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- W2022762112 abstract "In 1973 the Saskatchewan Department of Highways began construction of a crossing over the North Saskatchewan River at Maymont, Saskatchewan. The south approach to the river required a cut some 20 m in depth at the top edge of the valley and when the excavation reached the design elevation a massive failure occurred on one of the backslopes. The major portion of the slip surface followed a slickensided clay shale zone. An analysis of the failure indicates residual angles of shearing resistance were being mobilized. The reason for mobilizing only the residual strength is attributed to previous shearing arising from glacial ice-thrusting.The sliding occurred entirely within the sediments of the nonmarine Upper Cretaceous Judith River Formation, but the strengths mobilized were essentially the same as those mobilized by slides in the marine Upper Cretaceous Bearpaw and Lea Park Formations. Negative water pressures arising from the stress change due to excavating did not appear to influence the stability. Direct shear box tests on natural slickensided surfaces gave strengths higher than required for a safety factor of unity. The testing of precut surfaces gave results that seem to correlate more closely with the field residual strengths. Furthermore, the Maymont case history clearly illustrates the need for identifying geological details and demonstrates the engineering significance of glacial ice-thrusting." @default.
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- W2022762112 date "1979-11-01" @default.
- W2022762112 modified "2023-09-24" @default.
- W2022762112 title "A highway cut failure in Cretaceous sediments at Maymont, Saskatchewan" @default.
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- W2022762112 doi "https://doi.org/10.1139/t79-079" @default.
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