Blasting for the New York MTA's Second Avenue Subway project unexpectedly showered the street level with debris, damaging buildings. Fortunately there were no injuries. Some debris reached the height of a 5 story building. [Source: WSJ.com via ASCE SmartBrief. Image: WSJ.com]
The 2-year process of excavating the 3,389 foot long fourth bore of CALTRANS' Caldecott Tunnel is nearly complete. The tunnel is anticipated to be put into service in 2013 to help relieve a major traffic bottleneck in the San Francisco Bay area. [Source: ContraCostaTimes.com via ASCE SmartBrief. Image: Karl Mondon / San Jose Mercury]
For those outside the UK, the Crossrail project is a mega-project upgrade to the London metro area's subway system. The tunneling portion of the project will consist of 21-km of twin-bore tunnels excavated by eight closed-faced tunnel boring machines, six of which will be earth pressure balance machines (EPBMs). The UK's Geological Society has published an interesting article on the geology of the crossrail project. Some of the geological and geotechnical challenges of the project include the famous London Clay, sensitive structures, faults, and rapid transitions between permeable and relatively impermeable formations creating potential water pressure issues. [Source: Geological Society. Image: Geological Society]
Drilled shafts have been installed by Malcolm Drilling to form the secant pile retaining walls to support the 400 ft x 80 ft x 80 ft launch pit for the SR 99 tunnel boring machine on the Alaskan Way Viaduct Tunnel Replacement Project in Seattle. Excavation has commenced on the pit in preparation for the launch of a world record 57.5-ft diameter TBM (until Russia launches a planned 63-ft TBM). The Seattle Times article indicates there are a total of 1400 drilled shafts in the pit walls and nearby, but a press release by WSDOT indicates the walls are comprised of approximately 200 drilled shafts. [Source: Seattle Times via ASCE SmartBrief. Image: WSDOT Flickr]
70 boreholes were completed as well as 7 load test piles to characterize the geotechnical conditions for this well known bridge spanning the Hudson River in New York. No significant surprises were encountered compared to geotechnical recommendations in a draft environmental assessment report for the project according to the project manager for the State. [Source: LoHud.com via ASCE SmartBrief. Image: Wikipedia]
GeoPrac sponsor Nicholson Construction is working on one of the most challenging grouting jobs in the world right now. They are performing grouting in porous limestone formations under the shipping channel in Miami's Biscayne Bay as part of the Port of Miami Tunnel project. This grouting work was the featured article in the June 2012 issue of Tunnel Boring Magazine (Here is a link to the story in PDF format). They are being called to perform the work both onshore and offshore to depths up to 126 feet below grade, including inclined holes up to 146 feet deep. Environmental regulations are abig consideration, but even that pales in comparison to the logistical challenges of not impacting cruise ship traffic in the port. Make sure you read about this interesting grouting and tunneling project. [Source: Tunnel Business Online. Image: Tunnel Boring Magazine]
The Pakyong Airport in Himalayan state of Sikkim in North East India was selected as the 2012 International Project of the Year by Ground Engineering Magazine, a geotechnical engineering trade publication associated with the UK's New Civil Engineer organization. The highlight of the challenging Rup2560 M (Â£31M, US$48M) project is a series of geogrid reinforced slopes up to 74 m (243 feet) high. Maccaferriâ€™s Terramesh, Green Terramesh and Paralink soil reinforcement products were used extensively on the project. Mott Macdonald India was the main designer, and Punj Lloyd of Dehli was the contractor. Maccaferri Environmental Solutions Pvt Ltd was the division of Maccaferri responsible for the reinforced soil works. [Source: geosynthetica.net. Image: Geosynthetica]
Hersheypark is a famous amusement park in Hershey, Pennsylvania. The park looked to GeoPrac sponsor Nicholson Construction for micropile foundations for their new $12.5M Storm Runner roller coaster. The ground conditions consisted of highly variable karstic limestone. Read the project profile on Nicholson's website to see how they handled the design and construction of these micropile foundations. [Source: Nicholson Construction Company. Image: Nicholson Construction]
Sometimes you need a geotechnical pro more than a golf pro to improve your game.
As a golfer, mechanics are a vital part of how you play the game… however, soggy course conditions can affect your game just as much as your golf pro. Click through to see how URETEK alleviated soggy fairway conditions at a premiere course in Texas.
Lakeshore Engineering Services, Inc. of Detroit, MI has filed a lawsuit agains the Richmond (Kentucky) Utilites Board and HDR Engineering alleging breach of contract.
Among other claims, Lakeshore alleges Richmond Utilities committed a breach of contract and violated the Fairness in Construction Act. The company also claims both Richmond Utilities and HDR are guilty of negligent misrepresentations and supplying false information by stating in the contract that bidders could 'rely' on the information provided in the geotechnical report.
The claims center around bedrock encountered during the excavation for a wastewater treatment plant. The geotechnical report was not written by HDR, but by another engineering firm, Thelen Associates Inc. [Source: The Richmond Register]
Tensar announced that construction has started on $3 million worth of ARES MSE retaining walls on one of Ohio's largest highway projects. 200,000 square feet of the mechanically stabilized earth retaining walls will be built using Tensar's uniaxial geogrid reinforcement. [Source: Geosynthetics Magazine. Image: ODOT]
A geocell is a honeycomb-like geosynthetic structure that is filled with aggregate to create a strong, stable platform. The Florida DOT used Strata's StrataWeb product to solve a problem of soft shoulders on a bridge approach and create a stable, load-bearing shoulder without any pavement.