ISO/TS 22476-10:2005 PDF Download

ISO/TS 22476-10:2005 is a standard that specifies laboratory test methods for determining the effective shear strength parameter of soils during geotechnical investigations. It is in accordance with the EN 1997-1 and EN 1997-2 standards.

The test method involves placing a test specimen in a direct shear device and applying a predetermined normal stress. The specimen is then drained or wetted, or both, to allow for consolidation under normal stress. The frames holding the specimen are unlocked, and one frame is displaced horizontally with respect to the other at a constant rate of shear-deformation. Shearing force and horizontal displacements are measured as the specimen is sheared, with shearing applied slowly to allow excess pore pressures to dissipate and ensure effective stresses are equal to total stresses.

The direct shear test is commonly used in earthworks and foundation engineering to determine the effective shear strength of soils. It provides valuable information for designing and evaluating structures and foundations, and helps assess the stability and deformation characteristics of soils in various geotechnical applications.