The oedometric compaction of materials with collapsible structure is investigated from a numerical point of view. Such materials form planar zones of localized volumetric deformation that may or may not be accompanied by grain crushing. The purpose of the present work is to investigate the evolution of the permeability and its anisotropy as the result of the formation of compaction bands. The finite element method is used for the simulations with the commercial software ABAQUS. The mechanical response is calibrated on experimental results from the literature. Due to the localization of the deformation, the problem is not numerically stable and shows mesh dependence when a simple material model is used. To resolve the issue a nonlocal formulation is implemented. Drained oedometric tests are simulated. For the permeability different formulations are used, either ignoring the anisotropic evolution of the pore network or accounting for it. The results show that permeability anisotropy at the microscale needs to be considered, because otherwise the predicted reduction in permeability is qualitatively not in agreement with experimental results. On the whole, it is concluded that the permeability reduction following the formation of compaction bands can be highly anisotropic both at the micro and the macro scale.

从数值的角度研究了具有可折叠结构的材料的几何压实。这种材料形成局部体积变形的平面区域，可能伴随也可能不伴随颗粒破碎。目前工作的目的是研究由于压实带形成而导致的渗透率及其各向异性的演变。有限元方法用于商业软件ABAQUS的模拟。机械响应根据文献中的实验结果进行校准。由于变形的局部化，当使用简单的材料模型时，该问题在数值上不稳定并且表现出网格相关性。为解决该问题，实施了非本地公式。模拟排水的 oedometric 测试。对于渗透率，使用不同的公式，要么忽略孔隙网络的各向异性演化，要么考虑它。结果表明，需要考虑微观尺度上的渗透率各向异性，否则预测的渗透率降低与实验结果在定性上不一致。总的来说，可以得出结论，压实带形成后渗透率的降低在微观和宏观尺度上都是高度各向异性的。