Localization of Deformation and Inelastic Deformation of Geomaterials

这项研究将固体力学的最新进展应用于剪切局部化行为，并开发了一种经过验证的方法来预测岩石和混凝土结构等岩土材料的稳定性。这项工作的主要目的是了解岩土材料中应变局部化的物理过程，并为实验室观测向应用的外推提供理论框架。对岩石等对非弹性变形和非弹性体积变化敏感的岩土材料进行了全面的剪切局部化研究。这些研究将理论分析与计算和实验工作相结合。将制定改进的多轴和非弹性变形的本构关系，并开发一个框架，以便在数值程序中使用本构模型。具体地说，将基于均匀变形的分叉模型来研究压力敏感和非弹性可压缩固体中的剪切破裂。然后，本地化研究将结合实验观测和数值计算来研究岩土结构多轴变形的非弹性本构关系的性能。

The research applies recent solid mechanics advances to shear localization behavior and develops a verified approach to predict the stability of geo-materials such as rock and concrete structures. The main goal of this work is to understand the physical process of strain localization in geo-materials and provide a theoretical framework for the extrapolation of laboratory observation to applications. Comprehensive studies are conducted on shear localization in rocks and other geo-materials that exhibit sensitivity of inelastic deformation and inelastic volume change. The studies combine theoretical analyses with computational and experimental work. Improved constitutive relations for multiaxial and inelastic deformation will be formulated and a framework will be developed for the use of constitutive models in numerical codes. Specifically, shear rupture in pressure-sensitive and inelastically compressible solids will be investigated based on models involving bifurcation from homogeneous deformation. The investigations of localization will then be used with experimental observations and numerical calculations to study the performance of inelastic constitutive relations for multiaxial deformation of geo-structures.