高桩码头软土岸坡蠕变的MCDM加固效果分析  

Research on the reinforcement of pile-supported wharf using MCDM method under the creep effect

作　　者：蒋昕峄 董胜[1] 焉振[2] JIANG Xin-yi;DONG Sheng;YAN Zhen(College of Engineering,Ocean University of China,Qingdao 266100,China;Tianjin Research Institute for Water Transport Engineering,Tianjin 300456,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100 [2]交通运输部天津水运工程科学研究院,天津300456

出　　处：《海洋湖沼通报》2021年第6期74-82,共9页Transactions of Oceanology and Limnology

基　　金：国家自然科学基金委员会-山东省人民政府联合基金项目(U1706226)。

摘　　要：土体蠕变使高桩码头软土岸坡发生随时间增长的变形,导致高桩码头桩基侧向位移。在ABAQUS平台建立软土岸坡-码头排架三维有限元模型,研究m型混凝土深层搅拌(MCDM)体对软土岸坡蠕变导致的桩基应力及变形的加固效果。结果表明:MCDM加固法对堆载作用与蠕变作用的加固效果差异明显;给定工况下,MCDM法能有效降低软土岸坡蠕变下桩基内力并大幅减少码头存在的应力集中,桩体的最大压应力明显降低,幅度达94%,桩体最大拉应力削减了12%;岸坡土体蠕变作用下,MCDM体受压性能显著,底部拉应力变大;MCDM体加固后,近岸侧基桩在岸坡土体蠕变作用下的位移明显减小,弯矩最大值变小,近海侧的基桩位移减小,但弯矩变化不大;MCDM体存在最优加固深度,随加固腿长增加,桩体最大拉应力持续降低。The soft soil bank slope of pile-supported wharf deforms with time because of creep,resulting in the lateral displacement of piles.A slope-wharf three-dimensional finite element model was established on ABAQUS platform to investigate the reinforcing effect of MCDM body under creep.The results show that there is a big difference between the effects of MCDM method under creep and uniform load.Under giving conditions,MCDM method can effectively reduce pile stress and significantly reduce stress concentration,and the compressive stress caused by creep is decreased about 94%with the effect of reinforcement.The tensile stress caused by creep is only reduced by 12%.MCDM body mainly undertakes compressive stress,and tensile stress at the bottom of MCDM body gets larger with the effect of creep.The displacement of shore side pile caused by creep is obviously reduced because of MCDM method and the maximum bending moment is reduced.On the other side,with the effect of MCDM body,the displacement of seaside pile is also reduced but the bending moment changes little.MCDM body has optimal reinforcement depth,and the maximum principal stress of pile decreases with the increasing of length of MCDM body.

关 键 词：高桩码头 岸坡变形 MCDM 蠕变 有限元 

分 类 号：U656.113[交通运输工程—港口、海岸及近海工程] TB115[交通运输工程—船舶与海洋工程]