Foundation failure of the Vankleek Hill tower silo

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Pages885902; # of pages: 18
Subjectconcrete (materials); bearing capacity; causes of failures; foundations; marine clay; shear strength; Basements and foundations
AbstractThe bearing capacity failure of the foundation supporting a 70-ft (21-m) high, 20-ft (6-m) diameter concrete silo provided an excellent opportunity to analyse the shear strength of the soil and to check existing bearing capacity theories. The strength of the marine clay soil measured in situ with a field vane shortly after the failure occurred had a minimum value of 0.16 kg/cm[2] at a depth of 12 ft (3. 7 m), then increased gradually with depth. Consolidation tests carried out on undisturbed piston tube samples showed that the foundation pressures had greatly exceeded the preconsolidation pressure of the soil. Laboratory strength tests included triaxial CAU tests with pore pressure measurements and small vane tests performed at various inclinations from the vertical to investigate strength anisotropy. Preliminary analysis showed a good correlation between the ultimate bearing capacity of the soil and the reduced shear strength due to anisotropy.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number12730
NPARC number20374865
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Record identifier43e602af-1821-48ab-aa75-4c4ae3323b70
Record created2012-07-23
Record modified2016-05-09
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