The proper solution of geotechnical boundary value problems requires robust constitutive models that can describe the mechanical behavior of geomaterials under various loading conditions, while also accounting as closely as possible for the different material scales of interest. This is even more relevant to granular media where the complexity of the mechanical behaviour is not limited to the nature of the contact law between grains, and instead originates from the multiplicity of contacts oriented along all the directions of the physical space to form distinctive mesostructures. This paper revisits the so-called H-model, which belongs to the broad family of micromechanical approaches whereby an intermediate scale (mesoscale) is explicitly introduced into the formulation. One great advantage of the model is that it can be extended by accounting for further multi-physical couplings, as for example the presence of capillary bridges between grains. This versatile model was implemented within an explicit finite difference based computational software (FLAC), and the present work demonstrates its ability to analyze engineering problems with a microstructural viewpoint, while also providing new insights in microstructural mechanisms of failure difficult to capture with standard phenomenological models.

岩土边值问题的正确解决方案需要鲁棒的本构模型，该模型可以描述岩土材料在各种载荷条件下的力学行为，同时还应尽可能考虑不同的目标材料尺寸。这与粒状介质更为相关，在粒状介质中，机械行为的复杂性不仅限于晶粒间接触定律的性质，而是源于沿着物理空间所有方向定向以形成独特的介观结构的大量接触。本文重温了所谓的H模型，该模型属于广泛的微机械方法家族，在该模型中，明确将中等规模（中尺度）引入了配方中。该模型的一大优势是，可以通过考虑进一步的多物理耦合来扩展它，例如，晶粒之间存在毛细桥。这个通用的模型是在基于显式有限差分的计算软件（FLAC）中实现的，并且当前的工作证明了它具有用微观结构观点分析工程问题的能力，同时还提供了用标准现象学模型难以捕获的失效微观结构机理的新见解。 。