ADSC Lawrenceville Test Site–We Have Winners!

That’s right load test fans, The results are in! The ADSC Southeast Chapter is proud to announce the “winners” from the prediction contest for the Lawrenceville, GA test site. In the table below, we have listed the winner and their prediction. The winners are the closest to the average measured values as reported by Loadtest, Inc and may not represent the reported maximum values recommended in the final report by DBA. We won’t release the final report until the ASCE Georgia Section Geotechnical Group meeting November 15, 2011 at 6:30pm at the Georgia Power Company’s Headquarters in Atlanta. Dr. Brown will be presenting the findings then – so come to the meeting and get it first, or look to the DBA or ADSC web sites after November 15th to get the report.

 

Shaft

Name

Prediction

1 – Unit Base Resistance

Gloria Rodgers
(Building and Earth Sciences, Inc.)

750 ksf

1 – Unit Side Resistance

Todd Barber (Geo-Hydro Engineers, Inc.)

50 ksf

2 – Unit Base Resistance

Todd Barber (Geo-Hydro Engineers, Inc.)

690 ksf

2 – Unit Side Resistance

TIE:
Jim Pegues (Southern Company Svcs.)
Tom Scruggs (Georgia DOT)

3 ksf

Happy Karl Terzaghi’s Birthday 2011!

Greetings to all Terzaghi fans!  Yes, it is that time of year again, where our thoughts turn to the anniversary of the birth of one of the greats in our field.

Last year I had a football themed post (college football, in case you were wondering…and that is American football for our fans outside the U.S.) since Terzaghi’s birthday was on a Saturday. Since I am not a big pro football fan, and since I used football last year, I figured I would do something different for this year’s weekend post.

The August 2011 edition of the International Society for Soil Mechanics and Geotechnical Engineering ISSMGE Bulletin is headlined with an article on the history of ISSMGE: “THE ISSMGE FROM 1936 TO 2011 A RETROSPECTIVE ON THE OCCASION OF THE 75TH PLATINUM JUBILEE ANNIVERSARY” by Kenji Ishihara and Michele Jamiolkowski. The Bulletin is in two parts at this link. The article is an outstanding work providing an excellent account of the start of ISSMGE as an international conference and its evolution into the ISSMGE we know today.

It should be no surprise that Prof. Terzaghi was very active and one of the key figures in the formation and success of ISSMGE, which began as the International Conference on Soil Mechanics and Foundation Engineering (ICSMFE). Many of the giants of soil mechanics and geotechnical engineering on which we base al of our work were instrumental in the start of ICSMFE and its impacts on our profession. As for that time in history (1936) and how it was important to our field:

The time had come to hold a Conference aimed at exchanging and sharing information on Earth and Foundation Engineering.

It was Professor Arthur Casagrande (assistant professor of Harvard University) who sensed the timing, conceived the idea and carried out the herculean task of running the conference all the way through, in his role of Secretary General, with K. Terzaghi (Professor of Technical University of Vienna and visiting Professor of Harvard University) as Chairman. Professor Peck once remarked “Our Society owes an enormous debt to Arthur Casagrande for his conviction that the time was right for the International Conference and to his tremendous efforts to organize it“.

…

Since the first ICMSFE was so successful, it became clear that the Conference should not remain a one-off event but should, instead, be continued within a few years, possibly being held in Holland where earthwork engineering is so crucial to the country.

It was also requested to set up a permanent international organization. Thus it was decided to establish International Committees consisting of National Committees with K. Terzaghi as President and A. Casagrande as Secretary. It was also decided that at the next Conference the International Committees would submit the draft of the Constitution and of the By-laws, which are essential for the Society to become a permanent organization.

There was at that time a widespread awareness that it was the moment to set up a common denominator institution that would group engineers with diverse backgrounds but involved in our discipline.

Portion of group photo from 1st ICSMFE, 1936.  (From ISSMGE Bulletin Vol 5, No 4, August 2011, p3)

 

Photo of Terzaghi addressing the opening session of the 4th ICSMFE, 1957.  (From ISSMGE Bulletin Vol 5, No 4, August 2011, p7)

 

And the rest, as the saying goes, is history!

As an editorial note on the first year, Ishihara and Jamiolkowski offer this observation:

It is commonly recognized that K. Terzaghi is the originator of modern soil mechanics and foundation engineering and therefore father of our profession. After tracing the history of development, the writers had a strong belief that this is true. Not only was he always a leading figure in the forefront, but he conveyed strong messages on the role and importance of the soil mechanics and foundation engineering every time he participated in the ICSMFE. We are very much impressed by his enthusiastic and heartfelt message to our community.

No less important was the role played by Arthur Casagrande. He was instrumental in persuading the President of Harvard University to host the conference and carrying out all arrangements for organizing the first International Conference on Soil Mechanics and Foundation Engineering. The great success of this conference contributed greatly for establishing the place of soil mechanics in engineering practice throughout the world. He also dedicated himself to the ISSMFE as the 3rd President between the periods of 1961 in Montreal to 1965 in Paris.

