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San Francisco Millennium Tower Has Settled 16 Inches
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Site Characterization Services: Step 4 Laboratory Testing PDF Print E-mail
Written by Randy Post   
Tuesday, 26 January 2016 07:26

This video in Terracon's video sequence on site characterization discusses lab testing. [Source: Terracon YouTube Channel. Image: YouTube]

Last Updated on Tuesday, 26 January 2016 14:29
 
GBA Issues New Report-Review Guide PDF Print E-mail
Written by Randy Post   
Wednesday, 13 January 2016 23:03
GBA Guide to the In-House Review of Geoprofessional Reports

The Geoprofessional Business Association has released a new guide document on the In-House Review of Geoprofessional Reports. The document has information for report writers and reviewers with a 'focus on a report’s ability to satisfy the contractual obligations it was intended to fulfill; the quality of its technical and risk-management content; and the clarity of presentation.' Read more at the link below. As with most GBA documents, it is free for GBA member firms. [Source: Geoprofessional Business Association. Image: GBA]

 
Recorded Webinar - Geotechnical Aspects of Polyurethane Grouting PDF Print E-mail
Written by Randy Post   
Sunday, 20 December 2015 11:53

I gave a presentation recently on a monthly webinar for URETEK Holdings, one of the licensed affiliates (installers) of products by GeoPrac sponsor, URETEK ICR. The topic was Geotechnial Aspects of Polyurethane Grouting. I gave my perspective on some of the benefits of polyurethane grouting, the challenges in geotechnical characterization of the improvements to the soil after grouting, and some unique applications of the technology people are currently using and could potentially use in the future. If you have time to check it out, let me know your thoughts!

[Source: URETEK Holdings YouTube Channel. Image: YouTube]

Last Updated on Monday, 21 December 2015 04:17
 
Ground Freezing Goes Mainstream with Popular Mechanics PDF Print E-mail
Written by Randy Post   
Sunday, 20 December 2015 11:52

Moretrnch ground freezing technology at the Washington D.C. First Street Tunnels Project

GeoPrac sponsor Moretrench is a specialty geotechnical contractor known for their expertise with a variety of geotechnical construction methods. But they are probably best known for their niche work with ground freezing technology. Popular Mechanics Magazine recently did a story on Moretrench's ground freezing work at the Washington D.C. First Street Tunnels project. The ground freezing allowed three vertical access shafts and four deep adits to be excavated in the dry using the frozen ground support. [Source: Read more abot this interesting technology and project from Moretrench. Image: Moretrench]

Last Updated on Monday, 21 December 2015 04:16
 
2015 Terzaghi Lecture - The Evolution of Specialty Geotechnical Construction Techniques PDF Print E-mail
Written by Randy Post   
Sunday, 20 December 2015 11:52

The 2015 Karl Terzaghi award was presented by Donald A. Bruce, Ph.D., D.GE, C.Eng., L.G., L.E.G., President, Geosystems, L.P. at the Geo-Institute's 2015 Geo-Congress Conference. The Geo-Institute has generously made his lecture available to all of us on their YouTube Channel, so be sure and subscribe. From his abstract:

In historic literature, there is the "Great Man" theory, whereby history is reflected in the biographies of preeminent characters. In the more theoretical and academic branches of specialty geotechnical engineering, the theory holds true, with, of course, Professor Terzaghi one of the heroic great men – a researcher, problem solver, and inspiration sans pareil. In contrast, in the branch of specialty geotechnical construction, technological advances occur principally through "Great Leaps" as opposed to steady and progressive evolution.

Six criteria must be satisfied in support of awarding "Great Leap" status, beginning with a project-specific challenge of unprecedented scope or complexity, and ending with a legacy document detailing and codifying the leap. These steps are illustrated by reference to developments in drilling and grouting; cutoffs for dams; deep mixing; and micropiles, all techniques in which the author has been intimately involved throughout his professional career as a researcher, contractor, educator, and consultant.

 [Source: Geo-Institute YouTube Channel (be sure to subscribe!). Image: YouTube]

 

Last Updated on Monday, 21 December 2015 04:14
 
LogitEasy Offers Free iPad Promotion for Borehole Logging PDF Print E-mail
Written by Randy Post   
Monday, 07 December 2015 06:39

LogitEasy offers mobile geotechnical data collection and log preparation servicesLogitEasy provides a web-based solution for logging boreholes and wells.  You can send them scanned paper logs, or use their electronic form on a PC or iPad to submit the data to them.  For a flat fee per log, they will prepare electronic logs in gINT, LogPlot, or EnviroInsite (well log) formats and submit report-ready PDF logs and/or electronic data files.  They are currently offering a promotion through the end of 2015.  When you pre-purchase 99 logs, you get an iPad Air 2, a LifeProof rugged case, a mobile internet SIM kit, and a $100 mobile internet card.

Head over to LogitEasy.com and click on the banner at the top of the page for more info on the free iPad promotion.   The things I like about their approach to mobile geotechnical data collection is that you can build in the pricing into your project costs, and their solution works offline as well as online, so you can still log on the iPad at those remote project sites.

