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Load Tests on Long Bearing Piles / R. D. Darragh, R. A. Bell

Conference Author
Performance of Deep Foundations (1968 : San Francisco, Calif.)
Published
West Conshohocken, Pa. : ASTM International, 1969.
Physical Description
1 online resource (27 pages) : illustrations, figures, tables
Additional Creators
Bell, R. A., Darragh, R. D., American Society for Testing and Materials, and ASTM International
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Summary
Load tests were performed on corrugated step-tapered piles with pipe extensions and pipe piles driven through 120 ft of slightly overconsolidated, medium-to-stiff, fissured clays 1 to 10 ft into dense fine sands and silty sands. Failure loads for the bearing piles of 10¿̐ư to 12¿̐ư in. tip diameter varied from 180 to 280 tons. Design dead loads up to 90 tons, which could be temporarily carried in friction in the upper compressible soils, were expected to be eventually transmitted to the sand stratum. The bearing capacity of the sand was evaluated by subtracting friction in the upper clays, as measured by piles stopped above the sand, from the total load carried by the bearing piles. The developed friction capacity was uncertain because of variations in soil strength between load test locations. However, the following conclusions are indicated by the test data and wave equation analyses of the driven piles: (1) the corrugated step-tapered piles developed frictional resistances in the clays equal to or greater than the minimum undrained shear strength determined by unconfined compression tests, (2) pipe piling frictional resistances were about two thirds of the corrugated pile values, and (3) the bearing capacity of the sand was overestimated 70 to 100 percent by wave equation analyses of the ultimate resistance of bearing piles driven to practical refusal and 150 to 400 percent by bearing capacity formulae using full overburden pressures and bearing capacity factors for laboratory-measured angle of internal friction of the sand.
Dates of Publication and/or Sequential Designation
Volume 1969, Issue 444 (January 1969)
Subject(s)
Other Subject(s)
ISBN
0803166443
9780803166448
9780803169012 (e-ISBN)
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 13.
Other Forms
Also available in PDF edition.
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
Full text article also available for purchase.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1969. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
View MARC record | catkey: 28007675