摘要
针对斜坡式防波堤结构在地震作用下的结构变形和安全性评估问题,本文基于广义弹塑性本构模型,采用有限元方法开展针对粉细砂地层防波堤结构在运行安全地震和极限安全地震下的动力响应情况分析研究,研究得到的主要结论如下:模型计算结果中软土地基的地面加速度峰值相比地表基岩的放大系数达到1.4,符合规范中对场地类型的划分;在运行安全地震作用下,粉细砂层液化概率小于0.3,且均分布在防波堤结构以外的地表。防波堤在地震过程中的整体抗滑安全系数最小值为1.25,满足规范对结构安全的要求;在极限安全地震作用下,粉细砂层液化概率达到0.75,液化区域主要出现在港池内侧堤脚位置,对应的湾内侧最大水平位移达到0.9m,海侧最大水平位移达到0.25m,最大竖向位移达到0.85m,防波堤变形不影响结构功能发挥,可以满足变形限制要求。
In response to the structural deformation and safety evaluation of sloping breakwater under earthquake action.Based on the generalized elastic-plastic constitutive model,finite element method is used to analyze the dynamic response of breakwater structures in fine sand under OSE and SSE conditions.The main conclusions obtained from the study are as follows:the amplification factor of the ground peak acceleration in the soft soil foundation compared to the PGA reaches 1.4,which is in line with the classification of site types in the specifications;Under the OSE condition,the liquefaction probability of the fine sand layer is less than 0.3,which is distributed on the surface outside the breakwater.The minimum overall anti-skid safety factor of the breakwater during earthquake is 1.25,which meets the requirements of the code for structural safety;Under SSE condition,the liquefaction probability of the fine sand layer reaches 0.75,and the liquefaction area mainly occurs at the foot of the embankment on the inner side of the bay,the corresponding maximum horizontal displacement on the inner side of the bay reaches 0.9 m,on the sea side reaches 0.25 m,and the vertical displacement reaches 0.85 m.The deformation of the breakwater does not affect the functional performance of the structure and can meet the deformation limit requirements.
作者
于洋
孙治林
刘良志
陈少青
程林
Yu Yang;Sun Zhilin;Liu Liangzhi;Chen Shaoqing;Cheng Lin(CHN Energy HuangHua Port Co.,Ltd.,Cangzhou Hebei 061113,China;Tianjin BeiYang Survey and Design Institute of Water Transport&Water Conservancy Co.,Ltd.,Tianjin 300452,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China)
出处
《港口航道与近海工程》
2024年第4期53-58,共6页
Port,Waterway and Offshore Engineering
关键词
斜坡式防波堤
有限元模型
粉细砂液化
变形计算
Sloping Breakwater
Finite Element Model
Liquefaction of Fine Sand
Deformation Calculation
