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Sample Guide Specifications for Construction of Geosynthetic Reinforced Soil-Integrated Bridge System (GRS-IBS) PDF Print E-mail
Written by Randy Post   
Tuesday, 20 November 2012 22:48
GRS-IBS Guide Specifications

This guide was issued to provide guidelines for construction of the geosynthetic reinforced soilintegrated bridge system (GRS-IBS). Refer to Geosynthetic Reinforced Soil Integrated Bridge System Interim Implementation Guide for GRS-IBS design and construction guidelines. This guide serves as the technical basis for agency-developed standard specifications. Local experience and practice should be incorporated as applicable. [Source: FHWA. Image: FHWA]

 
Geotechnical Activity Index PDF Print E-mail
Written by Randy Post   
Wednesday, 14 November 2012 15:33

Deep Excavation's Geotechnical Activity Index chart as of October 2012

Deep Excavation, the makers of shoring design software, DeepXcav, are reporting on the Geotechnical Activity Index, that they describe as:

The geotechnical activity index is a new index that reports on the geotechnical potential in each State within the US. The index takes into consideration the geotechnical activity and population in each state. The main objective is to track changes over time in geotechnical and foundation works.

This is some really interesting data to look at. I'm curious what the source of the info is. Maybe we can get Deep Excavation Founder and CEO Dimitrios Konstantakos to give us a little hint! [Source: Deep Excavation. Image: Deep Excavation, LLC]

Last Updated on Wednesday, 14 November 2012 22:37
 
APE develops Helical Pile systems PDF Print E-mail
Written by Randy Post   
Thursday, 08 November 2012 23:21
APE large diameter helical piles, a relatively new deep foundation alternative

Well-known pile hammer manufacturer APE has purchased technology for driving and coupling large diameter helical piles that could help make this technology more mainstream. Rather than pounding the pile into the ground, the steel drill pipe casing is rotated using patented couplers in a way that reminds me of a giant socket wrench or an Allen wrench. The base of the pile can be post-grouted, or grouted during installation. APE notes that this technology is ideal for environmentally sensitive areas where pile driving is not an option. Piles up to 42 inches in diameter have been successfully installed and load tested. [Source: APE News. Image: APE]

 
Two November Webinars from Maccaferri: Advancing Geosynthetics and Hydraulic Applications PDF Print E-mail
Written by Randy Post   
Monday, 05 November 2012 15:21
I've never seen gabions and reno mattresses used like this...pretty amazing.

Maccaferri, a manufacturer of geogrid, gabion, rockfall protection, and other geoconstruction products is offering a series of webinars. On November 8, the topic will be 'Advancing Maccaferri Geosynthetics'. On November 15, the topic will be 'Gabions and Reno Mattresses in Hydraulic Applications'. Geosynthetica has more info on the webinars at the link below. [Source: geosynthetica.net. Image: Maccaferri via geosynthetica.net]

 
Gregg Drilling offers Cone Penetration Testing (CPT) Webinars PDF Print E-mail
Written by Randy Post   
Friday, 26 October 2012 00:15
Gregg Drilling CPT track rig

Gregg Drilling has started a series of educational webinars on cone penetration testing or CPT. The first webinar, "Introduction to CPT" was offered in September is now available in video form. The next session entitled "CPT Interpretation and Soil Parameters" will be held on December 14. Visit GreggDrilling.com for more information and to sign up. [Source: Gregg Drilling via Geoengineer.org. Image: GreggDrilling.com]

 
TenCate receives patent for Geoport geotextile tube filling system PDF Print E-mail
Written by Randy Post   
Tuesday, 23 October 2012 23:23
TenCate Geoport geotextile tube-filling system

Geotextile tubes are filled by pumping material in slurry form into the tube to form structures that can be used as breakwaters, levees, or other containment structures. TenCate has a new product that much improves what was a weak point in the system, the connection between the geotextile tube and the injection system. Their newly-patented Geoport mechanical injection system reduces stress at the injection point, and makes sure that the final closed connection is as strong as the geotextile itself. [Source: Geosynthetics. Image: Geosynthetics]

 
ASTM Updates for September 2012 PDF Print E-mail
Written by Randy Post   
Tuesday, 09 October 2012 22:15

American Society of Testing Materials Logo - ASTMGeotechnical engineers, geotechnical lab managers, CQA service managers and others utilize ASTM standards on a daily basis.  Here at GeoPrac.net, we monitor the periodic updates from ASTM and summarize changes to relevant standards that may be of interest to geoprofessionals.  Click through for a list of revised and reapproved standards from September of 2012.

 
Assessing the Long-Term Performance of Mechanically Stabilized Earth Walls PDF Print E-mail
Written by Randy Post   
Sunday, 30 September 2012 23:10
Assessing the Long-Term Performance of Mechanically Stabilized Earth Walls

TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 437: Assessing the Long-Term Performance of Mechanically Stabilized Earth Walls explores methods to assess the long-term performance of mechanically stabilized earth walls. For the purposes of the report, "long-term" denotes the period of time from approximately one year after the wall is in service until the end of its design life.

The report focuses on state and federal agency wall inventories and highlights methods of inspection and assessment of wall conditions.

Mechanically stabilized earth walls are retaining walls that rely on internal reinforcement embedded in the backfill for stability. [Source: TRB. Image: TRB]

 
Geosynthetic Institute issues new white paper on MSE landfill berms PDF Print E-mail
Written by Randy Post   
Thursday, 27 September 2012 15:19
MSE Retaining Wall berm for a landfill

The Geosynthetic Institute has released a white paper examining 'U.S. State Environmental Agency Status with Respect To Reviewing and Permitting Mechanically Stabilized Earth (MSE) Landfill Berms'. The use of MSE Walls to buttress landfill berms has been increasing in popularity. The walls can potentially decrease the need for ROW and increase the ultimate volume of waste that can be stored. This short white paper by Robert Koerner and Jamie Koerner presents the results of a survey to various state agencies that permit landfills. The Geosynthetic Institute appears to be considering producing some form of guidelines for the use of MSE Berms. [Source: Geosynthetics. Image: Geosynthetic Institute]

 
Podcast on Geotechnical Consultant Agreement - ConsensusDocs 246 PDF Print E-mail
Written by Randy Post   
Sunday, 26 August 2012 23:00

Consensus Docs is a construction contract website and service. They have posted a podcast on one of their documents, a Geotechnical Consultant Agreement. The podcast is embedded below. You can find a PDF transcript and more information at their website.

[Source: ConsensusDocs]

Last Updated on Saturday, 25 August 2012 10:40
 
Online Geological Map of Arizona PDF Print E-mail
Written by Randy Post   
Monday, 13 August 2012 01:39

Arizona Geology Map

The Arizona Geologic Survey has released an online version of the geologic map of Arizona. It uses a Google Maps interface, and allows you to zoom in on any area in the state to view the geologic units overlaid on a Google base map or satellite image. You can adjust the level of transparency of the map and view the unit descriptions as well. They have set the bar high for other geologic surveys! [Source: Arizona Geologic Survey via Geology.com. Image: Geology.com]

Last Updated on Monday, 13 August 2012 08:42
 
Scour at Bridge Foundations on Rock PDF Print E-mail
Written by Randy Post   
Monday, 23 July 2012 05:27
Scour at Bridge Foundations on Rock

TRB’s National Cooperative Highway Research Program (NCHRP) Report 717: Scour at Bridge Foundations on Rock presents a methodology for estimating the time rate of scour and the design scour depth for a bridge founded on rock. The report also includes design and construction guidelines for application of the methodology. [Source: TRB. Image: TRB]

 
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