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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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New FHWA Soil Nail Manual Addresses LRFD, Hollow Bars PDF Print E-mail
Written by Randy Post   
Sunday, 12 April 2015 22:05

GEC7_2015_coverSince March of 2003, the FHWA’s Geotechnical Engineering Circular Number 7 (GEC No. 7) has been the standard reference document for design and construction of soil nail retaining walls in roadway applications, and really in all applications. The FHWA has released an updated version of this manual as of February of 2015.  This new version is still called GEC No. 7, but now titled “Soil Nail Walls Reference Manual.”  You can download the document from the FHWA’s Geotechnical Engineering website.

I am still in the process of working through the manual, but one of the major changes is the addition of the implementation of the Load and Resistance Factor Design (LRFD) platform. This will have an implication on all future soil nail walls for roadway projects.

The manual also appears to have removed example problems solved using SNAILZ software (by CalTrans) in favor of the FHWA’s own Soil Nail Analysis Program (SNAP) 2 software. I guess we’re going to have to get familiar with that software as well.  I’m strongly considering looking into SNAIL Plus by DeepExcav, a commercial product.  I’ve seen demos before, and have been very impressed.

Finally, I was very curious to see what they would say about hollow bar soil nails.  They review some of the work done in the last 5 years or so done by the FHWA and ADSC.  If I understood correctly, it appears that they are saying that because of the uncertainties regarding damage to corrosion protection during installation, they are still not recommending hollow bar nails for roadway applications, except if the ground conditions are non-aggressive and if you use sacrificial steel.  I suppose that at least opens the door to this technology for collapsing ground situations.  

Last Updated on Tuesday, 14 April 2015 05:54
 
How to Use Thermal Integrity Profiling to Assess Soil Nail Integrity PDF Print E-mail
Written by Randy Post   
Wednesday, 18 February 2015 22:43
Using thermal integrity profiling on soil nails

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]

 
Video: AutoCAD Geology Solids and Civil 3D PDF Print E-mail
Written by Randy Post   
Wednesday, 28 January 2015 23:20

GeoPrac sponsor Keynetix has released a video tutorial on how to create geology solids in AutoCAD using Civil 3D. This is a new and improved technique using the Civil 3D productivity pack 1. [Source: Keynetix YouTube Channel. Image: YouTube]

Last Updated on Thursday, 29 January 2015 06:27
 
Free CPT Webinar on February 2 from ISSMGE PDF Print E-mail
Written by Randy Post   
Monday, 26 January 2015 23:21
Prof. Peter Robertson to give Free CPT Webinar on February 2, 2015 through ISSMGE

The International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) is launching its first Webinar of the year on February 2. This upcoming webinar on Cone Penetration Testing will be given by CGS Member Prof. Peter Robertson (from Gregg Drilling - California USA). All ISSMGE webinars are offered free of charge in an effort to assist geotechnical engineers worldwide and to promote our profession. You are welcome to attend and highly encouraged to invite all geotechnical & civil engineers and students to participate. This Webinar will be launched on February 2 at 12 noon GMT (4:00 am PST and 7:00 am EST in Canada). lt will then be followed by a 2-day Q&A session that, like the webinar video, can also be viewed anytime later on the ISSMGE Website. Find more details about the webinar at the ISSMGE website. [Source: The Canadian Geotechnical Society. Image: ISSMGE]

 
2015-2016 Academic Scholarships from ADSC PDF Print E-mail
Written by Randy Post   
Tuesday, 20 January 2015 15:47
ADSC - International Association of Foundation Drilling

Scholarship Applications for the 2015-2016 school year are now available on the ADSC website. Applications are due March 23, 2015. These $3,000 scholarships also include a trip to ADSC's annual conference with travel expenses paid. Applicants must be currently enrolled in an ABET or CEAB accredited engineering program or be a graduate from such a program, and must plan to enter or continue graduate school during the current academic year. [Source: Download the scholarship application form from ADSC - The International Association of Foundation Drilling. Image: ADSC]

 
The Evolution of Sonic Drilling, from Inventor Ray Roussy PDF Print E-mail
Written by Randy Post   
Sunday, 11 January 2015 23:41

