液化土层中单桩地震动力响应分析

地震作用时,地基土液化前后的本构模型是不同的,考虑桩土共同作用的非线性关系,利用FLAC3 D有限差分软件研究液化土层中地震荷载的大小、持续时间对单桩动力响应的影响。结果表明:地震的持续时间和强度均对砂土层的反应情况有较大影响,在持续时间相同、强度不同的地震作用下,地震强度越大,砂土层液化的范围也越大;在持续时间不同、强度相同的地震作用下,地震持续时间越长,土层发生液化的可能性越大;由于桩土动力相互作用,砂土层的液化对桩身的侧向位移影响很大,不仅影响侧向位移的大小,还影响侧移的方向。

Dynamic Response of Single Pile in Liquefaction Strata under Earthquake

Based on different constitutive models of the foundation soil before and after liquefaction and considering the nonlinear relation of pile-soil interaction,the dynamic finite difference analysis of single pile is carried out by using FLAC3D.Effects such as earthquake magnitude,duration and soil conditions on dynamic response of single pile in liquefaction strata are studied.Results show that earthquake duration and earthquake magnitude has great influence on the reaction conditions of sand layer.In case of the same earthquake duration and different earthquake magnitude,the greater the earthquake magnitude,the larger the range of soil liquefaction.In case of the same earthquake magnitude and different earthquake duration,the longer the duration of earthquake,the more probability of soil liquefaction.Due to the pile-soil dynamic interaction,Sand liquefaction has great influence on lateral displacement of pile which can affect not only the magnitude of the lateral displacement but also the direction of lateral displacement.