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San Francisco Millennium Tower Has Settled 16 Inches
Misrepresents actual foundation geometry. Photos show deep excavation to ne
New FHWA Soil Nail Manual Addresses LRFD, Hollow Bars
Good evening from Barcelona, Spain. I am witting to you because of I am le
Engineering Geologists vs Geological Engineers vs Geotechnic
Geological engineer from Spain (looking for job smiley geoengineer.martin@gmail
A Whole Lotta Shakin' Goin' On: Center for Geotechnical Mode
Randy, While the UC Davis lab is impressive I believe the USACE Centrifuge
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Norway wants to build world's first tunnel for ships PDF Print E-mail
Written by Randy Post   
Tuesday, 07 May 2013 23:28
This computer generated picture shows the so-called Stad Ship Tunnel. Picture: AFP /Stadskipstunnel.no/NORDWEST3D

The Norwegian government wants to build a tunnel linking two fjords that would be large enough to pass 16,000 tonne cargo and passenger ships. The treacherous stretch of waterway has seen 46 accidents and 33 deaths since World War II. The 1.7 km Stad maritime tunnel would cost about 1.6B kroner ($274M USD). [Source: The Courier-Mail via ASCE SmartBrief. Image: AFP]

 
Video: Accelerated bridge construction Iowa DOT project PDF Print E-mail
Written by Randy Post   
Thursday, 18 April 2013 17:50

Massena Lateral Bridge Slide, 3D rendering of proposed bridge.

This video for the Massena Lateral Bridge Slide from Iowa DOT shows a very nice 3D rendering of the entire accelerated bridge construction process. They are using a lateral slide method to construct the bridge adjacent to the existing one and then slide it into place within 9 days.  From a geotechnical perspective, this bridge will be founded on driven piles, and then pre-cast abutment caps with CMP block-outs will be placed over the piles and the block-outs grouted up.  The wingwalls will also be precast with the CMP block-outs and supported on driven piles as well.  There will also be a driven pile temporary support structure, and driven piles will be used for the reaction frame to attach the threaded anchor rod used to jack the bridge into place.

Source: Iowa DOT via Rebuilding America's Infrastructure via ASCE SmartBrief. Image:  Iowa DOT

Massena Lateral Bridge Slide from Iowa DOT on Vimeo.

Last Updated on Thursday, 18 April 2013 13:10
 
DC Water Christens TBM "Lady Bird" PDF Print E-mail
Written by Randy Post   
Wednesday, 17 April 2013 23:34

Lady Bird, the new TBM that will tunnel under the Potomac River for DC Water

The District of Columbia Water and Sewer Authority (DC Water) recently christened a new Tunnel Boring Machine 'Lady Bird' in honor of former first lady Claudia Alta 'Lady Bird' Taylor Johnson. The roughly 23-ft diameter TBM will tunnel a total of over 24,000 feet at a depth of 100 feet below the Potomac and Anacostia Rivers as part of a DC Water project aimed at reducing combined sewer outfalls. I first posted about this project, including a Google Map of the route a few years back. [Source: More at Tunnel Business Magazine. Image: Tunnel Business Magazine]

Last Updated on Thursday, 18 April 2013 08:11
 
Video: WSDOT Rock Blasting on I-90 Snoqualmie Pass PDF Print E-mail
Written by Randy Post   
Wednesday, 17 April 2013 06:26

This is a great video montage of rock blasting for Washington State DOT's I-90 Snoqualmie Pass project. It's not clear from the description if this blasting actually occurred on this project or its from other projects meant to give Washington drivers a preview of what will be going on this summer on the project. All that's missing is a little classical music, perhaps 1812 Overture?

 
Bertha tunnel-boring machine arrives in Seattle PDF Print E-mail
Written by Randy Post   
Thursday, 11 April 2013 23:28
Vessel carrying the 57-foot diameter TBM named Bertha

The world's largest Tunnel Boring Machine or TBM just arrived in Seattle last week from Japan. Hitachi Zosen Corp built the 57 foot diameter TBM and tested it before disassembling it for the journey by boat to the Port of Seattle. Bertha will soon begin it's 16 month journey to bore a tunnel to replace the famous Alaskan Way Viaduct along Seattle's waterfront. [Source: Puget Sound Business Journal via ASCE SmartBrief. Image: www.bizjournals.com/]

 
Geopier ground improvement supports plant to turn cheese byproducts into green energy PDF Print E-mail
Written by Randy Post   
Monday, 08 April 2013 23:29

GreenWhey plant under construction in Turtle Lake, Wisconsin

Green energy from cheese? That's right, whey is not just for Miss Muffett I guess. In 2011, Foundation Service Corporation, the licensed installer of GeoPier GP3™ systems in Wisconsin installed over 1,600 GeoPier elements to stiffen the poor subgrade soils at a GreenWhey Energy plant under construction in Turtle Lake, Wisconsin.

Upon completion this summer, the plant will take byproducts from cheese production and use it to create biogas, heat and clean water. According to GreenWhey the biogas will eventually generate enough electricity to power 3,000 homes. Renewable energy from cheese.

