Landslides in Sensitive Clays: From Geosciences to Risk by Jean-Sébastien L'Heureux, Ariane Locat, Serge Leroueil,

By Jean-Sébastien L'Heureux, Ariane Locat, Serge Leroueil, Denis Demers, Jacques Locat

Landslides in delicate clays signify a huge risk within the northern international locations of the realm reminiscent of Canada, Finland, Norway, Russia, Sweden and within the US kingdom of Alaska. prior and up to date examples of catastrophic landslides at e.g. Saint-Jean-Vianney in 1971, Rissa in 1979, Finneidfjord in 1996 and Kattmarka in 2009 have illustrated the good mobility of the remolded delicate clays and their dangerous retrogressive capability. those occasions demand a greater figuring out of landslide in delicate clay terrain to aid gurus with state of the art chance evaluate equipment, possibility administration schemes, mitigation measures and making plans. over the last many years the increased understanding relating to slope circulation in delicate clays has resulted in significant advances in mapping innovations and improvement of hugely refined geotechnical and geophysical research instruments. nice advances in numerical strategies facing innovative failure and landslide kinematic have additionally bring about bring up realizing and predictability of landslides in delicate clays and their results. This quantity comprises the most recent clinical learn by way of foreign specialists facing geological, geotechnical and geophysical features of slope failure in delicate clays and specializes in realizing the complete spectrum of demanding situations offered through landslides in such brittle materials.

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Example text

The safest method appears to be that proposed by Moum et al. (1968) in which modest diameter bore holes would be filled with crystalline salts and water, and the salt would dissolve and slowly diffuse (a few years, dependent on bore hole spacing) throughout the surrounding soil. K has advantages over Na in that its diffusion coefficient is greater, its effect is greater, and that, if the salinity is reduced by future leaching, K-saturated clay at low salinity has a higher liquid limit than does Na-saturated clay.

Am Mineral 72:832–838 Foscal-Mella OM (1976) Analyse mineralogique des argiles glaciaires. Masters thesis, Ecole Polytechnique, Montreal, Quebec, 148 p 36 J. Locat and D. St-Gelais Geertsema M, Torrance JK (2005) Quick clay from the Mink Creek landslide near Terrace, British Columbia: geotechnical properties, mineralogy, and geochemistry. Can Geotech J 42:907–918 Gillot JE (1971) Mineralogy of Leda clays. Can Mineral 10:797–811 Gravel JY (1974) Minéralogie de l’argile Champlain de St-Jean-Vianney.

Locat and D. 2 Mineralogical composition of selected sensitive clay sediments from Québec (all values are in %) 3 Nature of Sensitive Clays from Québec 29 30 J. Locat and D. St-Gelais plagioclase, the pyrosulfate method was used (Kiely and Jackson 1965). Plagioclase was determined by assigning the Na2O of the chemical analysis to anorthite (%An) indexed using the method proposed by Van der Plas (1966). Illite was determined by attributing the K2O obtained from selective dissolution in HCl at 825 °C (Reynolds and Lessing 1962).

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