4. Residual strength of volcanic clay: two case studies
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Published:1991
D. H. Cornforth, MS, PhD, K. F. Fujitani, MS, 1991. "4. Residual strength of volcanic clay: two case studies", Slope stability engineering developments and applications: Proceedings of the international conference on slope stability organized by the Institution of Civil Engineers and held on the Isle of Wight on 15–18 April 1991, The Institution of Civil Engineers
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Two landslides, in close proximity to each other, occurred in stiff clayey silts derived from weathered volcanics of the Yamhill Formation. Initial testing of the general overburden soils gave consistent residual strength values of φ'r = 33°. However, samples taken at the failure zone, determined by inclinometers, gave much lower residual strengths which were in close agreement to the back-calculated strengths for the landslides. The laboratory φ'r of 9° and 22° described in the two case studies differ significantly, probably reflecting variable weathering and soil alteration. It is concluded that samples for strength testing need to be taken from the failure zone in these soils.
INTRODUCTION
CASE STUDY 1
CASE STUDY 2
CONCLUSIONS
ACKNOWLEDGEMENTS
REFERENCES
