循环波压力下软基上大圆筒防波堤数值分析  

Numerical analysis for large-diameter cylindrical breakwater subjected to cyclic wave-induced pressure in soft ground

作　　者：范庆来[1,2] 栾茂田[2] 邓建俊[1] 杨华勋[1] 

机构地区：[1]鲁东大学岩土工程重点实验室,山东烟台264025 [2]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

出　　处：《华中科技大学学报（自然科学版）》2008年第11期120-123,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50579006,50179006,50639010);鲁东大学博士科研启动基金资助项目(LY20075602);鲁东大学岩土工程重点实验室开放实验资助项目

摘　　要：基于忽略土骨架和孔隙水惯性效应的广义Biot固结理论的简化形式,采用前人提出的改进剑桥弹塑性动力本构模型以模拟软黏土在循环荷载作用下的变形、超静孔隙水压力累积效应,对于循环波压力作用下软土地基与大圆筒结构物耦合系统进行了弹塑性有效应力有限元分析,探讨了不同波高条件下大圆筒结构的不同变形模式以及失稳机理.计算结果初步表明:当波高较大时,大圆筒结构与地基耦合系统的瞬时位移较大,残余变形相对较小;而当波高较小时,大圆筒结构与地基耦合系统的残余位移相对较大.Based on simplified form of general Biot＇s consolidation theory neglecting inertia effect of soil skeleton and pore fluid, utilizing the improved Cam-clay dynamic constitutive model to simulate the accumulation effect of deformation and extra porepressure in soft clay, the elasto-plastic effective stress finite element analysis is conducted for large-diameter cylindrical structure in soft ground. The different deformation modes and failure mechanisms of instability of the soft ground-cylindrical structure coupled system subjected to cyclic wave-induced pressure with different wave height are investigated. From the results, it is indicated that when the wave height is larger, the cyclic displacement of soil-structure coupled system is higher and residual displacement is smaller, however the lower the wave height, the larger residual displacement of the structure would be.

关 键 词：软黏土地基 防波堤 循环波压力 有效应力分析 大圆筒结构 变形 失稳 

分 类 号：TU312[建筑科学—结构工程] TV64[水利工程—水利水电工程]