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Evaluating strength tests from foundation failures

From National Research Council Canada

Alternative titleRésistance au cisaillement: évaluation des essais
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Affiliation
  1. National Research Council of Canada
FormatText, Article
Conference9th International Conference on Soil Mechanics and Foundation Engineering, 1977
SubjectBasements and foundations; building failures; clay soils; foundations; compression tests; shear strength
Abstract
Three bearing capacity failures of tower silos have been analysed using in situ vane and triaxial strength tests on thin-wall piston tube samples obtained from the foundation clays. The investigations were carried out in Ontario, Canada, on a 15-m high silo on varved clay at New Liskeard, on a 21-m high silo on near-normally consolidated marine clay at Vankleek Hill, and on a 32-m high silo on overconsolidated marine clay near Richmond. Case records permitted evaluation of these test methods for measuring shear strength of the foundation soils. Analyses showed that the NGI vane measured the average shear strengths adequately in situ and that these strengths can be used to predict ultimate bearing capacity. In comparison, triaxial strength tests underestimated the vane test strengths in the varved clays and in the fissured or desiccated marine clay. Below the desiccated soil the triaxial peak strengths exceeded the vane strengths, but the post-peak values were considerably lower. The unconfined tests consistently underestimated the in situ measurements. The reasons for the apparent satisfactory performance of the vane for predicting ultimate bearing capacity are discussed.
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  • Proceedings, 9th International Conference on Soil Mechanics and Foundation Engineering 1 (1977): 55–59.
LanguageEnglish
Peer reviewedNo
IdentifierDBR-P-747
NRC numberNRCC 16386
NRC-IRC-48
NPARC number20358467
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Record identifier61d971f7-a04d-4fea-ad05-4ba6c7a5c083
Record created2012-07-20
Record modified2024-03-14
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