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SEASONAL RATCHETING AND SOFTENING IN CLAY SLOPES, LEADING TO FIRST-TIME FAILURE (2011)
Centrifuge tests have been carried out on kaolin clay slopes subject to variations in surface rainfall and humidity corresponding, at model scale, to successive wet and dry seasons in the field. An analysis of the phase of
episodic regional softening is presented in this paper, based on a Spencer limit-equilibrium approach. These back-analyses illustrate that clay slopes which temporarily mobilise an average stress ratio in excess of the critical state stress ratio during any portion of a typical year may eventually be brought to a long-term failure under the action of seasonal variations of pore pressure.
Reference:
Geotechnique 61, No. 9, 757–769
Geotechnique 61, No. 9, 757–769
Organization:
Department of Civil Engineering, Queen’s University, Kingston, Ontario, Canada
Canada, Ontario
Department of Civil Engineering, Queen’s University, Kingston, Ontario, Canada
Canada, Ontario
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Chrysanthos on Apr 21, 2013
This paper evaluates the effects of water infiltration in a model clay slope in centrifuge testing and how the slope failure mechanisms are developed. It shades some light regarding the softening behavior of clay slopes and why instability may initiate near the toe. This paper provides interesting test results and interpretation regarding slope stability and the effects of suction and infiltration.
