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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Extraction of Layer Properties from Intelligent Compaction Data
The TRB/NCHRP has a new publication out: TRB’s National Cooperative Highway Research Program (NCHRP) Innovations Deserving Exploratory Analysis (IDEA) Final Report for NCHRP-IDEA Project 145: Extraction of Layer Properties from Intelligent Compaction Data examines a […]
Deleware Forced to Redesign Unfinished Bridge Because of Consolidation Issues
[Update 2/10/08] Updated the name of the bridge. [/Update]
DelDOT is putting the new Indian River Bridge over out to bid. The current bridge is said to be in danger of failing between 2008 and 2012 according to the Army Corps of Engineers, seems to be related to scour. From what I hear, the tidal currents at that inlet being spanned over are tremendous, with water velocities on the order of 35 mph.
In 2005, Mactec, a geotechnical firm, provided a geotechnical report and associated recommendations to DelDOT for how to construct the 45-ft high approach embankments for a 1,400-ft long bridge in light of a 60-ft clay layer (sounds like pre-loading). However, the embankments are not settling as Mactec predicted (not sure if its more or less, probably less meaning slower) and are "shifting laterally" (squeezing?) so the DOT is going with a longer bridge to span the problem soil. More after the break.
Review of GeotechTools.org – Geo-Construction Information and Technology Selection Guidance
I first heard about Geotech Tools through a TRB Strategic Highway Research Program (SHRP 2) publication titled Geotechnical Solutions for Soil Improvement, Rapid Embankment Construction, and Stabilization of the Pavement Working Platform. The final version of the report was released in February of this year. The report is one of the project deliverables for the SHRP 2 Project R02.
The primary deliverable of the project and the subject of this review is Geotechtools.org, a web-based tool for geotechnical engineers, structural engineers and pavement engineers. This website is a “toolkit of geotechnical information to address all phases of decision making from planning to design to construction.” What does that mean exactly? Great question. In this article I will give you an overview of the site and its resources and how it might help you on your next project.