Application of ABAQUS in calculating deformation of excavations
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摘要: 探讨了商业有限元软件ABAQUS中多孔介质弹性模型与黏土临界状态塑性模型中有关参数的物理含义和基于常规三轴试验及压缩试验成果确定模型中参数值的方法。基于e–lnp′平面中各向等压固结线、回弹线、K0状态压缩线及临界状态线间的相关关系以及修正剑桥模型，推导了K0状态下初始孔隙比与平均主应力的相关关系，并通过子程序嵌入ABAQUS的计算中。采用ABAQUS中多孔弹性模型和临界状态塑性模型相结合的弹塑性本构关系，针对某土钉支护案例的变形进行了计算。分析了支护水平位移以及地面沉降的计算结果的合理性，验证了ABAQUS数值模拟在分析计算基坑开挖变形问题的可行性。Abstract: The physical meanings of the parameters for the porous elasticity model and the critical state plasticity model in ABAQUS, a popular commercial finite element software, are discussed, and the methods to decide the parametric values from triaxial compression tests or oedometer tests are presented. Based on the relationship among the normal consolidation line, unloading-reloading line, K0 consolidation line and the critical state line of e–lnp′ curves and the modified Cam-clay model, the correlation between the initial void ratio and the mean effective stress in the field is deduced and used in the simulation by ABAQUS. A soil-nailing case is simulated in ABAQUS by means of the porous elasticity model and the critical state plasticity model. The deformation results of this soil nailing case are analyzed, and the rationality is verified by the monitoring data in practice. |
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