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饱和砂土地基在强震作用下会产生液化,导致其强度降低,并产生沉降、侧移和喷砂冒水等现象。基于YANG Zhao-hui提出的砂土液化本构模型,采用OpenSees对饱和砂土场地的地震反应进行了非线性动力有限元分析,阐述了液化机理以及对地基的作用;通过改变土性、地震动幅值、持时、频率等因素后数值模拟的对比,分析了各因素对可液化场地地震反应的影响。结果表明,饱和松砂场地更易产生液化;大震下场地更易产生液化;长持时的地震动更易造成液化;高频和低频的地震动均不易造成液化,而存在一个最易造成液化的中间频率值。
Saturated sand foundations can liquefy under the action of strong earthquakes, resulting in the decrease of their strength and the phenomena of subsidence, lateral displacement and grit blasting. Based on the constitutive model of sand liquefaction proposed by YANG Zhao-hui, the nonlinear dynamic finite element analysis of the seismic response of the saturated sand site was carried out by using OpenSees. The liquefaction mechanism and the effect on the foundation were expounded. Amplitude, duration, frequency and other factors after the numerical simulation comparison of the impact of various factors on liquefiable ground seismic response. The results show that the liquefaction is more likely to occur in the saturated loose sand ground; the liquefaction is more likely to occur in the site under large earthquake; liquefaction is more likely to occur in the long-term ground motion; the high and low frequency ground motion are not easy to cause liquefaction, Frequency value.