STGEC 2006 presentations posted

We have posted Adobe PDF handout versions of the presentations made by Dan, Steve, and Robert at the recent 2006 Southeastern Transportation Geotechnical Engineering Conference in Florence, Alabama. Dan spoke about high performance concrete for drilled shaft foundations, Steve spoke on the use of tip-grouted drilled shafts on the John James Audubon Bridge in Louisiana, and Robert spoke about the test pile program for the US 90 bridge over Biloxi Bay in Mississippi. Click on the images below to get to the files.

High Performance Concrete and Drilled Shaft Construction - STGEC 2006.png Tip Grouted Drilled Shafts for the Audubon Bridge - STGEC 2006_small.png US 90 Biloxi Bay Bridge Test Pile Program - STGEC 2006_small.png


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Presentation handouts now available

We will provide through this website Adobe PDF versions of handouts from presentations made by the DBA team at various conferences. These are being provided for information for folks who attended a presentation or heard about one and wanted to have better notes for future reference. The material may not be used for any other purpose without prior written permission from Dan Brown and Associates, LLC.

The images below will take you to two previously posted files.

BD Stadium Drilled Shaft Load Test - ADSC GEO3 Dallas Nov 05.png Axial Capacity Drilled and Driven Piles - PDCA 10th Conf March 06.png

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Happy Karl Terzaghi’s Birthday!

Today marks the 123rd year since the birth of the Father of Modern Soil Mechanics, the Sultan of Soils, an Engineer’s Engineer: Karl Terzaghi! So let us raise our coffee mugs (or whatever vessel contains your morning beverage of choice) this morning in honor of the man that helped define what we do as a field unto itself in civil engineering. Later this evening, after you have spent another great day as a geotechnical engineer teaching students, visiting a site to observe or test foundation construction, performing settlement analysis, telling that architect yet again why he can’t use shallow foundations for his 10-story building like he planned, working like crazy to finish that bid on a complex _____ (pile, shaft, soil nail, etc.) installation, or figuring out how to handle the outrageous axial and lateral load combinations the structural engineer gave you this week, raise a toast of beer, wine, or other beverage of your choice to Professor Terzaghi and his work. You got to spend another day in the most fun and exciting field in civil engineering (really, who wants to sit at a desk designing moment connections all day?).

To reflect on the contributions of Professor Terzaghi, click here to go to an on-line reprint (by permission) of an article by Dr. Richard Goodman, P.E. from the October, 2002 issue of Geo-Strata.

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Geoengineer.org Website Link

We have added a link in our Links section to Geoengineer.org, a website resource for geotechnical engineers. Resources include an on-line technical library and an on-line photo gallery/library. They have several new information servces, including the Geoengineer.org Press Center that has the latest news of articles and press releases of interest to geotechnical engineers, and The International Journal of Geotechnical Case Histories– a new, free on-line journal. Check it out!

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Drilled Shaft and Pile Foundation Presentations Scheduled for 2006 Southeastern Transportation Geotechnical Engineering Conference

Dr. Dan Brown, P.E. and Mr. Robert Thompson, P.E. are scheduled on the program for the 2006 Southeastern Transportation Geotechnical Engineering Conference in Florence, Alabama October 30th – November 3rd, 2006. This is the 38th STGEC meeting and is being hosted this year by the Alabama Department of Transportation. Dan will make two presentations: “High Performance Concrete for Drilled Shaft Construction” and “Design of Tip-Grouted Drilled Shaft Foundations for the John James Audubon Bridge.” Robert will make a presentation titled “Test Pile Program for U.S. 90 Bridge Reconstruction over Biloxi Bay.”

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Pile Load Tests on US 90 Biloxi to Ocean Springs

The week of August 28th saw five load tests performed at the project site. A lateral Statnamic test and an axial Statnamic test were performed on both 24-inch and 30-inch piles. The tests were performed by AFT. A picture of one of the axial test setup is below. A static axial load tests was also performed on a 24-inch pile. Eustis Engineering, the project geotechnical engineering firm, supervised the static test. The results of the tests, along with the PDA data gathered by Eustis during driving of the indicator piles, will be used to set the pile tip elevations along the bridge alignment. Driving of production piles is set to begin the week of September 11th.

US 90 Biloxi Bay 24-in Stat test 060831 015.jpg

Statnamic test setup on 24-inch pile.

Driving Indicator Piles in Biloxi Bay

I made a visit to the US 90 Biloxi to Ocean Springs bridge site on Thursday and was able to observe the driving of one of the indicator piles. This is a 30-inch precast prestressed concrete pile that will also be used for a Statnamic lateral load test. The axial and lateral load tests will begin later this month, with production piles planned to start in mid-September.

US 90 Biloxi Ind Piles 060810 026.jpg US 90 Biloxi Ind Piles 060810 037.jpg US 90 Biloxi Ind Piles 060810 051.jpg

The left photo shows the barge set up for driving. This pile was adjacent to the bascule span of the destroyed bridge. The middle and right photos are during pile driving. A air hammer is being used to drive the pile.

Audubon Bridge and US 90 Bridge Updates

DBA’s work on the John James Audubon Bridge in Louisiana continues to move forward.  We have submitted our reports for the main river piers that include the recommended designs for post-grouted drilled shafts.  Test shaft construction is scheduled for late August or early September for an Osterberg Cell (O-Cell) load test.

Driving of indicator piles has begun at the US 90 Bridge from Biloxi to Ocean Springs, Mississippi.  A program of 21 indicator piles and 6 load tests (4 axial and 2 lateral) will be used to develop pile capacities and driving criteria for the project.  Eustis Engineering, Inc. is monitoring all indicator and test piles using the Pile Driving Analyzer (PDA).  The load tests will be performed using the Statnamic device in late August.

Specialists in Deep Foundation Design, Construction, and Testing and Slope Stability Problems