Abstract
For estimating the behavior of Tokoname layer consisting of alternating strata of siltstone and sand during the excavation of an in-ground LNG tank, deformation properties are investigated by laboratory tests of undisturbed samples obtained by block sampling method and in-situ tests. In a triaxial compression test, Local Deformation Transducer (LDT) is used to measure the axial strain without the effects of bedding error at the specimen ends. Shear wave measurement is undertaken to study the effects of disturbance by sampling. The study shows that strain amplitude and confining pressure are considered as important factors for evaluating deformation properties of Tokoname layer, whereas anisotropy and disturbance by sampling are not as significant.