There is a saying that for a great religion to be established, there always are two key-role playing giants. For Christianity Jesus Christ is the originator and his disciple Saint Paul was the great evangelist. For Greek philosophy, Socrates was the great philosopher and it was Plato who was the greatest disciple. Terzaghi and Casagrande are considered as a combination in the same context. Without Terzaghi, Casagrande would not have been so well-known. Had there not been Casagrande, the fame of Terzaghi would have developed in a different format.

Now neither I nor the authors are suggesting that soil mechanics is a religion, but their point on the timing and combination of Terzaghi’s and Casagrande’s work was critical to what we see as the field of soil mechanics/geotechnical engineering today. Without these two and others seeing a need, taking charge, and filling that need, we could very well be viewing things from a completely different framework.

So as we reflect on this celebrated day, let’s remember not only Prof. Terzaghi’s great technical achievements, but also his role as a leader (along with many others) shaping our field of practice and our professional societies.

GeoWorld: On-Line Community for Geo-Engineers Launches

geoworld1It seems that social media and on-line communications have become a major part of our day-to-day communications.  If you are like me (Robert), I find it rather annoying at times to filter through what you get to find what you really want or need.   Now there is an on-line social networking/community for the geoengineering field – GeoWorld.  This new “spot on the web” is a collaboration of Geoengineer.org and ISSMGE (International Society for Soil Mechanics and Geotechnical Engineering). 

After more than two years of development, Geoengineer.org, in collaboration with the ISSMGE, is pleased to announce the development of Geoworld!

Geoworld is a new, free, professional networking platform for professionals, companies and professional organizations in the geoengineering profession. It promotes professional networking, collaborations and information dissemination at a global scale.

Geoworld revolutionizes the way information is circulated and even generated in the geoengineering field. It will serve as a platform to promote professional interactions, foster the formation of formal and informal groups, and support innovation in the geoengineering field at a global scale. 

Geoworld is very easy to use and powerful, and has features that are specifically suited for geotechnical engineering professionals. Hundreds of geotechnical engineers as well as companies and organizations have already joined since the first announcement of Geoworld last week. 

Here is a video link introducing Geoworld.

Look for DBA and ask to become a Contact.  Also look for me and other DBA folks.  See you there!

Now Published! NCHRP Synthesis 418–Developing Production Pile Driving Criteria From Test Pile Data

nchrp_syn_418 - pile criteria from test pilesThe Transportation Research Board of the National Academies has published a National Cooperative Highway Research Program synthesis report by Dan and Robert: NCHRP Synthesis 418–Developing Production Pile Driving Criteria From Test Pile Data. This synthesis provides a survey of the current practices used by transportation agencies to develop pile driving criteria, with special attention on the use of test pile data. The report covers issues related to developing driving criteria, the current practices used by the responding agencies, recommended useful practices that were identified, along with descriptions of the practical approach several agencies use to integrate a range of technologies to develop pile driving criteria under typical conditions. The information collected indicates that practices used by transportation agencies to develop pile driving criteria for production pile installation can be described as highly variable in terms of the level and sophistication of the testing performed.

Included in the report are:

  • Responses from a survey sent to all 50 state departments of transportation plus the District of Columbia and Puerto Rico (44 of the 52 agencies provided responses).
  • Interviews performed by telephone or in-person of nine of the responding agencies selected based on the written survey responses.
  • A comprehensive literature review on the range of practices included in test pile programs and their use in developing production pile driving criteria.
  • Discussions of the survey results.
  • Useful practices identified from the surveys.
  • Identification of research needs for this topic.

To purchase the print version of this report or get a PDF, follow this link to TRB.  Click the “View This PDF” to get the PDF.

Please note that if you order the printed version,  Appendices B and C (copies of the completed survey forms and interview notes) are available via download only.

Dan To Receive 2011 DFI Distinguished Service Award

Dan will be honored at the DFI 36th Annual Conference on Deep Foundations in Boston, October 19 to 21.  He will receive the award at the annual awards banquet on Thursday, October 20th.  From DFI:

The Deep Foundations Institute is pleased to announce Dan Brown, P.E., Ph.D., as the recipient of the DFI 2011 Distinguished Service Award. The award, in its 31st year, honors individuals chosen by their peers for exceptional contributions to DFI and to the industry.

Brown began his career with a B.S. from Georgia Tech, and later received his Ph.D. at the University of Texas, Austin, in only 28 months, while working. He then taught at Auburn University for 22 years before setting up his own consulting firm in Tennessee. The Winter 2011 issue of the DFI magazine included a profile of Brown that chronicled the universal admiration and regard for him within the industry. He was cited by others for his expertise, his intelligence and ability to teach others. Brown and his firm are sought out for advice everywhere.

Follow this link to see the full press release.  We’ll post pictures after the ceremony.

