堤坝边坡地震反应数值模拟平台与计算方法  

Numerical platform and analysis of seismic response of three-dimensional slope

作　　者：冯志仁[1,2] 唐亮[1,3] 凌贤长[1] 丛晟亦 巨能攀[3] 黄润秋[3] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150090 [2]中国地震局工程力学研究所,黑龙江哈尔滨150090 [3]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《世界地震工程》2015年第4期128-134,共7页World Earthquake Engineering

基　　金：国家自然科学基金项目(51578195;51378161);地质灾害防治与地质环境保护国家重点实验室项目(SKLGP2013K011);黑龙江省应用技术研究与开发计划项目(GZ13A009)

摘　　要：首先,介绍了基于Open Sees独立开发的一套边坡地震反应与稳定性分析三维有限元计算软件Slope SAR;借助该计算平台建立了均质黏土边坡三维有限元动力分析模型。模型中选用土的多屈服面弹塑性本构模型模拟黏土的动力属性,沿振动方向的人工截断边界使用我们提出的动力自由场边界处理;据此,在模型基底输入El Centro地震波进行边坡地震反应分析。基于此,进一步讨论了坡顶局部负载与输入地震动特性对边坡地震响应的影响。结果表明,边坡对输入的地震动沿坡面起到放大作用;随着局部均布荷载长宽比逐渐增大,边坡地震响应以局部负载与地震动共同控制为主;边坡对输入地震动的低频分量存在放大作用,且对处于边坡自振频率附近的地震波放大作用特别明显;输入地震波特性对坡肩加速度傅氏谱峰值影响不大。应该说,Slope SAR有助于进一步开展各类边坡地震反应规律及失稳机制的研究。A three-dimensional finite element software based on OpenSees, SlopeSAR, which is independently de- veloped and can conduct the seismic response and stability analysis of slope, is introduced. A three-dimensional fi- nite element dynamic analysis model for one homogeneous clay slope is established with the aid of this computing platform. The multi-yield surface elastic-plastic constitutive model is chosen to simulate the dynamic properties of clay soil, The free field boundary proposed by the authors is used to simulate the artificial truncation boundary along the direction of vibration. On this basis, E1 Centro earthquake wave is input on the slope model to conduct the seis- mic response analysis. The effect of local surcharge on the slope top and the characteristics of input motions on the seismic behaviors of slope are discussed. It shows that the input seismic waves are influenced by surface amplifica- tion of the slope. The earthquake response of slope is controlled by local load and ground motion along with the in crease in length/width ratios of local uniformly distributed load. The slope amplifies the input seismic waves with low frequency, especially when the frequency of seismic waves is near the natural vibration frequency of slope. The characteristic of input motions do little affect the oeak of Fourier soectra of acceleration for slooe shoulder. It iustifvthat SlopeSAR is contributed to further researches on the law of slope seismic response and the mechanism of slope instability for many kinds of slopes.

关 键 词：边坡 三维非线性有限元分析 动力响应 地震 

分 类 号：TU43[建筑科学—岩土工程]