极端海况下岛礁岸坡渗流及动力稳定性分析  

Seepage-dynamic Coupling Effect and Slope Stability Analysis of Reclaimed Coral Reef Islands Under Extreme Marine Conditions

作　　者：荣泽 年廷凯[1] 张浩 郑德凤[2] 付崔伟 RONG Ze;NIAN Tingkai;ZHANG Hao;ZHENG Defeng;FU Cuiwei(State Key Laboratory of Coastal and Ofshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;Liaoning Key Laboratory of Physical Geography and Geomatics,Liaoning Normal University,Dalian,Liaoning 116029,China;China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an,Shaanxi 710043,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,辽宁大连116024 [2]辽宁师范大学自然地理与空间信息科学重点实验室,大连116029 [3]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《水利与建筑工程学报》2022年第6期39-45,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51879036,52079020,42077272);辽宁省兴辽英才计划项目(XLYC2002036)。

摘　　要：台风巨浪及海底强震等极端海况会诱发岛礁岸坡失稳,进而造成吹填体滑塌、上部基础设施破坏等链生灾害问题,因此研究岛礁地形下岸坡渗流及动力稳定性十分重要。以南海吹填岛礁典型护岸边坡工程作为研究对象,首先利用有限元法求解台风海况下有无护岸的岛礁岸坡内部渗流场,进而考虑极端地震动力荷载,发展渗流及动力作用下岛礁岸坡的动应力场和孔压场;最后基于极限平衡法,讨论有无护岸的岛礁岸坡在渗流和动力荷载条件下的整体和局部稳定性。通过极端海况下大量数值计算结果的横、纵向对比分析发现,护岸防波堤提升了岛礁岸坡的整体稳定性,保障了吹填体的长期安全,研究成果可为同类工程建设提供参考。Extreme sea conditions such as typhoon waves and submarine strong earthquakes will induce island and reef bank slope instability,resulting in chain disasters such as blow-fill collapse and upper infrastructure damage,so it is very important to analyze the seepage and dynamic stability of island and reef slope.Taking the typical revetment slope engineering of the South China Sea dredger reef as the research object,firstly,the finite element method is used to solve the internal seepage field of the island reef slope with or without revetment under the typhoon sea condition,and then the extreme seismic dynamic load is considered.Then,the dynamic model of stress field and pore pressure field of the island reef slope under the action of seepage and dynamics was developed.Finally,based on the limit equilibrium method,the overall and local stability of the island reef slope with or without revetment is discussed under the condition of seepage and dynamic load.Through the horizontal and vertical comparison of a large number of numerical calculation results under extreme sea conditions,it is found that the breakwater improves the overall stability of the island and reef bank slope and ensures the long-term safety of the blow-fill body,and the research results can provide reference for the construction of similar projects.

关 键 词：吹填岛礁 护岸 边坡稳定性 数值模拟 渗流 

分 类 号：TU43[建筑科学—岩土工程]