Simplified Settlement Model–DFI Journal Technical Note by Tim Siegel

DFIJv5No1Tim has authored a Technical Note in the most recent issue (June 2011) of the DFI Journal.  The note is entitled “Simplified Settlement Model for a Shallow Foundation on Composite Ground with Rigid Piles”.  From the Abstract:

A piled raft refers to a shallow foundation that is structurally connected to the piles, while composite ground refers to a soil-pile matrix where the piles are not structurally connected. The design objectives for both a piled raft and composite ground are (excluding special considerations such as expansive soil): (1) to provide a sufficient ultimate resistance and (2) to distribute the load into the soil-pile matrix so that the settlement experienced by the shallow foundation is within tolerable limits. A simplified model is proposed for a shallow foundation on composite ground where the foundation settlement is estimated as the sum of the downward movement of the piles plus the downward movement of the shallow foundation relative to the pile head. The proposed simplified
model is applied using conventional geotechnical analyses for two hypothetical examples of shallow foundations undergoing compression settlement.

This paper was originally published in DFI’s bi-annual journal, Volume 5, No. 1 in June 2011.  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. ”

You can also subscribe to the DFI Journal here.

Audubon Bridge–Cofferdam Construction Article

LA-Civil-Eng-JJABridge

As noted earlier on this blog, the Audubon Bridge opened a little bit earlier than planned.  Although over a year old, an article recently came to my attention that puts a spotlight on the unique engineering and construction that went into the cofferdams for the two main bridge piers in the Mississippi River.  The article is “John James Audubon Bridge Project – Cofferdam Construction for the Main Span Pier Foundations”, published in the February 2010 issue of Louisiana Civil Engineer, the Journal of the Louisiana Section of the American Society of Civil Engineers.

The article’s lead author, Sereno Brown, P.E., was the construction team’s Project Engineer for the design-build project.  In the article, Mr. Brown outlines the issues that led to the team selecting a pre-cast concrete cofferdam over other methods, the design methodology, and then the construction of the cofferdam.  The effort posed several significant design and construction challenges, including the sequence of lowering the cofferdam into place through a set of hydraulic jacks. The entire process was truly an amazing engineering and construction feat.

Download the article here.

ADSC Lawrenceville Test Site–Prediction Contest!

Update (7/31/11) – Field Day set for Thursday, August 18th – More info here!

Back by popular demand, we will hold a prediction contest for the second test site in the ADSC drilled shaft research project for rock sockets in the Southeastern U.S.  Contestants are encouraged to download the information linked below and then submit their predictions of unit side resistance and base resistance that will be measured by the O-cell tests.  The winner will be announced at the field test and demonstration day on site, as well as published in this blog along with all submitted predictions.

Two test shafts will be installed July 26 – 29th at the yard of Foundation Technologies, Inc. One will include a rock socket to attempt to test side and base resistance in the rock socket.  The other shaft will be drilled to “rock auger refusal” to attempt to test side resistance in the partially weathered rock (locally termed PWR) and base resistance at “rock auger refusal”.  In the Piedmont area, the highly weathered upper rock zone is commonly called PWR.  Another common usage is “rock auger refusal” to define where “hard rock” begins.  It is thought that designers may be overly conservative with base resistance values at “rock auger refusal”.  Hopefully this test will provide useful data in that regard.

Testing will occur during a field demonstration day in mid-August. We’ll post the date once it is finalized.

Information to include the test shaft configurations and exploratory boring data can be downloaded here.

The contest entry form along with instructions for submission can be downloaded here.

We will have Aaron on site to observe and take lots of pictures.  We’ll post his photos of the excavations as soon as we can (check the project web page soon after August 1st) to assist in making predictions.

All predictions must be submitted by the close of business, August 12, 2011.

For more information, visit the test site page.

Previous posts.

Drilled Shaft Article by Dan in Geo-Strata

Constructability Considerations When Designing Drilled Shaft Foundations for Bridges

The May/June 2011 issue of ASCE’s Geo-Strata focuses on bridge geotechnics.  Dan contributed an article to this issue summarizing key constructability considerations for bridge drilled shaft designers.  Specifically, the article focuses on fresh concrete properties and reinforcement design.  Discussion of self consolidating concrete (SCC) and column-shaft connections is also included.  The article has been added to our publications page and is available through the link above.  Additional details related to bridge drilled shaft constructability can be found in the 2010 FHWA Drilled Shaft Manual here.

Audubon Bridge Opened To Traffic (earlier than planned!)

The John James Audubon Bridge was opened to traffic on May 10, 2011 a little earlier than planned.  While the project is not 100% complete, the bridge was sufficiently complete to allow an emergency opening due to closure of the nearby ferry the bridge is replacing.  From the project website:

Due to the high level of the Mississippi River causing the closure of the New Roads/St. Francisville ferry, the Louisiana Department of Transportation and Development (DOTD) opened the John James Audubon Bridge at 10 a.m. on Thursday, May 5, 2011. This emergency opening allowed continuous river-crossing access for traffic affected by the ferry closure. The ferry, which carried approximately 720 vehicles per day according to 2009-2010 DOTD statistics, is permanently closed with the opening of the Audubon Bridge.

Construction is still ongoing and could affect traffic until the project is 100% complete later this year.

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