摘要
箱筒型基础防波堤是一种新型防波堤结构,适用于较深水域且海底为软土地基上的筑堤情况,因其出现时间较短,迫切需要加深对其承受波浪荷载的工作性状的认识。采用拟静力法等效模拟波浪荷载对箱筒型基础防波堤作用,研制了能够在离心机高速运转条件下施加水平力荷载作动器,进行了箱筒型基础防波堤离心模型试验,观测了箱筒型基础防波堤的水平位移、沉降和倾斜以及地基中孔隙水压力等反应。结果表明,当水平荷载力大于某一临界值后,荷载位移曲线表现出类似"屈服"的现象,背浪侧和迎浪侧的地基中分别出现正的和负的超静孔压,而修建于软弱地基上的箱筒型基础防波堤主要位移破坏模式为防波堤倾斜过度而失稳。
Cylindrical breakwater is a new type of deep water breakwater which is proposed to be constructed on soft ground with severe wave loading. As it is not long before the trial section was built up, no severe storm has been encountered till now. As a result, there is a pressing need to get to know the working performance of cylindrical breakwater for establishing a procedure or code of design and construction. Therefore, centrifuge model tests were carried out to investigate the response of the cylindrical breakwater subject to pseudo-static wave load. The pseudo-static wave load was applied to cylindrical breakwater by a newly-developed loading actuator of lateral fore. It is found that there was a yielding point of deformation as the pseudo-static wave load is in excess of a certain value, and that the positive and negative excess pore water pressure were produced on the back-wave side and on the meeting-wave side, respectively. The main mode of failure to be proposed in the design of cylindrical breakwater was overturning failure of excessive tilt displacement.
出处
《中国港湾建设》
北大核心
2010年第A01期105-109,共5页
China Harbour Engineering
关键词
箱筒型基础防波堤
离心模型试验
拟静力法
波浪荷载
工作性状
cylindrical breakwater
centrifuge modeling
pseudo-staticmodeling
wave loading
working performance
