The paper describes a detailed testing programme carried out in order to examine the effects of anisotropy on the behaviour of unsaturated soils. As part of the work presented, samples of unsaturated kaolin were prepared using isotropic compression. The suctions in these samples were reduced to predefined values by wetting under low isotropic loading. The pore size distributions, the pressure-volume relationships and yielding under subsequent isotropic loading and shear loading are compared with tests on samples prepared by statically compressing kaolin into a one-dimensional compaction mould. The shape of the LoadingCollapse (LC) yield locus, the normal compression lines, critical state lines are shown to be significantly influenced by the previous stress history and are shown to be different for isotropically and one-dimensionally prepared samples.
|Title of host publication||Experimental Studies in Unsaturated Soils and Expansive Soils|
|Publisher||Taylor & Francis|
|Publication status||Published (in print/issue) - 3 Nov 2009|