Shallow foundations on swelling clays in western Canada

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ConferenceProceedings International Research and Engineering Conference on Expansive Clay Soils: 30 August 1965, Texas A&M Univeristy, Texas, USA
Pages183207; # of pages: 25
Subjectshallow foundations; swelling clay; heave; Basements and foundations; fondation superficielle; argile gonflante; soulevement
AbstractThe volume change of soils high in clay content is closely related to their moisture content, which in turn is a function of climate, vegetation and physico-chemical properties of the natural clay-water system. Man-made structures have a disturbing effect on long-established dynamic equilibrium conditions that have developed under a natural environment. Foundation designs for small structures must take into account and attempt to minimize potential movements and damage to superstructures. In Western Canada differences in performance of shallow foundations arise from rather small differences in regional climate. Results are presented of studies made on slab-on- ground, full basement, and crawl-space foundations, utilizing pile (pier) and beam construction (both short belled and long straight piles), and shallow spread footings. In general, slabs-on-ground have performed well in Winnipeg, Manitoba, and poorly in Regina, Saskatchewan. Heaving of basement floors is a serious problem in all areas where clay sub-soils undergo a rebound-swelling due to reduced loading. Maintenance of an adequate void space beneath grade beams is a key to good performance of deep pile and beam foundations. Shallower, belled piles and spread footings, heave approximately the same amount as surface foundations.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number9872
NPARC number20375083
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Record identifier3a36a90b-42ca-45a1-948e-e3933c67f8c3
Record created2012-07-23
Record modified2016-05-09
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