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Lessons from Test and Production Programmes for Driven Piles in Sand
This case study outlines an installation and loading test programme conducted for foundation design at an oil sands mine in Alberta, Canada. Design was for approximately 10,000 driven steel piles of various sizes founded in dense glacial deposits of sand and silty sand. Included are results from pre-construction loading tests (9 static axial tests, 56 high strain dynamic test measurements) and construction QA/QC (7 static axial tests, 5% of piles with high strain dynamic test measurements). Only 5% of piles had damage when pile shoes were used versus 46% without shoes. When piles were driven through frost without pre-drill 83% were damaged. Design curves using a modified API method provided a capacity ratio of 1.0 for dynamic tests during pre-construction versus a range of 0.4 to 0.9 during construction. It was found that at a remote site there is more value-added increasing the installation and loading test programme scope versus the subsurface investigation. Also, when using an API design approach, extrapolating to diameters and lengths other than those tested led to skewed results; the general trend was over-conservative design for smaller diameter piles and under-conservative design for larger diameter piles as relative depth increased.
Lessons from Test and Production Programmes for Driven Piles in Sand
This case study outlines an installation and loading test programme conducted for foundation design at an oil sands mine in Alberta, Canada. Design was for approximately 10,000 driven steel piles of various sizes founded in dense glacial deposits of sand and silty sand. Included are results from pre-construction loading tests (9 static axial tests, 56 high strain dynamic test measurements) and construction QA/QC (7 static axial tests, 5% of piles with high strain dynamic test measurements). Only 5% of piles had damage when pile shoes were used versus 46% without shoes. When piles were driven through frost without pre-drill 83% were damaged. Design curves using a modified API method provided a capacity ratio of 1.0 for dynamic tests during pre-construction versus a range of 0.4 to 0.9 during construction. It was found that at a remote site there is more value-added increasing the installation and loading test programme scope versus the subsurface investigation. Also, when using an API design approach, extrapolating to diameters and lengths other than those tested led to skewed results; the general trend was over-conservative design for smaller diameter piles and under-conservative design for larger diameter piles as relative depth increased.
Lessons from Test and Production Programmes for Driven Piles in Sand
Noble, Kyle D. R. (author) / Martin, Kimberly K. (author)
GeoCongress 2012 ; 2012 ; Oakland, California, United States
Full-Scale Testing and Foundation Design ; 376-391
2012-03-29
Conference paper
Electronic Resource
English
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Capacity of Piles Driven into Dense Sand
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