地震作用下板桩码头结构动力响应研究  

Dynamic response of sheet pile wharf under seismic loads

作　　者：孙鹏[1] 肖骏[1,2] 欧阳峰[1] 吕慧[1] 

机构地区：[1]河海大学港口海岸与近海工程学院,南京210098 [2]浙江省交通规划设计研究院,杭州310006

出　　处：《水道港口》2016年第5期530-535,共6页Journal of Waterway and Harbor

摘　　要：为探究地震作用下板桩码头结构动力响应,采用有限元软件ABAQUS建立了板桩码头二维有限元模型,对板桩码头进行了地震动力响应数值分析,研究了板桩墙入土深度对码头结构地震动力响应的影响及地震作用下的板桩墙后动土压力分布规律。研究表明:(1)板桩墙底部达到嵌固状态后,板桩入土深度的增加对于板桩墙的稳定性没有改善,反而小幅度增加了板桩顶位移及拉杆拉力;(2)地震模拟过程中的表层砂土动土压力较规范计算值偏大,其原因是板桩墙上部受到拉杆的约束作用及板桩墙自身变形,使表层砂土的动土压力更接近于动被动土压力,而在规范计算方法中表层砂土按照动主动土压力计算,表层砂土动土压力计算仍有待进一步完善。To investigate the dynamic response of sheet pile wharf under seismic loads,a two-dimensional fi-nite element analysis was carried out by using ABAQUS. The dynamic response of sheet pile wall with differentsheet pile insert depth and the distribution of soil pressure of sheet pile under seismic loads were studied. It showsthat with the increasing insert depth of the sheet pile,the stability of the sheet pile wall is not improved when thebottom of the sheet pile is embedded. Instead,the displacement of the sheet pile wall at the top end and the stress ofthe pull rod slightly increase. In addition,the soil pressure on the surface sand layer under seismic loads is largerthan the value calculated by using the formula in the code. This can be attributed to the fact that the surface sandlayer is actually in the passive conditions due to the restriction effects of the rod and the deformation of the sheetpile. However,in the code,the soil pressure on the surface sand layer is calculated by using the active soil pressureformula. All these show that the calculation method presented in the code need to be modified.

关 键 词：板桩码头 地震动力响应 入土深度 动土压力 ABAQUS 

分 类 号：TU432[建筑科学—岩土工程] TU399[建筑科学—土工工程]