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1 2008

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A study of the slope stability in unsaturated marly clay soil

Jamei M., Guiras H., Ben Hamouda K. B., Hatira M., Olivella S.

Studia Geotechnica et Mechanica

2008

Vol. 30, nr 1-2

95-106

The analysis of some experimental field data on an unsaturated unstable slope made of a marly clay soil showed that the swelling and collapse phenomena gave rise to the landslide problem. In the case studied, field investigation data and laboratory tests based on determining the water retention curve were analysed. The recorded pore-water pressure field helped us to identify the hydrological conditions. In fact, wet and dry cycles involve a total suction and saturation changes. To predict the shallow slope failure, a constitutive model taking into account the suction effect as well as its dependence on the degree of saturation is proposed. It is especially remarkable that the collapse phenomenon is well reproduced when the model incorporates suction changes and saturated and unsaturated preconsolidation stresses. The analysis of the slope failure, based on the field data and on the theoretical study, shows the hydraulic and mechanical effects.