The St. Boniface Landslide of April 1996: a Large Retrogressive Landslide in Sensitive Clay with Little Flow Component
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Published:2000
D. Demers, D. Robitaille, D. Perret, 2000. "The St. Boniface Landslide of April 1996: a Large Retrogressive Landslide in Sensitive Clay with Little Flow Component", Landslides in Research, Theory and Practice: Proceedings of the 8th International Symposium on Landslides held in Cardiff on 26–30 June 2000, E. Bromhead, N. Dixon, M-L. Ibsen
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On April 21st, 1996, a massive landslide occurred along the Rivière Machiche, about 5 km south of Saint-Boniface-de-Shawinigan, in the sensitive clays of Eastern Canada. The movement is one of the largest to have occurred in the St. Lawrence Lowlands over the last century. The slide is characterized by 10 unbroken ridges, some of which run parallel to the river for a distance of 700 m. It produced a horst and graben lateral spread with very little debris flow. Piezocone tests, vane tests and soil samples confirm the type of landslide and show that the failure surface was not uniform and controlled by contrasting mechanical properties of the soil.
INTRODUCTION
GEOLOGICAL AND GEOMORPHOLOGICAL CONTEXT
SITE DESCRIPTION
STRATIGRAPHY AND GEOTECHNICAL PROPERTIES
ANALYSIS OF FAILURE MODE
CONCLUSIONS
BIBLIOGRAPHY
