Swelling Clay in Two Slope Failures at Toronto, Canada
1971; NRC Research Press; Volume: 8; Issue: 3 Linguagem: Inglês
10.1139/t71-043
ISSN1208-6010
AutoresR. M. Quigley, M. A. J. Matich, R. G. Horvath, H. H. Hawson,
Tópico(s)Landfill Environmental Impact Studies
ResumoSwelling clay minerals present in stiff to hard glacio-lacustrine soils along part of the Don Valley Parkway, Toronto, are believed to have accelerated soil softening and subsequent failure of several slopes only 4 to 8 years after construction. Fairly low residual friction angles of 16° give some indication of the presence of these swelling minerals, whereas low activity values of 0.4 to 0.5 give no indication of their presence.Mineralogic analyses show the soils to consist of abundant illite, chlorite, and carbonate, and moderate amounts of quartz, feldspar, and swelling clay. The swelling clays (10–15% of soils) are an unusual pseudo-montmorillonite formed from soil-vermiculite by adsorption of complex aluminum and iron hydroxide cations in an ancient, acid, weathering environment. Since the clay beds studied have not themselves been weathered, then they must be erosion products from earlier geologic formations in the Toronto area which have not yet been identified.
Referência(s)