液化场地地震反应的离散元数值模拟  

Numerical simulation of earthquake response for liquefiable site using discrete element method

作　　者：刘洋[1] 孔戈[2] 周健[2] 

机构地区：[1]北京科技大学土木与环境工程学院土木系,北京100083 [2]同济大学地下建筑与工程系,上海200092

出　　处：《地震工程与工程振动》2011年第1期155-160,共6页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金资助项目(50808016)

摘　　要：采用一个描述饱和砂土中固相颗粒和液相流体耦合的离散元数值模型,固相颗粒采用离散元的颗粒流理论(PFC)模拟,液相流体通过求解平均Navier-Stokes方程的计算流体动力学(CFD)技术计算。采用上述模型数值模拟了在地震荷载作用液化场地的加速度、剪应力、剪应变时程以及超孔隙水压力和土层表面位移的发展过程。数值模拟结果表明,采用的DEM模型可以用于液化场地的地震反应分析。A fluid-particle coupled discrete element model was adopted to simulate the earthquake response of liquefiable site.Particles were simulated by PFC,while fluid was simulated by solving the average Navier-Stokes equations.The evolution of macro parameters were analyzed,such as acceleration,shear stress and shear strain.The accumulation and dissipation of excess pore water pressure and settlement of ground surface were also simulated with this method.The numerical results indicate that the adopted DEM model could simulate earthquake response for liquefiable site effectively.

关 键 词：液化场地 地震反应 离散单元法 数值模拟 

分 类 号：TU441.4[建筑科学—岩土工程]