Subscribe to the Monthly Newsletter at GeoPrac.net, powered by Constant Contact.
GeoPrac.net is a community of practitioners of geotechnical engineering, geological engineering, engineering geology, geophysics, hydrogeology and related disciplines. We offer members and visitors the foremost collection of geo-related articles, news, and online resources to keep those geo-professionals in practice at the forefront of their respective fields.
There was a significant slope failure at the Yeager Airport near Charleston, West Virginia last week. A 2005 project to create an Engineered Material Arresting System (EMAS) at the end of the runway required a massive reinforced soil structure fill slope over 200 feet high since the airport was constructed on top of a hill. According to a presentation published by the geogrid manufacturer, this project was the tallest known geosynthetic reinforced 1:1 fill slope in North America (as of 2010). The slope failure follows a period of significant snow melt and rainfall. It is a deep-seated failure, apparently a compound failure that cuts through the reinforcement based on one of the photos available in the Charleston Daily Mail article cited in the article at the Landslide Blog. I'm sure there will be much more information about this massive failure in the coming months.
National Driller has a nice interview with the 2015 Terzaghi Lecturer, Donald Bruce, President of Geosystems. Bruce, best known for his expertise in grouting, will deliver his Terzaghi Lecture at this week's IFCEE conference in San Antonio. [Source: Read the interview at National Driller. Image: National Driller]
Advanced Construction Technology Services (ACTS) has contracts for geotechnical work for 3 lines of the proposed subway in Doha, Qatar. They have completed investigations for approximately 95 km of line and 51 stations and are currently working on the recommendations for track designers. The contract for the these services is worth approximately $1.37 million. [Source: Trade Arabia. Image: Trade Arabia]
EarthScience Information Systems (ESCIS) is pleased to announce the release of the Shoalhaven City Council Aqua Data website, a branding of the ESdat Public Portal.
Aqua Data is a web-portal providing greatly enhanced community access to the results of water quality monitoring completed by Shoalhaven City Council (SCC). Aqua Data is the public interface of a detailed system designed to streamline the way SCC manage and share environmental data.
Aqua Data is accessed via a link on the Shoalhaven City Council web site directing users to the Aqua Data home page
[Editor]Click through for the rest of the press release and a link to go check out the Aqua Data interface! [/Editor]
WSDOT reported that Bertha has slowly began moving again. It must tunnel through 20 feet of unreinforced concrete with its broken seal to break through into the rescue shaft. Once that happens, the repairs to her cutterhead can commence. The Seattle Tunnel Partners predict Bertha will overheat, as she did before stopping for repairs. If that occurs, they will stop tunneling to wait for the machine to cool before continuing. STP crews also chipped away at a Bertha-sized cut-out in the access shaft to make for a cleaner breakthrough. See video below. [Source: WSDOT and WSDOT YouTube Channel. Image: YouTube]
National Driller magazine recently republished a paper by authors from GRL Engineers Inc. and Pile Dynamics Inc. (PDI) describing a demonstration project for the Texas Department of Transportation involving thermal integrity profiling (TIP) of soil nails. TIP involves using the thermal energy created by curing concrete to determine the shape of a grout or concrete body and the position of reinforcement within a grouted or concreted hole. It has been used successfully for QC of drilled shafts and auger cast piles. It can be performed in open access ports by lowering a thermal probe down the hole, or by attaching thermal wire cables to the reinforcement with sensors spaced every 6 inches. This study used the thermal wire cables attached to two soil nail bars grouted into 6 inch diameter holes. The first nail had no deliberate defects, the second had two intentional soil inclusions attached to the bar prior to grouting. The TIP successfully identified the anomalies and it appears that the method shows potential for QC of the shape and diameter of a grout body around a soil nail. [Source: Read the article at National Driller. Image: National Driller]
The Alaskan Way Viaduct tunneling project was in the news late last year when settlement of the Viaduct was reported during the dewatering efforts for the Bertha TBM rescue shaft. A recent post by WSDOT makes it clear that the settlement of the viaduct has been a problem for many years before the start of construction. The most recent round of monitoring by WSDOT began in 2001 after the completion of repairs to the the Viaduct following the Nisqually Earthquake. By 2006, a total of 4 3/4 inches of settlement had been recorded at one location. It appears that the rate of settlement is on the order of about 1/8 inch to 1/4 inch per year. I am sure the dewatering around the access pit didn't help the problem, but it looks like it didn't create it by itself either. This information just underscores the importance of the tunnel project to replace this aging structure. [Source: WSDOT Alaskan Way Viaduct. Image: WSDOT and STP via KPLU]
Redditch 30th Jan 2015 - The new release of HoleBASE SI includes ‘scheduling tools’ that allow engineers to electronically schedule geotechnical or environmental testing. This major breakthrough is likely to transform the way consultants and laboratories communicate with each other over the coming months.
The new improvements also provide a glimpse of how well integrated customers and laboratories can be with the first UK wide implementation of a web service connection to ALcontrol’s @mis online laboratory data management system. . This unique development allows customers to schedule testing directly into the @mis system using data and tools inside of HoleBASE SI and then be notified within HoleBASE SI when the testing is completed.
[Editor] Click through for the rest of the press release from GeoPrac Sponsor, Keynetix [/Editor]
Hawthorne, NJ (February 11, 2015): Gerald Verbeek, of Verbeek Management Services (VMS), has accepted the position of chair of DFI’s Testing and Evaluation Committee. Verbeek succeeds outgoing chair, Don Robertson of Applied Foundation Testing, who led the committee since 2013.
In 2004, after 20 years in the oil and gas industry, Verbeek started VMS, a management consulting business. One of the firm’s activities is helping European companies with their business in North America. Another area of concentration is providing detailed recommendations regarding geotechnical equipment and practices, especially in the area of foundation testing and (seismic) cone penetration testing (SCPT).
[Editor] Click through for the rest of this DFI press release. [/Editor]
The excavation has been completed for the access shaft or rescue shaft that was needed to be able to remove the damaged cutterhead of the Bertha TBM on the Alaskan Way Viaduct Replacement project in Seattle. The target depth of 120 feet was reached on January 30. WSDOT reports that settlement levels have remained stable in the pit area after an earlier settlement issue. In addition to the project update on the WSDOT project page, there is an excellent article on the work done by Malcom Drilling to construct the shafts used to form the excavation walls in the January issue of Foundation Drilling Magazine. I highly recommend that article. You can also see some neat raw video from WSDOT below.
MOUNTAIRY, NC—NCFI Polyurethanes officially launched its new online informative and educational content presence today: www.NCFI.com. The new website replaces the former corporate site, and eight former brand-specific sites.
“We found we need to roll everything up under the NCFI umbrella,” says Chip Holton, President of NCFI. “We turned fifty last year, and our name is well-known and trusted for experience producing the highest quality American engineered and manufactured products. We wanted our web presence to reflect that, and help our customers around the world get what they need quickly and with ease.”
[Editor]Click through for the rest of the press release from GeoPrac.net sponsor, NCFI Polyurethanes [/Editor]