf Pile Foundation

作　　者：袁伟[1] 闫澍旺[1] 赵亮[1] 

机构地区：[1]天津大学建筑工程学院,天津市300072

出　　处：《勘察科学技术》2011年第6期1-5,9,共6页Site Investigation Science and Technology

摘　　要：码头桩基在波浪循环荷载的长期作用下,桩周一定范围的土体会出现强度弱化,进而会一定程度的影响基桩竖向承载力。该文首先通过室内GDS动态三轴仪对天津港码头地基土样作用模拟的波浪循环荷载,研究不同深度土体受到不同幅值的循环动应力荷载作用后其强度的折减规律。然后通过ABAQUS有限元软件计算模拟码头桩基在上部既有结构相互作用的同时,桩身上部受波浪循环荷载,桩周土动应力的分布规律。结合室内动三轴试验结果,计算得到该码头桩基在波浪循环荷载作用下桩周土体弱化的影响深度约为5m,桩周土体的强度折减率最大达到85.3%,码头桩基竖向承载力的折减率为5.73%。The soil around pile foundation in the wharf will suffer from strength reduction under the cycle wave loading conditions,which would further influence the vertical bearing capacity of the pile foundation.Through the indoor dynamic triaxial GDS to simulate the cycle wave loading and apply these loads to the soil sample of Tianjin port,the strength reduction laws of soil under the dynamic cycle loads in different depths are obtained.Next,with the help of ABAQUS,combining the working loads with cycle wave loading on the pile foundation,the distribution laws of soil dynamic stress around the pile are analyzed.After synthesizing the dynamic triaxial test,the final results are obtained,which show the soil suffered from strength reduction spreads to the depth up to 5 m,the maximum strength reduction rate nearby soil can reach 85.3% and the vertical bearing capacity of wharf pile foundation reduction rate is 5.73%.

关 键 词：桩基 波浪荷载 动三轴试验 ABAQUS 竖向承载力 

分 类 号：U656.1[交通运输工程—港口、海岸及近海工程] U655.55[交通运输工程—船舶与海洋工程]