地震作用下高桩码头岸坡整体稳定性拟静力分析  

Pseudo-static analysis of overall stability of slopes of high pile wharves subjected to earthquakes

作　　者：张家瑞 刘先林 吕龙[3] 邵羽 吕玺琳[1,4] ZHANG Jiarui;LIU Xianlin;LÜLong;SHAO Yu;LÜXilin(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Guangxi Communication Design Group Co.,Ltd.,Nanning 530029,China;Chengdu University of Technology,Chengdu 610059,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]广西交通设计集团有限公司,广西南宁530029 [3]成都理工大学,四川成都610059 [4]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩土工程学报》2024年第S02期205-209,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目(2021YFB2600700);广西科技重大专项(2022AA15001)。

摘　　要：高桩码头是一种常见的沿海水工建筑物,在强震作用下码头岸坡可能产生较大的侧向位移乃至整体失稳。采用极限分析上限法,从拟静力角度分析地震作用下高桩码头岸坡的整体稳定性。将码头排桩对岸坡的稳定作用简化为梯形分布力,采用对数螺旋破坏机制推导出临界地震系数理论公式,并通过优化分析确定临界地震系数的最小上限解和对应的临界破坏面。通过具体算例分析,将提出的理论方法与有限元极限分析结果对比,验证了其合理性。进一步地,结合强度折减法,研究了排桩布置和土体强度变化对地震作用下岸坡稳定性和破坏模式的影响规律。The pile-supported wharf is a common type of coastal structures,and the slope of pile-supported wharf may experience the overall instability and large lateral deformation during earthquakes.The upper bound limit analysis method is used to assess the pseudo-static stability of a slope of the pile-supported wharf.The stability effects of pile rows on the slope is simplified to a trapezoidal distributed force,the critical seismic coefficient is derived using the log-spiral failure mechanism,and the minimum upper bound solution for the critical seismic coefficient and the corresponding critical slip surface are determined through optimization.To verify the rationality,the results obtained from the proposed method and the finite element limit analysis are compared through a specific exmple.Furthermore,combined with the strength reduction method,the influences of row-pile arrangement and soil strength on the seismic stability and failure mechanism of the slope are obtained.

关 键 词：高桩码头 边坡稳定性 地震 极限分析 

分 类 号：TU432[建筑科学—岩土工程]