AN ASSESSMENT OF THE MACROSCOPIC QUANTIFICATION OF ANISOTROPY IN COHESIVE SOILS

摘要

The response of natural and remolded cohesive soils is known to be anisotropic. Soil anisotropy is largely attributed to the preferred arrangement of particles, particle groups and pore spaces. In this paper, the results of previous studies of such microfabric in soils are reviewed in some detail. This is followed by a summary of soil anisotropy, with emphasis on cohesive soils, and an assessment of ways in which its evolution is quantified macroscopically. Using a recently developed anisotropic, time-dependent bounding surface model for cohesive soils as a representative example, the manner in which anisotropy is accounted for in this and similar models is critically assessed. The paper concludes with a brief discussion of experimental needs that would greatly facilitate the study and rational quantification of anisotropy, and its evolution, in cohesive soils.