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Title: Effects of near-surface environmental conditions on instability of an unsaturated soil slope
Authors: Blatz, JA
Ferreira, NJ
Graham, J
Keywords: slope stability
unsaturated soils
laboratory tests
soil suction
seepage modeling
flux boundary
Issue Date: 3-Dec-2004
Citation: 0008-3674; CAN GEOTECH J, DEC 2004, vol. 41, no. 6, p.1111 to 1126.
Abstract: In 1999, after a period of extensive rainfall, two shallow slope failures developed in the right-of-way of Provincial Road 259 near Virden, Manitoba. The rainfall caused dissipation of soil suction in the near-surface soil, thereby reducing shear resistance and triggering failure. A research project was initiated between the Geotechnical Group at the University of Manitoba and the Manitoba Department of Highways and Transportation to assess the mechanism of failure. The project included a field investigation program, laboratory testing program, and advanced numerical modeling to identify the cause of failure. The results demonstrate that the rainfall resulted in dissipation of the suction in the soil slope, resulting in a reduction in the soil shear strength that triggered shallow failures. The dissipation of the soil suction has been modeled using a time-dependent seepage model that accounts for the flux boundary condition that existed at the ground surface.
Appears in Collection(s):Research Publications (UofM Student, Faculty and Staff only access)

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