In case you missed it, on November 11, 2015, AET Senior Geotechnical Engineer Joe Bentler, PE, gave a presentation titled: “Geotechnical Challenges of the I-90 Dresbach/Interchange Project” to the Minnesota Geotechnical Society.
Highlighting the project and several geotechnical design aspects, the presentation educated attendees on the various geotechnical challenges the team faced during the project. For those who could not make the presentation here are four key takeaways:
1. Pile testing for the new Dresbach river bridge included dynamic pile testing (PDA), static load tests, and “statnamic” tests.
2. The team modeled the lateral resistance of foundation piles for the Minnesota abutment under potential soil movements and utilized that resistance in the global stability analyses for the abutment, which has a nearly 70-ft high approach embankment.
3. Extensive geotechnical instrumentation and automated data loggers were used to remotely monitor the approach embankment during construction, thereby confirming design assumptions and providing an additional level of confidence in the long-term stability of the embankment.
4. This project proved the benefits of having continual communication, cooperation, and coordination with the site contractor. This was especially evident during the installation of certain geotechnical sensors at original grade, directly below the future abutment, and at locations that survived the pile driving.
Join us at the 64th Annual University of Minnesota Geotechnical Engineering Conference on March 4, 2016, where Joe Bentler will present a case history describing the design, construction, and monitoring of the Wisconsin approach embankment in an area of soft floodplain soils providing further details into the Dresbach project’s geotechnical challenges.
More information about the project can be found here: