Question

Enumerate the types of laboratory triaxial test you would specify to be carried out in connection with the following field problems: (a) the stability of a clay foundation of an embankment, the rate of construction being such that some consolidation of the clay occurs; (b) the initial stability of a footing on saturated clay (c) the long-term stability of slope in stiff fissured clay. Give your reasons for your choice of test.

4. Enumerate the types of laboratory triaxial test you would specify to be carried out in connection with the following field problems: being such that some consolidation of the clay occurs; (b) the initial stability of a footing on saturated clay (c) the long-term stability of slope in stiff fissured clay. Give your reasons for your choice of test.

Answer 1

a) The analysis is carried in terms of effective stress using effective stress parameters c^1 and phi^1 obtained from consolidated - untrained test or drained test along with the measurement of pore pressure Because as we know the clay is more susceptible to stress variations upon wetting and also the magnitude of pore vertical stress due to the weight of embarrassment and also by shear steer induced beneath it. b) The analysis is carried in terms of total stress using the volume of untrained cohesion obtained from undermined tests because the stress changes are likely to lead to failure occurrence under underlined conditions. Also the soil is saturated that measures \r\n phi = 0 The analysis will be applicable for such a case c) In such soil types, the analysis is carried in terms of effective stress using effective stress parameters c^1 and phi^1 obtained from drained test. As we know, stiff - figured clay is more susceptible to variation on wetting. so