ALE方法在沉箱码头地震液化分析的应用  

ANALYSIS OF THE SEISMIC LIQUEFACTION OF CAISSON WHARVES UNDER STRONG EARTHQUAKES USING THE ALE METHOD

作　　者：刘顺 唐小微[1] 栾一晓 LIU Shun;TANG Xiao-wei;LUAN Yi-xiao(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116023,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,大连116023

出　　处：《工程力学》2022年第5期177-187,共11页Engineering Mechanics

基　　金：国家重点研发计划项目(2021YFB2600703);国家自然科学基金重点项目(51639002)。

摘　　要：沉箱码头作为一种常用的结构形式,在地震荷载作用下由于地基液化可能发生沉降、倾斜等灾害形式。在强震作用下,传统有限元方法可能由于液化大变形导致网格畸变而不能正确反映沉箱码头的地震响应。基于算子分裂技术,该文发展了一种适用于饱和砂土液化大变形分析的ALE有限元方法并将其用于两种地基处理形式的沉箱码头在三种地震荷载作用下的地震液化分析。结果表明:强震作用下,ALE方法能够提供精度可靠的沉箱码头地震响应并保证整体的网格质量;沉箱的残余位移与地震荷载峰值近似呈线性关系,且对低频地震荷载较为敏感;在置换区和回填区存在高孔压连通区,可能会加大沉箱码头的残余位移,可考虑设置阻断置换区和回填区孔压转移的措施。As a commonly used port structure, caisson wharves may undergo translation, settlement, tilting and other disasters due to sand liquefaction under seismic loads. The conventional finite element method may not correctly reflect the seismic response of caisson wharves due to the distortion of the grid caused by the liquefaction deformation under strong earthquakes. Based on the operator splitting technique, this paper develops an ALE finite element method for the dynamic liquefaction analysis of caisson wharves with two types of foundations under three types of seismic loads. The results show that the ALE method provides accurate and reliable seismic response of the caisson wharves under strong earthquakes and ensures the overall grid quality.The residual displacement of caisson is linearly related to the peak seismic load and more sensitive to lowfrequency seismic loads. The high pore pressure connecting regions between the replaced region and backfill region may increase the residual displacement of the caisson wharves. Measures should be considered to block the pore pressure transfer channel.

关 键 词：有限元 任意拉格朗日欧拉方法(ALE) 沉箱码头 地震 砂土液化 

分 类 号：U656.111[交通运输工程—港口、海岸及近海工程]