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Characterization of the anisotropy of a normally consolidated soft clay

Khemissa M.

Studia Geotechnica et Mechanica

2011

Vol. 33, nr 2

41-65

The natural soils were deposited in successive layers during thousands of years. They develop different horizontal and vertical shear strengths, characteristic of their in-situ anisotropic behaviour. This article describes the anisotropy of the mechanical properties of resistance and deformability of a normally consolidated soft clay, based on the standard triaxial test results. The results presented highlight the anisotropic character of this natural clay and determine its parameters of aelotropy. The analysis carried out made it possible to note that the hyperbolic approach of determining deformation moduli (nonlinear elastic behaviour) is adapted probably better than the linear elastic approach (Hooke's law) and undoubtedly more relevant than the analysis of structures founded on anisotropic soils.

Sample disturbance - soft clays

Groot D. J, Poirier S. E., Landon M. M.

Studia Geotechnica et Mechanica

2005

Vol. 27, nr 3-4

91-105

This paper reviews the causes of sample disturbance and its impact on laboratory measured design parameters for soft clays. It is the most significant issue affecting the quality and reliability of laboratory test data. All key design parameters such as compressibility, yield stress and undrained shear strength are adversely influenced by sample disturbance. Each stage of the sampling process, from initiation of drilling to final preparation of laboratory test specimens, causes potential disturbance to samples and is described in the paper. Several practical solutions are presented, which if properly implemented can reduce the degree of sample disturbance. These include the use of weighted drilling mud, special tube sample geometry, fixed piston samplers, and proper sealing and handling of samples. Qualitative and quantitative methods of assessing sample quality are also presented together with examples from case studies.

Wpływ tradycji na nowoczesność

Lewowicki S., Al-Zamzami M.

Warstwy

2000

nr 3

105-107