The Ohio DOT Division of Engineering, Office of Geotechnical Engineering, has a new procedure for pre-approval of prefabricated retaining wall systems (PWRS). In an announcement from back in April, they indicate that all wall system vendors will need to provide a detailed submittal for review and approval by ODOT. Those systems that are successful at getting on the approved products list will have to re-apply every 5 years. And all of the existing systems on the list that were approved prior to April will need to re-submit for approval since their status on the list will expire at the end of 2016. [Source: Ohio DOT OGE. Image: Redi-Rock International]
The residential high-rise Millennium Tower in San Francisco has settled a total of 16 inches since opening, 2 inches deferentially. A spokesman for the tower owner blames the settlement on the excavation next door for the Transbay Transit Center, a $2.4 billion dollar project being constructed 60 feet underground.
However, the Transbay Joint Powers Authority (Transbay) hired geotechnical firm Arup in 2010. Their initial report indicated that the tower had already settled 10 inches by the time excavation began for the Transit center. Arup seems to have been tasked with design, installation, and perhaps monitoring of a geotechnical monitoring program, some information on the scope is available in a 2012 presentation given by Arup available on the Transbay website.
This is a cool time-lapse video of a DeWind one-pass trencher installing 350 linear feet of 25' foot deep Groundwater Collection (HDPE slotted 4" pipe backfilled to grade with pea stone) in a single pass under the water table in a single pass. Their method and technology did not require any dewatering, shoring, or open excavations. [Source: YouTube via Read more about this interesting technology and company at DeWind's website. Image: YouTube]
Roger Chandler of Keynetix was the State of the Practice lecturer at this year's Sowers Symposium at Georgia Tech to commemorate the life of George F. Sowers. Roger's lecture was titled 'Transforming Geotechnical Data' discussed the way different countries value geotechnical data. Keynetix is a sponsor of GeoPrac.net. [Source: Read more about the evening on the Keynetix website. Image: Keynetix]
This is pretty cool! It's not every day that you have a major Hollywood motion picture that features drillers as the unlikely heroes! The movie 'The 33" stars some big names like Antonio Banderas, Lou Diamond Phillips, and James Brolin as the driller extraordinaire, Jeff Hart. If you missed this story, check out the GeoPrac article I wrote about the Drillers, Rigs, Rock and Hart of the Chile Mine Rescue. [Source: YouTube. Image: YouTube]
The Texas Railroad Commission issued preliminary findings saying that the hydraulic fracturing wastewater injection well operated by an Exxon Mobil subsidiary was not to blame for earthquakes that shook Reno, Texas in 2013 and 2014. From the Manufacturing.net article:
Commission investigators concluded that a well where Exxon Mobil subsidiary XTO Energy pumps millions of gallons of the wastewater likely didn't cause the quakes, but also said there wasn't enough evidence to demonstrate the earthquakes were naturally occurring. Parties have 15 days to respond.
GeoPrac sponsor Keynetix has announced some exciting news, a collaboration with the British Geotechnical Survey (BGS) on a research project to develop BIM models for geotechnical and geological data. Watch the video below, or read more in the Keynetix Press Release! [Source: Keynetix]