论文部分内容阅读
通过构造Biot固结理论u-p方程的无网格伽辽金-有限元耦合方法,对砂土液化变形问题进行了数值模拟。对于饱和砂土,采用Oka等提出的弹塑性本构模型,同时采用更新的Lagrange计算格式推导了控制方程。耦合方法能够发挥有限元和无网格各自的优点,既避免了由于单元变形扭曲而引起的计算中断,也可节约计算时间,算例验证了该方法在地震液化问题中的有效性。
Through the element-free Galerkin-finite element method coupled with Biot’s solid theory u-p, the liquefaction and deformation of sand is numerically simulated. For saturated sand, the elasto-plastic constitutive model proposed by Oka et al. Is adopted and the governing equations are deduced by using the updated Lagrange calculation formula. Coupling method can give full play to the advantages of both finite element and meshless element. It not only avoids the calculation interruption caused by the deformation of the element, but also saves the calculation time. The example shows that the method is effective in the earthquake liquefaction problem.