摘要
基于块石静、动室内三轴试验确定的广义塑性模型参数,对直立墙结构振动台试验进行有限元数值模拟,并与试验结果进行对比分析,进一步探讨直立墙结构在地震荷载作用下的破坏过程和破坏特征。计算表明:该模型可较合理地模拟直立墙结构的地震反应特性和破坏特征,计算结果与试验现象基本相符。位于抛石基床上的直立墙结构破坏模式为直立墙向外海侧的滑移、倾斜和竖向沉降,其破坏过程为:当输入加速度较小时,直立墙处于稳定状态;随着输入加速度逐渐增大,直立墙在自身惯性力和墙后回填块石的动土压力作用下缓慢向外海侧水平滑移、倾斜和竖向沉降,墙后回填块石出现沉陷,但变形较小;当加速度达到一定值时,直立墙向外海侧移动和回填块石沉陷速率急剧增加,变形较大。
Based on calibrated parameters of the generalized plastic model of gravel material ap-plied to static and dynamic triaxial experiments,a numerical simulation of the shaking table test for a vertical wall structure is performed.The experimental and numerical results are compara-tively analyzed to further study the failure process and failure characteristics of vertical wall structures under earthquakes.Results show that the numerical model could simulate the earth-quake response and failure characteristics of the vertical wall structure.The failure mode of the vertical wall structure located in gravel foundation is a seaward horizontally slip,tilt,and settle-ment of the vertical wall.The failure process of the vertical wall structural was found to be as fol-lows：when the input acceleration is small,the vertical wall is in a steady state;with the gradual increase of the input acceleration,the vertical wall starts to horizontally slip and incline and back-fill gravel appear under the action of the seismic inertia force and dynamic earth pressures,but the displacement is small.When the acceleration reaches a certain value,the movement speed of the vertical wall and subsidence rate of the backfill gravel increase dramatically and the vertical wall structure exhibits significant deformation.
出处
《地震工程学报》
CSCD
北大核心
2016年第3期333-337,352,共6页
China Earthquake Engineering Journal
基金
地震行业科研专项经费项目(201208013)
国家自然科学基金项目(51138001
51508071)
关键词
直立墙
广义塑性模型
振动台试验
有限元分析
vertical wall
generalized plastic model
shaking table test
finite element analysis
