深水防波堤软土地基数值模拟  

Numerical modeling of deepwater breakwater on soft soil foundation

作　　者：葛栋林 徐宾宾[2] 解林博[2] 潘良鹄 GE Dong-lin;XU Bin-bin;XIE Lin-bo;PAN Liang-hu(Naval Research Academy,Beijing 100070,China;Tianjin Port Engineering Institute Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]海军研究院,北京100070 [2]中交天津港湾工程研究院有限公司,天津300222

出　　处：《水运工程》2020年第9期167-172,195,共7页Port & Waterway Engineering

摘　　要：某深水防波堤为斜坡式结构,水深18~30 m,软土层厚度超过30 m,基础采用部分开挖换填方式,基底保留了10余米原状软土层,地基沉降较大。为准确预计竣工后地基沉降,预留堤顶沉降以满足堤顶高程的设计要求,采用数值方法研究深水防波堤深厚软土地基沉降变形和稳定性。在利用施工期水下地基监测获得的大量实测数据验证数值模型真实可信的基础上,模拟防波堤的开挖和抛填施工及长期沉降全过程,得到各典型断面的最终沉降、施工期沉降和竣工后沉降,可为堤顶预留竣工后沉降及后期防波堤维护提供参考。同时,利用该模型进一步复核了防波堤地基的安全稳定性。A deepwater breakwater is a sloping structure with water depth of 18 ~ 30 m and soft soil layers of more than 30 m thick. The foundation is partially excavated and replaced,and the original soft soils of more than 10 m are retained in the foundation,resulting in a large settlement of the foundation. In order to accurately predict the foundation settlement after construction and reserve the settlement to meet the design requirements of the breakwater’ s top elevation,we study the settlement deformation and stability of deep soft soil foundation of deepwater breakwater by numerical method. Under the prerequisite that the numerical model is verified trustworthy by a lot of measured data obtained from underwater foundation monitoring during construction,we simulate the whole process of excavation,dump filling and long-term settlement of the breakwater,and obtain the final settlement, construction period settlement and post-construction settlement of each typical section,which could be used as reference for reserved post-construction settlement of the breakwater top and breakwater maintenance in the later period. Meanwhile,the model is also used to further check the safety and stability of the breakwater foundation.

关 键 词：深水防波堤 软土地基 水下地基监测 地基数值模拟 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程] U656.2[交通运输工程—船舶与海洋工程]