The geotechnical research program conducts applied research to solve transportation-related problems with the aim of saving time and money, and delivering a better product. Many projects are conducted in-house in our state-of-the-art laboratories; the Federal Highway Administration (FHWA) also supports external research projects through funding, participation on National Cooperative Highway Research Program (NCHRP) and Transportation Pooled Fund studies, and evaluation of results.
The main FHWA Geotechnical focus areas are: (1) Extreme Events, Geohazards, and Sustainable Geotechnics; (2) Reliability Based Design and Construction; (3) Advanced Geotechnical Modeling; (4) Design and Construction Optimization; (5) Site Characterization; and (6) Quality Assurance.
Projects are determined based on the research needs of the transportation industry and the potential for national impact. The FHWA geotechnical research program identifies these needs through cooperation with FHWA field offices, Department of Transportation headquarters, Federal Lands Highway Division, and the Resource Center. Feedback is also gained from industry, academia, and contractors.
Figure 1. Unconfined Geosynthetic Reinforced Soil Performance Test at Failure.
Research is currently being performed in the following areas:
(1) Engineered fills.
(2) Laboratory testing of aggregates.
(3) Geotechnical aspects of pavements.
(4) Load and Resistance Factor Design (LRFD) for geotechnology.
(5) Retaining walls.
(6) Bridge/Approach transitions.
(7) Large diameter open end piles (LDOEPs).
(8) Long-term performance and management of geotechnical assets.
(9) Shallow foundations.
(10) Post-grouted drilled shafts.
(11) Remote automated data collection systems.
Click here to download the latest FHWA Deep Foundation Load Test Database (DFLTD v.2), developed in 2016.
Figure 2. Sunday Creek GRS Bridge in King County, WA.
A key success of the research program is the development and implementation of the Geosynthetic Reinforced Soil Integrated Bridge System (GRS-IBS). The proven performance of those bridges led to the selection of GRS-IBS technology for the FHWA’s first, second, and third rounds or the Every Day Counts (EDC) initiative. Since 2010, over 300 bridges have been designed and constructed as a result of the Agency’s efforts. More information on the technology can be found on the EDC Web site.