A technical note by Tim that appeared in the December 2010 issue of the DFI Journal has been added to our publications page. Tim’s note examines some issues related to axial load testing of augered cast-in-place (ACIP) piles, also know as augercast piles or CFA piles, that are not covered in ASTM D 1143/D 1143M-07 Standard Test Methods for Deep Foundations Under Static Axial Compression. Specifically, load hold time, unload-reload cycles, and fluctuations in incremental load are discussed as they relate to load testing for determining axial capacity or axial load distribution of ACIP piles. Details of instrumented ACIP pile load testing are also covered.
DFI requests that the following be included with all DFI papers we post:
“This paper was originally published in DFI’s bi-annual journal, Volume 4, No. 2 in December 2010. DFI is an international technical association of firms and individuals involved in the deep foundations and related industry. The DFI Journal is a member publication. To join DFI and receive the journal, go to www.dfi.org for further information. ”
The new I-70 bridge over the Mississippi River near St. Louis, Missouri is quite the project. When completed, it will be the third longest cable-stayed bridge in the United States, with a 1,500-ft main span. Most significantly for the geotechnical community, the bridge made history when one of its 11-ft diameter drilled shafts resisted a world record breaking 36,000 tons (bi-directional) during an O-cell load test. The bridge has already seen press in Civil Engineering Magazine(July 2010, page 30-32), at ENR.com, and in a post by Robert on this blog. Now, an article by DBA’s Paul Axtell is featured in the September/October issue of Foundation Drilling Magazine. The editor summarized the article saying:
The information in the following article is a composite of material that came to Foundation Drilling Magazine from three separate sources. Part I is based on information gleaned from an article that was published on the Associated Press news wire. Part II is excerpted from ENR’s August 18th, E-Newsletter. Part III was provided by Paul Axtell and Dan Brown of ADSC Technical Affiliate company, Dan Brown and Associates. The bridge project is of interest in general. The Osterberg Load Cell test will be of particular interest to professionals in the deep foundation industry, and specifically for those who work in the drilled shaft segment.
I have updated our calendar for 2010 to include many events in the geotechnical and foundation engineering world that may be of interest, plus known speaking/teaching appearances by Dan. I’ll put in a plug for the events calendars and listings for ADSC, DFI, Geo-Institute, and PDCA. I get most of my information from them.
Work by DBA is all but compete on the kcICON project. All drilled shafts have been installed and base grouted. Construction of the shafts went very well, with no significant issues. Hayes Drilling installed all of the land-based shafts. AFT performed all of the base grouting.
The main pylon in the river continues to take shape. It won’t be long before PCC will have it looking like a bridge!
Paul has been “enjoying” observing drilled shafts at night and base grouting during the day. A collection of some of his photos from the last bits of shaft construction are below. He got some great shots of the pylon, including some out in the river.
I had the pleasure of making two trips to the Audubon Bridge site in April to help Steve. I got to observe the excavation of two of the shafts on the West High Approach (on land!), observe base grouting of some of the West High Approach shafts, and base grouting of the test shaft on the East High Approach. While there, I got to see both of the river pier cofferdams. They were something else to see with all of the bracing and sheet piles. I did not get to see them installed, but I understand it was quite an interesting process as the cofferdams were “jacked down” into place. While I was there, they were cutting of the permanent casing that sticks up above the seal slab of the pier.
Last week’s International Foundation Congress and Equipment Exposition was a huge success! Dan gave a keynote address on Tuesday on managing risk in deep foundations within the design-build delivery model. Paul, Erik, and I also had papers to present. The technical sessions were excellent, the indoor exhibits were excellent, and the outdoor exhibits of foundation equipment were outstanding! The ADSC, Geo-Institute, and PDCA were the co-organizers of the event. A big hats off to all of the staff of all three organizations that made the event a huge success! Thanks and “atta boy” go to Mohamad Hussein, P.E. (Conference Chair) and to Dan (Technical Program Chair) for all of their work, as well as the rest of the organizing committee.
I have been too busy to post more photos from my trips to New Roads, LA in the fall to help Steve with the work at the Audubon Bridge project. It has been a flurry of activity as they worked to finish installing, tip-routing, and load testing all of the shafts in the river (done in December!). They have also completed and tested the land test shaft on the west side of the river and begun installing the land shafts. Throw in a lot of pile driving, including some 5-foot diameter pipe piles for temporary bents, and it has been a very busy site. All of the various tip-grouting, O-cell load tests on drilled shafts, and PDA testing of the pre-cast piles has been successful. As of today, the Mississippi River has come up and slowed things down a bit, but they should get all of the foundation completed within the next couple of months.
Some pictures I took on some of my trips are setup below. I have also experimented with embedding some video I took with my camera. The camera was not set on a very high video capture resolution, but I think they are good enough for you to get the idea of the shaft excavation and the pile driving activities.
11/30-07 Update! – GEC No. 8 is now up on the FHWA web site. You can download it here.
Yes, folks, GEC 8 is finally complete! The publication version of Geotechnical Engineering Circular No.8: Design and Construction of Continuous Flight Auger Piles will soon be available from the FHWA Geotechnical Web Site. If you want an official sneak peek at GEC 8, just click here to get the PDF (approx. 10 MB). This circular is part of FHWA’s efforts to implement the use of CFA piles as a viable foundation alternative for transportation structures. We’ll post a notice when GEC 8 is on the FHWA web site.
I’ll have links to the conference web site once it is up and running, as well as blogging additionla information when available. This promises to be a great conference much like the 2004 Geo-Support Conference.
” The seminar will be held by the ADSC Northeast Chapter on November 14, in East Elmhurst, NY,at the Wyndham Garden Hotel, located at LaGuardia Airport. Eleven presenters drawn from the ranks of the nation’s top design, construction and testing practitioners will cover drilled shaft design, specifications, construction, concrete design, testing, as well as geotechnical investigation, and remediation techniques. An opportunity to visit with exhibitors will add to the seminar’s value. Among the featured presenters will be Dr. Dan Brown, P.E., Auburn University; Silas Nichols of the FHWA; Dr. Bernie Hertlein, P.E., STS Consultants; and Fred Rhyner, P.E., Mueser Rutledge. Internationally prominent design engineer Clyde Baker, STS Consultants will moderate a Q&A Panel. PDH credits are offered. For information including registration details, contact Ralph Capelli, 712/353-9616 or firstname.lastname@example.org.”