基于PL-Finn模型的饱和砂土液化数值分析

发布时间：2018-06-30 02:44

本文选题：沉箱式码头 + 动载荷　；参考：《辽宁工程技术大学学报(自然科学版)》2017年07期

【摘要】：为研究地震作用下沉箱式码头的砂土液化特征,基于包含动孔压上升的PL-Finn模型,结合现场实测和大型有限差分软件FLAC~(3D),采用完全非线性的动力分析方法,同时考虑地震动载荷与渗流的耦合作用,对置换砂和回填砂土的超孔压比进行了分析,并将现场实测结果与有限差分模拟结果进行对比分析.结果表明:码头最大水平残余位移为3.47 m,最大残余沉降为1.86 m;回填砂土在地震动载荷施加第6~9 s时已经发生了液化,且超孔压比接近1;置换砂土基本没有发生液化现象,残余超孔压比稳定在0.25~0.30;模拟计算所得的沉箱沉降量比现场实测值低7%,即有限差分模拟结果与实测数据基本吻合,认为采用FLAC~(3D)有限差分方法可以很好地模拟地震砂土液化过程.
[Abstract]:In order to study the characteristics of sand liquefaction in a box wharf subjected to seismic action, a fully nonlinear dynamic analysis method is adopted based on the PL-Finn model, which includes dynamic pore pressure rise, combined with the field measurements and the large-scale finite-difference software FLAC3D. At the same time, considering the coupling effect of seismic load and seepage, the super-pore pressure ratio of displaced sand and backfill sand is analyzed, and the field measured results are compared with the results of finite difference simulation. The results show that the maximum horizontal residual displacement of wharf is 3.47 m, the maximum residual settlement is 1.86 m, the liquefaction of backfill sand has taken place at the 6th second of seismic load, and the super-pore pressure ratio is close to 1, and there is basically no liquefaction of the replaced sand. The residual super-pore pressure ratio is stable at 0.25 ~ 0.30, and the calculated settlement of caisson is 7% lower than the actual measured value, that is, the results of finite difference simulation are in good agreement with the measured data. It is considered that the FLAC3D finite-difference method can be used to simulate the liquefaction process of seismic sand.
【作者单位】：辽宁工程技术大学土木与交通学院;
【基金】：高等学校博士学科点专项科研基金联合项目(20112121110004)
【分类号】：U656.1

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