【摘要】 将依据动三轴试验建立的饱和南京细砂孔压增量模型三维化,嵌入到基于ABAQUS软件开发的修正的Davidenkov黏弹性本构模型模块中,以外挂FORTRAN子程序的方式,完成三维振动孔压增量模型在ABAQUS软件中的二次开发。对简单应力状态和复杂应力状态下的可液化地基进行数值模拟,初步验证该外挂子程序的有效应力分析能力及可靠性,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,能合理地反映场地的地震液化特性和有效应力变化规律,预测场地的地震液化趋势。更多还原

【Abstract】 A three-dimensional incremental model is created for dynamic pore water pressure(DPWP) obtained from dynamic triaxial test of saturated Nanjing fine sand.Then,this model is embedded into a three-dimensional Davidenkov viscoelastic constitutive model in ABAQUS.The secondary development of three-dimensional DPWP incremental model was achieved by executing FORTRAN subroutine.After simulating the liquefiable foundation soils under both simple and complex stress conditions,the FORTRAN subroutine is proved to be reliable and capable of analyzing effective stress.It shows that the subroutine can be used to simulate the development of DPWP in liquefiable site.In addition,the subroutine can reflect the liquefaction features and the variation of effective stress,as well as predict the liquefaction trends.更多还原