[Source: Ground Improvement Engineering. Image: Ground Improvement Engineering]

 

Last Updated on Tuesday, 09 April 2013 06:31
 
Video: CA Devil’s Slide Bypass Tunnels Finally Open PDF Print E-mail
Written by Randy Post   
Tuesday, 26 March 2013 22:37

California motorists can now avoid a dangerous and landslide-prone stretch of the Pacific Coast Highway, Devil’s Slide, through the tunnel bypass. This project has been a fascination of mine since the early days of GeoPrac.  It’s fun to see it finally complete!

Last Updated on Tuesday, 26 March 2013 22:41
 
Study: Port of Alaska Sheet Piles Have Design Flaws PDF Print E-mail
Written by Randy Post   
Monday, 25 March 2013 23:24
The Port of Anchorage in 2010

A study by CH2M Hill commissioned by the Municipality of Anchorage found that the partially constructed open-cell sheet pile system is "not adequately designed to meet global stability and seismic displacements based on the design criteria." The results of the $2.2M study by CH2M Hill are documented in two reports and the findings were presented to a March 8 Anchorage Assembly meeting. The Municipality will now hire a third party to review the reports and CH2M Hill's recommendations for how to complete the project. The new design could cost up to $600M to construct. The Municipality took the project over in 2011 from the U.S. Maritime Administration after damage to some sheet piling was encountered. [Source: Alaska Journal of Commerce via ASCE SmartBrief. Image: Andrew Jensen/AJOC]

 
The Historic Role of Geotextiles in the Dutch Delta Works and the Geosynthetics Field PDF Print E-mail
Written by Randy Post   
Sunday, 17 March 2013 23:33
Eastern Scheldt Storm Surge Barrier in the Netherlands

TenCate geosynthetics was a textile technology company in 1953 when disastrous flooding struck the Netherlands. The company came up with some of the first applications of geosynthetics that allowed the creation of the Oostershelde Flood Barrier, a massive dam supported by 66 concrete pillars, each of which is roughly 40 meters high. TenCate is celebrating the 60 year anniversary of this achievement and Geosynthetica has an infographic showing more about the Dutch Delta Works flood control project and TenCate's role. [Source: geosynthetica.net. Image: Architecture.about.com]

 
Rome Colosseum at risk from subway expansion - activists PDF Print E-mail
Written by Randy Post   
Sunday, 10 March 2013 14:59

Western side of the Colosseum or Flavian amphitheatre, 70/72 - 80 DC in Rome. By Jean-Pol GRANDMONT

Members of an Italian herritage association claim that tunneling 50 meters below the streets of Rome would put the Roman Colosseum at risk of collapsing. Here is an excerpt from the article I found:

"The Colosseum is at risk," heritage association Italia Nostra said in a statement. "Nobody at the moment can guarantee that the Colosseum's foundations will not be affected by the deep excavation of land just dozens of meters away from the monument," it added.

 

This is certainly an interesting problem, but as a geotechnical engineer, I'm not so sure that it would be impossible. Certainly any tunneling or excavation would require monitoring and perhaps more active measures to ensure that nothing happens to the Colosseum, but it seems like this is more of a political statement than a technical one. [Source: IOL.co.za. Image: Wikipedia, Jean-Pol GRANDMONT]

Last Updated on Monday, 11 March 2013 06:20
 
NAVFAC Southwest Awards $4.5 Million Contract for Geotechnical Engineering Service PDF Print E-mail
Written by Randy Post   
Monday, 25 February 2013 23:29
Naval Facilities Engineering Command or NAVFAC

Naval Facilities Engineering Command (NAVFAC) Southwest awarded RORE Inc. an IDIQ contract worth $4.5 million for geotechnical consultation, subsurface investigation, and material testing for various projects. NAVFAC Southwest's area of responsibility includes California, Arizona, Colorado, Nevada, New Mexico, and Utah. The majority of work is anticipated to be completed in California. [Source: NAVFAC. Image: Pipkins Construction]

 
Video: Golder’s Tunneling Solution in Toronto for Difficult Ground Conditions PDF Print E-mail
Written by Randy Post   
Friday, 22 February 2013 06:20

Golder Associates posted the video below describing some of their work on the York University Subway Tunneling Test Monitoring Project, part of the larger Toronto-York Spadina Subway  Extension Project in Toronto, Ontario, Canada.  The tunnels came within 6 meters of a “show-piece” building on the York University campus, and the stakeholders were nervous about possible damage to the building.  Golder designed an instrumented tunnel test section in advance of the segment under the building, allowing monitoring of the tunneling techniques and potential ground loss so that the team could eventually green-light the dual tunnels under the building. [Editor] Disclaimer: Golder Associates is my day-job employer.  They are not affiliated with GeoPrac though. [/Editor]

[Update 2-25-2013] Some of the Golder Marketing folks wanted to tweak the video, so it will be removed for a few days.  Once someone tells me the new version is up, I'll embed it once again.  Sorry about that! [/Update]

Last Updated on Monday, 25 February 2013 14:23
 
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