Ray Roussy, pioneer of the sonic drilling technique

Ray Roussy was a pioneer of the sonic drilling technique. In an interview with National Drilling Magazine, Roussy shares how the sonic drilling method began, what changes have occurred over time, and what some of the future challenges are for the method and how they will be faced by the drilling industry. [Source: National Driller Magazine . Image: National Driller]

Last Updated on Monday, 12 January 2015 06:43
 
November - December 2014 Foundation Drilling Magazine PDF Print E-mail
Written by Randy Post   
Sunday, 28 December 2014 23:15
ADSC Foundation Drilling Magazine - November/December 2014

The November/December issue of ADSC's excellent magazine is available online. Features in this issue include:

  • Texas Shafts Installs Deep, Battered Drilled Shafts for Dallas Bridges
  • Post Grouted Drilled Shaft Research Part II
  • ADSC's 2014 DROS Another Success
  • 2014 in Review
  • Focus on IFCEE 2015
[Source: Read the magazine online courtesy of ADSC. Image: ADSC]

 
2014 Seed Lecture - Developments in the Assessment of Liquefaction Potential and Its Consequences PDF Print E-mail
Written by Randy Post   
Sunday, 28 December 2014 23:07

2014 Seed Lecture: Developments in the Assessment of Liquefaction Potential and its Consequences, presented by W.D. Liam Finn, Ph.D.,P.Eng., Life.M.ASCE, Professor Emeritus, University of British Columbia at the 2014 Geo-Congress in Atlanta, GA, USA.

[Source: Geo-Institute YouTube Channel. Image: YouTube]

Last Updated on Monday, 29 December 2014 06:12
 
FHWA Geotechnical Team and NHI To Offer Virtual World Training PDF Print E-mail
Written by Randy Post   
Friday, 21 November 2014 08:15

FHWA Geotechnical Team and NHI will offer training in a virtual worldEconomic times have been hard for federal, state and local transportation agencies as well as industry representatives since the recession started.  Getting approval to travel for conferences or training classes has been difficult if not impossible.  The Geotechnical Team at the FHWA and the National Highway Institute (NHI) has come up with a solution to that problem by offering training in an online virtual environment. In the near term they will be offering a tour of the virtual training venue and technology showcase and plan to have more demos in the coming months.  They will offer the first training at the March 2015 International Foundation Congress and Equipment Expo (IFCEE) in San Antonio, Texas.

[Source: Check out more info in the NHI and FHWA Informational PDF via ADSC]

Last Updated on Friday, 21 November 2014 08:17
 
Video: Secant or Tangent Piles PDF Print E-mail
Written by Randy Post   
Friday, 21 November 2014 00:42

I like Hayward Baker's series of videos using animations to demonstrate different geotechnical construction methods. This video demonstrates how tangent pile shafts or secant pile shafts are constructed. Check out the video. Note: Hayward Baker is a sponsor of this website.

[Source: Hayward Baker YouTube Channel. Image: YouTube]

Last Updated on Friday, 21 November 2014 08:01
 
Shotcrete Made From Tailings Could Insulate Underground Mines PDF Print E-mail
Written by Randy Post   
Sunday, 26 October 2014 23:30
Underground mine ventilation plan

Underground metal mines can have extremely high temperatures, making it hazardous for employees to work there for more than a few minutes at a time. Researchers from my alma mater, the University of Arizona, are studying the possibility of using a common mining waste product, tailings, as aggregate in shotcrete with good insulation properties that will be used to coat rock surfaces that readily conduct heat. [Source: Arizona Engineer. Image: Arizona Engineer]

 
DIGGSML.org website revamped PDF Print E-mail
Written by Randy Post   
Sunday, 26 October 2014 23:16
DIGGSML Standard Data Framework Model

DIGGSML is an XML-based schema designed for transfer of geotechnical and geoenvironmental data between different organizations. In 2013, the ASCE Geo-Institute was awarded a 2-year contract by the Ohio DOT to implement DIGGS. The current version, 2.0a, is undergoing pilot testing through early 2016. [Source: Find out more about this data framework at DIGGSML.org via LinkedIn Geotechnical Data Hub. Image: DIGGSML]

 
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