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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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Paper on Underwater Noise Reduction of Marine Pile Driving PDF Print E-mail
Written by Randy Post   
Thursday, 05 January 2017 17:19
Marine pile driving

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]

 
Géotechnique Rankine-lecture papers PDF Print E-mail
Written by Randy Post   
Thursday, 05 January 2017 17:18
Suzanne Lacasse, NGI, the 2015 Rankine Lecturer

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]

 
Gèotechnique Top 5 Papers of 2016 PDF Print E-mail
Written by Randy Post   
Monday, 19 December 2016 21:28
Gèotechnique geotechnical journal

As part of their Best of Research and Practice initiative, Gèotechnique has made their top five papers FREE to download until 22nd December.

  • A constitutive modelling framework predicting critical state in sand undergoing crushing and dilation
  • Evaluation of the viscosity of tropical soils for debris flow analysis: a new approach
  • Time-lapse monitoring of internal erosion in earthen dams and levees using ambient seismic noise
  • Shear band propagation analysis of submarine slope stability
  • Finite-element analysis of a deep excavation case history
[Source: Download the papers from Gèotechnique via Geotechnical Engineering News LinkedIn Group. Image: Gèotechnique]

 
RockWare Launches New Customer Portal PDF Print E-mail
Written by Randy Post   
Thursday, 01 December 2016 15:53
Rockware launches new customer portal

RockWare recently launched a new Customer Portal. It's designed for registered users of RockWorks, LogPlot, RockWare GIS Link, and AqQA software licenses, where you can:

  • view all of the licenses in your organization
  • see upgrade options
  • purchase upgrades
  • view maintenance status
  • renew maintenance
  • access software download links
  • and more to come!
[Source: Check out the new portal from RockWare. Image: Rockware]

 
FHWA Releases GEC 12 - Design and Construction of Driven Pile Foundations PDF Print E-mail
Written by Randy Post   
Monday, 21 November 2016 06:06
Pile driving on the west side approach of the W. R. Bennett bridge in Kelowna, British Columbia, Canada, June 2006

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.'

This update reflects the state of the practice for the design, construction and inspection of driven pile foundations for transportation structures. The guidance is developed following the AASHTO LRFD Bridge Design Specifications, 7th Edition, 2014 with 2015 Interim, and Construction Specifications, 3rd Edition, 2010, with '11, '12, '13, '14, and '15 Interims. The text is developed with a sufficiently broad scope to be of value to a wide range of transportation specialists responsible for assisting with selection, design, development of specifications, construction monitoring, and contracting methods for driven piles. [Source: Download the Publications from the Federal Highway Administration. Image: Stéphane Charette, Dual-licensed under the GFDL and CC-By-SA-2.5, 2.0, and 1.0]

 
Free CPT Webinar on December 2, 2016 at 12:00 PM PST PDF Print E-mail
Written by Randy Post   
Monday, 21 November 2016 05:54

Gregg DrillingGregg Drilling is pleased to announce our next free CPT webinar! Please register for CPT worked examples using CLiq version 2 on Dec 2, 2016 12:00 PM PST at:

https://attendee.gotowebinar.com/register/4106279384711778818

This webinar provides worked examples of CPT-based liquefaction analyses using the software CLiq v2. CLiq v2 has several new features that will be demonstrated during this webinar.

Dr. Peter K. Robertson, Technical Adviser at Gregg Drilling and Professor Emeritus at the University of Alberta, will be the presenter. The webinar will last approximately 1 hour. After the presentation, Dr. Robertson will answer any questions from participants for approximately 20 mins.

All attendees to the live webinar will receive an e-mail 24-hrs after attending to certify their attendance and provide proof of 1 PDH. After registering, you will receive a confirmation email containing information about joining the webinar.

 
7.8 Magnitude Earthquake in New Zealand PDF Print E-mail
Written by Randy Post   
Wednesday, 16 November 2016 14:57
New Zealand road damaged by fault rupture

Significant destruction has occurred in New Zealand as a result of a 7.8 magnitude earthquake near the town of Kaikoura, about 2 hours drive north of Christchurch. Video footage shows significant surface rupture causing damage to homes and infrastructure. There have been numerous landslides as well. The town of Kaikoura had to be evacuated, including about 1,000 tourists, after it was left without power by the event. Only two casualties have been reported based on the information I have heard, and it's fortunate there was not more loss of life. [Source: CNN.com. Image: Mirror.co.uk]

 
SOLDATA becomes SIXENSE PDF Print E-mail
Written by Randy Post   
Wednesday, 16 November 2016 14:56
Sixense services a wide variety of market sectors

Geotechnical and structural monitoring company Soldata has changed names to SIXENSE. SIXENSE is a group of world-class companies offering excellence in digital services and solutions specializing in infrastructure, soil and the environment in order to understand, analyze, anticipate and optimize their clients' investments. SIXENSE brings together 10 companies some having over 20 years of experience in engineering and monitoring technologies. Their mission is to provide support to designers, builders, operators and infrastructure owners in order to successfully overcome three challenges facing them: Construction project management, Asset management, and Risk management. SIXENSE group operates in 20 countries and has strong support from its 600 employees. [Source: Sixense. Image: Sixense]

 
GDCTV Episode 1 - John Yen Interview at Regional Connector PDF Print E-mail
Written by Randy Post   
Thursday, 13 October 2016 22:28

Group Delta Consultants is a California geotechnical engineering firm that has quite a resume of mega projects under their belt, from dams to bridges to subway stations and lines. Their CEO, Mike Reader (a University of Arizona alumnus from my old department, Mining and Geological Engineering, go Cats!) is hosting a series of videos highlighting some of their projects. They call it GDCTV. Their first episode on the Metro Regional Transit Connector Corridor Project in Downtown Los Angeles is embedded below. You can find out more about their projects on their website too. [Source: Group Delta YouTube Channel. Image: YouTube]

 
Video: DeWind One-Pass Trenching Soil Bentonite Wall Animation PDF Print E-mail
Written by Randy Post   
Thursday, 13 October 2016 22:26

DeWind One-Pass Trenchers can install Mixed in Place Soil Bentonite, or Soil Cement Bentonite Walls up to 125' deep. Their powerful trenchers can homogenize all of the native soils with various additives. The mixing paddles rotate at 14 feet per second hyper-mixing everything in the column from top to bottom in a continuous evenly mixed wall. [Source: YouTube. Image: YouTube]

 
Timelapse of Maccaferri 5000kJ rockfall protection barrier PDF Print E-mail
Written by Randy Post   
Thursday, 22 September 2016 23:41

This kind of thing is like geo-porn for some of us! You might want to turn down or mute your speakers though, the background music is a little jarring at first. [Source: Maccaferri YouTube Channel. Image: YouTube]

 
New Website for Geoprofessional Business Association PDF Print E-mail
Written by Randy Post   
Thursday, 22 September 2016 23:38
New GBA Website

Joel Carson, the Executive Director of the Geoprofessional Business Association (GBA), recently announced the association's new website. It's a great tool to deliver the excellent resources and information that the GBA makes available to member firms and the industry in general. Did you know that membership is at a firm-level? If your firm is a member, you are a member. You just need to register for an account on the website using your company email address, and you will have access to all of the great resources the GBA has put together. [Source: Visit the GBA's new website. Image: Fusionspan]

 
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