LogitEasy Fall/Winter Promotion - Free iPad for Borehole Logging

Last Updated on Monday, 07 December 2015 06:43
 
Site Characterization Services: Step 3 Field Exploration PDF Print E-mail
Written by Randy Post   
Monday, 05 October 2015 23:32

Another in the series of excellent videos by Terracon. This video addresses the field exploration techniques they use. [Source: Terracon YouTube Channel. Image: YouTube]

Last Updated on Tuesday, 06 October 2015 06:34
 
Terzaghi's Birthday 2015 and Growing Pains of a New Profession PDF Print E-mail
Written by Randy Post   
Friday, 02 October 2015 05:44

Happy Karl Terzaghi's Birthday!Today is the anniversary of Karl Terzaghi's birthday. I have a tradition of marking the anniversary by sharing a quote or some other piece of info I've learned about the man we commonly refer to as the father of soil mechanics and geotechnical engineering. This year I marked the occasion a day early by arranging for geotechnical engineers in my office of Golder Associates to watch a video over our lunch hour by The GBA from 1988 of a presentation given by Ralph Peck entitled "Growing Pains of a New Profession - Soil Mechanics 1925-1940".

It's always remarkable to me to think that we are only one generation, or at most two, removed from the men like Terzaghi that developed the theories and practices that form the foundation for our profession. Although Peck's presentation did not focus on Terzaghi entirely, he did note that in his opinion, there were three factors that marked the transition to what we know as modern soil mechanics in the United States.

 

The first of these was Terzaghi's establishment of the principles of the new science: the mathematical theory of consolidation and the acompanying recognition of effective stress, the deformation conditions controlling earth pressure, and the determination of numerical values for the pertinent physical properties of earth materials.

 

Peck discusses the contributions of many other names, some that I had heard of, a number that I wasn't as familiar with, and talks about some of the controversies, personality clashes and egos in the early soil mechanics community.  I recommend the video, or at least Peck's paper, to anyone interested in geotechnical engineering.  If your firm is a GBA member, you can get either for free (just create a free login at the GBA homepage, instructions for getting the video for free on Vimeo are listed in the description of the video).  Happy KTB everyone!

Last Updated on Friday, 02 October 2015 06:09
 
USBR Selects 23 Projects Totaling $5.2 Million to Build Drought Resiliency in Nine States PDF Print E-mail
Written by Randy Post   
Thursday, 17 September 2015 21:52
Drought resiliency grant awarded by the USBR

From the USBR Press Release:

Bureau of Reclamation Commissioner Estevan López has announced the selection of 23 projects to receive grants totaling $5.2 million for proactive drought planning and other efforts to build long-term drought resiliency in nine states in the West.

"The western United States has faced an unprecedented drought this year and will face many more water challenges in the future," Commissioner López said. "This funding will help the selected communities prepare for future droughts."

Through a competitive process, Reclamation selected 12 drought resiliency projects and 11 drought contingency planning projects in the states of Arizona, California, Colorado, Idaho, Nevada, Oklahoma, Oregon, Texas and Washington.
[Source: Read the full press release at the USBR. Image: Walnut Creek Magazine]

 
Site Characterization Services: Step 2 Methods Consulting PDF Print E-mail
Written by Randy Post   
Sunday, 13 September 2015 23:01

The second in a series of videos by Terracon on the various steps of site characterization. If you are someone new to geotechnical engineering, these videos are a great overview of what we do! [Source: Terracon YouTube Channel. Image: YouTube]

Last Updated on Monday, 14 September 2015 06:04
 
A Whole Lotta Shakin' Goin' On: Center for Geotechnical Modeling Facilitates Seismic Research PDF Print E-mail
Written by Randy Post   
Tuesday, 18 August 2015 05:15
Geotechnical centrifuge at the UC Davis Center for Geotechnical Modeling

How would you feel if you were subjected to 75Gs of centrifugal force? Well, at least you would know what the soil feels like in some of the cutting edge geotechnical modeling being done at the UC Davis Center for Geotechnical Modeling (CGM). This article is a fascinating overview of the history of the lab, and the types of geotechnical experiments they can run using the 9 meter radius centrifuge. It can spin a 5-ton payload at 90 revolutions per minute! No other lab in the world can boast those numbers. [Source: Read the full blog post from the College of Engineering at UC Davis. Image: UC Davis]

 
Video of DeWind One Pass Trenching MT2000 Trencher Installing Soil Bentonite Cutoff Wall PDF Print E-mail
Written by Randy Post   
Tuesday, 04 August 2015 00:20

Modified from the YouTube description: Video of a DeWind One-Pass Trencher installing a Soil-Bentonite Wall 55' deep. This is a mix in place technology capable of installations up to 125' feet deep. The soils are evenly homogenized with the additives from top to bottom and from start to finish. An Average of 300 LF installed per day. No messy mixing ponds, open excavations, very little spoils, One piece of equipment and only 4 men are required for this 5000 LF installation reducing safety exposure.

[Source: YouTube. Image: YouTube]

Last Updated on Tuesday, 04 August 2015 07:23
 
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