This study describes the development and implementation of a numerical procedure for the analysis of coupled geotechnical problems involving finite deformations, changing boundary conditions, multiphase porous media and softening behaviour. The numerical scheme is first validated through a benchmark problem concerning the laying of an on-bottom offshore pipeline, and then some further highlights of the effects of soil softening are presented. The scheme is then specifically employed to study the penetration process of a full flow cyclic T-bar test in soft sensitive clay. An advanced soil constitutive model has been implemented to capture the effects of soil structure and its progressive de-structuring as well as soil fabric anisotropy. Accordingly, the changing soil resistance due to the combined effects of soil softening, remoulding and reconsolidation is illustrated, by considering a T-bar undergoing large amplitude cyclic sequences interspersed with consolidation periods. The results from the numerical simulations reveal the effects of soil softening on the soil deformation pattern, the evolution of shear bands, the generation of excess pore pressures and the process of soil reconsolidation.

这项研究描述了一种数值方法的开发和实现，用于分析涉及有限变形，边界条件变化，多相多孔介质和软化行为的岩土耦合问题。首先通过关于底下海上管道铺设的基准问题对数值方案进行了验证，然后提出了土壤软化效果的其他一些要点。然后，该方案专门用于研究软敏粘土中全流量循环T型杆试验的渗透过程。先进的土壤本构模型已被实施，以捕获土壤结构及其逐步解构以及土壤织物各向异性的影响。因此，由于土壤软化的综合作用，土壤抵抗力不断变化，通过考虑经历大振幅循环序列和固结期穿插的T型钢，来说明重塑和再固结。数值模拟的结果揭示了土壤软化对土壤变形模式，剪切带的演变，超孔隙压力的产生以及土壤固结过程的影响。