典型液化场地地震响应特征与参数敏感性分析

Analysis on Seismic Response Characteristic and Parameter Sensitivity of Typical Liquefaction Site

强地震作用下,场地土体液化提升了地基失效率,进而加剧了建(构)筑物破坏的可能性。为了更好地厘清强震作用下场地液化的主要影响参数,文章设计了一种典型的可液化场地,采用有限元方法研究了土层液化情况下场地土体的地震响应特征。进而,以地表位移和地表加速度作为评价基准,采用一次二阶矩法和龙卷风图法对其影响参数进行了较系统的敏感性分析,探究了可液化场地地震响应的主要影响参数,提出抗液化措施,并用数值证明了其可行性,为优化场地的抗液化措施奠定了基础。

Under the action of strong earthquake,the liquefaction of site soil increases the failure rate of foundation,thereby exacerbating the possibility of building(structure)damage.In order to better clarify the main influencing parameters of site liquefaction under strong earthquake,a typical liquefiable site is designed,and the seismic response characteristics of site soil under soil liquefaction are studied by finite element method.Furthermore,taking the surface displacement and surface acceleration as the evaluation criteria,the first-order second-moment method and the tornado diagram method are used to systematically analyze the sensitivity of the influencing parameters.The main influencing parameters of the seismic response of the liquefiable site are explored,and the anti-liquefaction measures are proposed.The feasibility is proved by numerical value,which lays a foundation for optimizing the anti-liquefaction measures of the site.