Evaluating strength tests from foundation failures/ resistance au cisaillement: evaluation des essais

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Pages5559; # of pages: 5
Subjectbuilding failures; clay soils; foundations; compression tests; shear strength; Basements and foundations
AbstractThree 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.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number16386
NPARC number20358467
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Record identifier61d971f7-a04d-4fea-ad05-4ba6c7a5c083
Record created2012-07-20
Record modified2016-05-09
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