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]
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]
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]
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 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]
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]
Geotechnical 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.
TRBâ€™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]
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]
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.
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]
TRBâ€™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]