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.
Shannon & Wilson, an employee-owned consulting firm headquartered in Seattle, Washington and with 12 offices across North America, recently announced a series of promotions for 2017. The promotions, announced Jan. 10, are Christopher Darrah to vice president; Jeri-Beth Bowman to senior associate; Jeremy Butkovich, Andy Caneday, Kathy Corbett, Matt Gibson, Kathryn Petek and Tyler Stephens to associate. [Source: View more info at TrenchlessOnline.com. Image: Trenchlessonline.com]
The ADSC/IAFD has produced a safety video on Micropile & Anchored Earth Retention. It's sure to be a great training video for contractors, but it is also a great resource for engineers and inspectors who will be working around the operations. [Source: ADSC IAFD YouTube Channel. Image: YouTube]
The Geoprofessional Business Association (GBA) has announced a new course offering for its members, Geoprofessional Operational Leadership Development (GOLD) Course. This course is targeted at new and emerging leaders, group leaders, office managers, regional managers, and business unit leaders in the AE industry. It will contain specific instruction on operational aspects of the typical Geoprofessional business. The GBA has partnered with the McMahon|Siegel Group for the course, one of the instructors is former Kleinfelder CEO, Bill Siegel (see Bill's article on GeoPrac). [Source: Read more about the GOLD course from the GBA. Image: ffaalumni on Flickr (CC BY-ND 2.0)]
Impact pile driving of steel piles in aquatic environments produces extremely high underwater sound levels. To address this problem, a double-walled pile has been developed to decrease the total noise transmitted into the water and substrate. The double-walled pile consists of two concentric steel pipe piles flexibly connected by a special driving shoe, allowing for an air gap between the two tubes. The double-walled pile is driven into the sediment by using traditional equipment that strikes the inner pile only. The air gap between the inner and outer pile and the flexible coupling prevent the radial deformation wave produced by the pile hammer from interacting with the water and the sediment. A second full-scale test of the double-walled pile technology was performed at Vashon Island, Puget Sound, Washington. A potential reduction of the peak pressure in excess of 17dB was observed for the double pile and of 16 dB for the mandrel pile. Root mean square (RMS) levels and cumulative sound exposure levels (SEL) decreased by 13 dB and 12 dB, respectively. Use of the WSDOT Geotechnical Design Manual Pile Driving Formula showed that the pile capacity of the novel piles was comparable to that of a control pile with the same outer diameter. PDA (Pile Driving Analyzer) data were also collected from both the inner and outer piles of the mandrel and double piles and will be used to modify current software for predicting drivability and stresses in the piles (WEAP (Wave Analysis of Pile Driving) analysis) and for estimating load capacity after driving (CAPWAP (Case Pile Wave Analysis Program) analysis). [Source: Read more and download the publication from WSDOT. Image: Flexiboat.com]
The Rankine lecture is one of the most prestigious invited lectures in all of geotechnical engineering. The Institute of Civil Engineers has a list of all of the Rankine lecturers and links to most of their lecture papers which are published in Géotechnique. As far as I can tell, you still need to have access to Géotechnique's journals to view them, but at least this is a nice central list of all of the papers and past lecturers. [Source: List of Rankine Lecturers at the ICE Virtual Library]
According to the site Geotechpedia, this tunnel failure occurred on November 29, 2016 around 9am (local time?). The tunnel is located in Yusufeli district of Erzurum in northeastern Turkey. It is somehow related to the Yusufeli dam. There were no reports of fatalities. [Source: YouTube via Geotechpedia. Image: YouTube]
Arizona DOT is undertaking a project to remove hazardous rock formations above Highway 77 between the towns of Globe and Winkelman, AZ (east of Phoenix). On November 29/30, The blasting work inadvertently dislodged an 18 foot boulder from about 150 feet above the roadway. The highway was closed at the time for the blasting operation, but it did take crews longer than planned to clear the road as a result of having to break up the massive boulder. [Source: Read more in the ADOT Press Release. Image: ADOT]
Terracon is expanding into the Virgina market through the acquisition of Geotechnical Consulting & Testing Inc. (GC&T), headquartered in Woodbridge, with a laboratory in Dulles. This is Terracon's 4th acquisition of 2016.
Formed in 1990, GC&T is a privately owned firm primarily dedicated to providing geotechnical and materials testing services. GC&T provides services for transportation and infrastructure, commercial, industrial, retail, residential, office, medical, and hospitality projects throughout the Northern Virginia, Maryland, and Washington, D.C., metropolitan area.
The FHWA recently released 'GEC 12 - Design and Construction of Driven Pile Foundations' (FHWA-NHI-16-009 and FHWA-NHI-16-010). A companion publication 'Design and Construction of Driven Pile Foundations - Comprehensive Design Examples' (FHWA-NHI-16-064) is also available. This publication replaces the previous Reference Manual titled Design and Construction of Driven Pile Foundations, published in April 2006. The publications become the twelfth in the series of geotechnical engineering guidelines called 'Geotechnical Engineering Circulars.'