Seasonal movements in some Canadian clays/Mouvements saisonniers de quelques argiles canadiennes

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Pages264268; # of pages: 5
Subjectclay soils; epeirogeny; climatic loads; seasonal variations
AbstractIn many countries there are problems resulting from building on clays that undergo differential movements due to seasonal shrinking or swelling. In South Africa, for instance, the problems are mainly caused by swelling whereas in England they are more often due to shrinking of the clay. Both problems exist in Canada. If the natural precipitation or evaporation at the ground surface is disturbed, as is the case when the ground surface is covered by a structure, the water content of the soil will be affected causing the clay to shrink or swell depending on its initial condition. Ground movements are also related to seasonal climatic conditions, such as precipitation, evapo-transpiration and temperatures which affect the water content of the soil. In Canada the problem of soil movement has been observed in British Columbia throughout the Prairies and in the Ottawa- St Lawrence lowland. Detailed studies are being carried out at Winnipeg and Ottawa where ground movements are being measured to depths of 8 ft. or more, using multi-rod gauges and concentric telescopic ground movement gauges. Readings have been collected at locations near trees, under flat slabs, in grass plots and on water-mains. Results from these measurements and the correlation of the variables are presented.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number4382
NPARC number20373996
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Record identifier0a8e3e62-21be-44dc-b0a3-35e3b5d0adf2
Record created2012-07-23
Record modified2016-05-09
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