论文标题
土地材料中的压实带定位：机械一致的故障标准
Compaction band localization in geomaterials: a mechanically consistent failure criterion
论文作者
论文摘要
压实带在多孔岩石的变形过程中起关键作用，并解释地质形成中物理过程的不同方面。从机械的角度来看，导致压实带的局部菌株的最新描述具有局限性。因此，我们使用一致的公理公式来描述现象。我们使用最小的假设构建了粘塑性模型。我们将模型基于六个原理，以研究由粘性效应触发的压实带定位。我们分析不同的应力状态以确定触发压实带的条件。实验室实验表明，根据限制压力，材料会经历不同的定位。因此，我们执行一系列数值实验，这些实验在不同的三轴压缩条件下重现了这些现象。这些仿真使用基于Perzyna的粘塑性的简单粘膜构成模型，用于蠕变，并显示限制如何改变不同三轴测试的定位类型。我们的分析使我们能够描述这种过渡，频段周期性和间距以及它们对材料参数的依赖。
Compaction bands play a key role in the deformation processes of porous rocks and explain different aspects of physical processes in geological formations. The state-of-the-art description of the localized strains that lead to compaction banding has limitations from the mechanical point of view. Thus, we describe the phenomenon using a consistent axiomatic formulation. We build a viscoplastic model using minimal assumptions; we base our model on six principles to study compaction band localization triggered by viscous effects. We analyze different stress states to determine the conditions that trigger compaction bands. Laboratory experiments show that a material undergoes different localizations depending on the confinement pressure; thus, we perform a series of numerical experiments that reproduce these phenomena under varying triaxial compression conditions. These simulations use a simple viscoplastic constitutive model for creep based on Perzyna's viscoplasticity and show how confinement changes the localization type for different triaxial tests. Our analysis allows us to describe this transition, band periodicity and spacing, and their dependence on the material parameters.
