砂土液化分析的散粒体模型(英文)

在归纳砂土组构张量研究成果的基础上提出一个与已有弹塑性模型不同的新的增量非线性模型。该模型全面地考虑了平均压应力、归一化剪应力、Ｌｏｄｅ 角和主应力轴变化所引起的可逆和不可逆的变形，成功地模拟了单调荷载下密砂的剪胀软化和松砂的不排水剪切失稳现象，往复荷载下的残余变形和孔隙压力积累以及Ｌｏｄｅ 角和主应力轴变化下的液化现象。

A granular medium model for liquefaction analysis of sands

In this paper the main achievements gained from the study on the change of sand texture during its deformation are summarized first, and then an incrementally nonlinear model different from the existing elasto plastic ones is presented. In the formulation of this model both the reversible and the irreversible deformation due to the change of mean normal stress and normalized shear stress, the turn of stress path and the rotation of principal stress axis have been taken into account. The computed examples show that the proposed model can successfully simulate the softening of dense sand due to dilatancy and the undrained instability of loose sand under monotonous loading, the accumulation of residual strain and pore pressure during repeated loading and also the liquefaction induced by the change of Lode's angle and the rotation of principal stress axis.