Showing papers in "Canadian Geotechnical Journal in 1968"
TL;DR: In this article, the ultimate uplift capacity of foundations with special reference to transmission tower footings is evaluated and a number of model uplift tests made by the authors and by others are studied and evaluated.
Abstract: The ultimate uplift capacity of foundations with special reference to transmission tower footings is evaluated. A number of model uplift tests made by the authors and by others were studied and com...
540 citations
TL;DR: In this article, the principal aim is to compare laboratory settlement and pore pressure dissipation rates of undisturbed Leda clay with those predicted from a modified consolidation theory developed by the authors.
Abstract: The principal aim of this paper is to compare laboratory settlement and pore pressure dissipation rates of undisturbed Leda clay with those predicted from a modified consolidation theory developed ...
46 citations
TL;DR: In this paper, a method is proposed that enables the preselection of a test duration such that the strength measured is that of the fully drained soil, and the procedure has been developed by both empirical and theoretical means.
Abstract: The field vane test is usually used to measure the strength of clays, but it may also be applied to measurements in silty soils. Because of the relatively high permeability of silts, drainage of the soil surrounding the vane can take place even during a fairly rapid test.A method is proposed that enables the preselection of a test duration such that the strength measured is that of the fully drained soil. The procedure has been developed by both empirical and theoretical means.
37 citations
TL;DR: A 26'ft. high approach fill was constructed in November 1959 for a bridge over the Rideau river near Kars, Ontario as mentioned in this paper, where the fill was placed over 50'ft of Leda clay, the lower 30' ft. of which was extre...
Abstract: A 26 ft. high approach fill was constructed in November 1959 for a bridge over the Rideau river near Kars, Ontario. The fill was placed over 50 ft. of Leda clay, the lower 30 ft. of which was extre...
17 citations
14 citations
TL;DR: In this article, the authors present a study of a number of unusual abutment movements that have occurred at seven underpass structures on the Macdonald-Cartier Freeway between Cornwall and the Quebec border.
Abstract: This paper presents a study of a number of unusual abutment movements that have occurred at seven underpass structures on the Macdonald-Cartier Freeway between Cornwall and the Quebec border. The locations of these structures are shown in Figure 1. The movements were of such magnitude at three of the structures that extensive repair work has been necessary.An explanation for these unusual abutment movements is presented. Remedial measures are suggested and measures are outlined to avoid the occurrence of such movements in areas where comparable subsoil and loading conditions would prevail.
13 citations
TL;DR: The Smelter of Quebec Iron and Titanium Corporation at St. Joseph de Sorel, Quebec, is located in an area which is underlain by about 80 feet of compact stratified sand, silt, and clay, followed by...
Abstract: The Smelter of Quebec Iron and Titanium Corporation at St. Joseph de Sorel, Quebec, is located in an area which is underlain by about 80 feet of compact stratified sand, silt, and clay, followed by...
9 citations
TL;DR: In this article, the causes of pile bending were discussed, and a general hypothesis put forward to explain pile bending was presented, and the practical implications of the bending were treated in detail.
Abstract: During a pile-testing program at the site of Ontario Hydro's new Lambton generating station, three H-section piles were instrumented to determine whether they drove straight and were subsequently load tested Very large deflections that occurred about the weak axis of the piles were measured The practical implications of pile bending are treated in detail, the causes of pile bending discussed, and a general hypothesis put forward to explain pile bending
8 citations
8 citations
TL;DR: In this article, the results of more refined sampling and testing methods showed that the preconsolidation pressure had been underestimated by 1'ton/sq. ft. and that the imposed stresses would in fact fall within the recompression range.
Abstract: Before construction, standard consolidation tests indicated that the stresses imposed by a high embankment on a deep and relatively homogeneous deposit of Leda clay would exceed the preconsolidation stress and result in settlements of up to 18 in. Later, the results of more refined sampling and testing methods showed that the preconsolidation pressure had been underestimated by 1 ton/sq. ft. and that the imposed stresses would in fact fall within the recompression range. Time-settlement relationships, however, were not elastic; vertical strains continued to increase long after the embankment was completed. Field measurements of settlement are compared with values computed using compression moduli determined both from consolidation and compression tests in the laboratory.
6 citations
TL;DR: In this article, the post-peak stress-strain behavior of three different clays was investigated by using an in-direct method, and AXIAL STRAINS of up to 200% were achieved.
Abstract: THE POST-PEAK STRESS-STRAIN BEHAVIOUR IN UNDRAINED SHEAR OF THREE DIFFERENT CLAYS WAS INVESTIGATED BY USING AN INDIRECT METHOD. THIS METHOD, WHICH IS IN PRINCIPLE SIMILAR TO THAT USED BY KALLSTENIUS (1963), CONSISTS IN FIRST COMPRESSING A CLAY SPECIMEN TO A GIVEN POST PEAK STRAIN BETWEEN TWO PARALLEL PLATENS AND SUBSEQUENTLY DETERMINING ITS CURRENT REMOULDED STRENGTH BY THE LABORATORY VANE METHOD. BY A REPEATED COMPRESSION PROCEDURE, AXIAL STRAINS OF UP TO 200% WERE ATTAINED. AS THE THREE CLAYS TESTED DIFFERED WIDELY IN SENSITIVITY, A COMPARISON OF THEIR POST- PEAK BEHAVIOUR MADE CLEARLY APPARENT THE EFFECT OF STRUCTURAL BREAKDOWN ON THE RESERVE SHEAR STRENGTH AT LARGE STRAINS. /CGRA/
TL;DR: In this article, the curve of pressure against log of time has a typical reversed S shape, similar to that of consolidation, and it is shown that the curve is stable under complete inundation.
Abstract: Experimental results of swell pressure under complete inundation show that the curve of pressure against log of time has a typical reversed S shape, similar to that of consolidation. No endeavour, ...
TL;DR: A deep, steel sheet piled, figure-eight cofferdam with circular steel wales was installed as a temporary substructure during the construction of the City of Ottawa Pollution Control Centre Project as discussed by the authors.
Abstract: A deep, steel sheet piled, figure-eight cofferdam with circular steel wales was installed as a temporary substructure during the construction of the City of Ottawa Pollution Control Centre Project....
TL;DR: A timber crib intake structure was constructed approximately 200'ft. offshore in a lake, founded on very soft to soft clay, of high moisture content and sensitivity as discussed by the authors, which has a two-part consolidation curve, with the break occurring at a point about 400'lb/sq. ft.
Abstract: As part of the development of a site in northern Quebec for a paper mill and associated townsite, a separate water intake structure and pumping works were required to serve the townsite. A timber crib intake structure was constructed approximately 200 ft. offshore in a lake, founded on very soft to soft clay, of high moisture content and sensitivity.The clay is a late glacial freshwater sediment which has been consolidated by pressures probably not exceeding the existing overburden pressure. Careful sampling and testing of the clay, however, indicated a two-part consolidation curve, with the break occurring at a point about 400 lb./sq. ft. in excess of the in situ overburden pressure. Beyond the break in the oedometer curve the compression index was up to 30 times greater than in the initial portion, being a maximum of 3.0 to 3.5.The crib was founded on a sand and gravel mattress, keyed into the lake bottom, the resulting net stress increase on the clay being slightly within the inferred range of apparent...