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将描述土体液化特性的Byrne简化的Martin-Finn振动孔压增量模型与修正Matasovic黏弹性本构模型相结合,以外挂子程序的形式,嵌入到ABAQUS软件中,实现了可液化地基孔压增长过程的数值模拟。以简单应力状态下的可液化地基为例,初步验证了该子程序的动力有效应力分析能力;对某液化场地进行了二维非线性的总应力法和有效应力法对比分析,给出了地表加速度和地表加速度反应谱的对比结果,同时给出了代表性单元的剪应变时程曲线。结果表明,该子程序能够较好地模拟液化场地的振动孔压发展过程,预测场地的地震液化趋势。
The Byrne simplified Martin-Finn vibration pore pressure incremental model describing the liquefaction characteristics of the soil was combined with the modified Matasovic viscoelastic constitutive model to embed it into the ABAQUS software in the form of a plug-in subroutine to realize the liquefiable subgrade pore pressure Numerical simulation of growth process. Taking the liquefiable ground under simple stress condition as an example, the dynamic and effective stress analysis capability of this subroutine is preliminarily verified. By comparing the two-dimensional nonlinear total stress and effective stress method for a liquefied site, Acceleration and surface acceleration response spectrum comparison results, at the same time, the representative of the unit shear strain curve. The results show that the subroutine can simulate the development of the vibration pore pressure in the liquefied site and predict the liquefaction trend of the site.