淤泥海砂混合料海堤地震动力响应数值模拟

Numerical Simulation of Dynamic Response of Seawall with Subsea Sand-silt Mixture

为了分析淤泥海砂混合料在加速度、震后位移、液化破坏情况和稳定性等方面的动力响应,探讨混合料作为海堤填料的可行性下的可行性,将淤泥与海砂进行混合,制备了淤泥海砂未固化混合料,又掺入水泥制备固化混合料,用于分析地震作用下海堤的动力响应。通过有限元软件Geo-studio分析地震荷载作用下海堤的动力响应,结果表明:采用未固化混合料填筑的海堤在地震作用下的稳定安全系数不能满足规范要求;而固化混合料填筑的海堤,能够减小海堤在地震作用过程中产生的加速度、液化破坏范围和震后永久位移,并且海堤在静力状态和地震荷载作用下均能够满足规范规定的稳定性要求。因此,淤泥海砂混合料填筑海堤在抗震设计方面是可行的。

To analyze the dynamic response of the subsea sand-silt unsolidified mixtures in terms of acceleration,post-earthquake displacement,liquefaction failure and stability and discuss the feasibility of the mixture as a seawall filling material,subsea sand-silt unsolidified mixtures were prepared by mixing silt and subsea sand,and cement was added to prepare solidified mixture to analyze the dynamic response of coastal levee under seismic load.Using the finite element software Geo-studio,the dynamic response of coastal levees with seismic load was studied.The results show that the stability safety factor of coastal levee filled with unsolidified mixtures cannot meet the requirements of the standard under seismic load,while the coastal levee filled with solidified mixture can reduce the acceleration amplitude,liquefaction damage range and permanent displacement of the coastal levee.And the coastal levee can satisfy the demands of stability under static and seismic load.Therefore,it is feasible to fill seawall with silt and sand mixture in seismic design.