Investigation of Strain Localization in Geomaterials

在现场和实验室中，通常观察到土壤的变形集中在应变局部化破坏过程中形成的剪切带中。虽然这种机制得到了岩土工程师的广泛认可，但在数值解中仍然很难解释这一点。这项研究是一个合作研究项目的分析/计算部分，该项目包括南加州大学（USC）、凯斯西储大学（CWRU）和两个法国工程机构——格勒诺布尔机械研究所（IMG）和巴黎中央学院（ECP）。该研究将建立在CWRU， IMG和ECP的实验调查基础上，以基于梯度依赖塑性的有限元实现为基础，开发应变局部化的分析/计算框架，并包括不排水试验中孔隙水扩散的解释。实验和分析程序将导致更好地理解分叉和局部化现象，以及分析应变局部化的分析方法，不仅在实验室样品中，而且在实际的岩土工程边值问题中。＊＊＊

CMS-9622670 The deformation of soils in the field and laboratory are commonly observed to concentrate in shear bands formed during failure by strain localization. While this mechanism is widely appreciated by geotechnical engineers, it remains difficult to account for this in the numerical solutions. This research is the analytical/computational component of a collaborative research project which includes the University of Southern California (USC), Case Western Reserve University (CWRU), and two French engineering institutions - the Institute Mecanique de Grenoble (IMG) and the Ecole Centrale de Paris (ECP). The research will build on the experimental investigations at CWRU, IMG, and ECP to develop the analytical/computational framework for strain localization based on finite element implementation of gradient-dependent plasticity, and including account of the diffusion of pore water during undrained tests. The experimental and analytical program will lead to a better understanding of the phenomenon of bifurcation and localization, and to analytical methods for analyzing strain localization not only in laboratory specimens, but also in practical boundary value problems in geotechnical engineering. ***