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AEG OR Chapter February 18, 2020 Meeting
Old Market Pub
Portland, OR
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Feb 18, 2020 6:00 PM

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Pay at the Door Free Sales Ended
General fee = $25, Public Agencies = $20, Students = free.
Student Fee Free Sales Ended
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Public Agencies $20.00 Sales Ended
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General Fee $25.00 Sales Ended
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AEG OR Chapter February 18, 2020 Meeting
Advances in Rockfall Protection: A Preliminary Design Tool for Attenuators

PURCHASE OF TICKETS USING BROWN PAPER TICKETS: Ticket sales stops by Noon on Monday February 17th.

(At the door payments in Cash or Checks only.)

6:00  Social Hour
6:45  Dinner (Salad and Pizza*)
7:30  Presentation

*Please contact the Board if you have any specific dietary restrictions.


Speaker: Tim Shevlin, P.G.


Attenuators are a passive rockfall protection solution sometimes described as a flexible rockfall barrier with a prolonged draped tail. To date there is no formal solutions to their design. In comparison to classical flexible rockfall barriers where only translational kinetic energy is considered and the rockfall is stopped completely; attenuators present a design challenge wherein both the rotational and translational component of rockfall must be considered. In addition, Attenuator Systems are not stopping the rockfall, rather changing the trajectory and moderating the velocity. In order to develop a dimensioning concept that addresses these dynamics, it is important to fully understand the attenuation process. A joint research program between Wyllie & Norrish Rock Engineers, Ltd. in Canada, Geobrugg North America, LLC, and Geobrugg AG, Switzerland investigated this process. The loading of the system, the attenuation processes and the importance of the rotational component have been analyzed in full-scale testing over a three-year period, on a site in British Columbia. This contribution provides insights into the analysis of the loading mechanisms acting on the attenuator system during rockfall impact. Rock motion dynamics are compared between those extracted from the accelerometer and gyroscope sensors embedded in the test blocks, high speed video analysis and rockfall simulations. These analyses provide the foundations with which a dimensioning tool has been created.

SPEAKER BIO: Tim Shevlin, P.G.

Tim Shevlin is an Engineering Geologist with over 15 years of experience performing geotechnical and geologic investigations. Mr. Shevlin has a Bachelor of Science in Environmental Science from Allegheny College and a Master of Science in Geology from Kent State University. He is also a licensed Professional Geologist in the State of Pennsylvania and Oregon.

Prior to joining the Geobrugg team Tim worked on both public and private sector projects for nationally-known engineering consulting firms performing geotechnical investigations and designs. He has experience working on commercial development projects, water resource projects, and transportation/railroad projects.

Tim is Geobruggs Regional Manager for Northwest USA & Hawaii and the Technical Director of Sales and Marketing; he works out of the Salem, Oregon.

Geobrugg North America, LLC: Protecting people and infrastructure from Natural Hazards scale consulting firms. He received his B.S. and M.S. degrees in Civil & Environmental Engineering from Portland State University.


Old Market Pub (View)
6959 SW Multnomah Blvd.
Portland, OR 97223
United States



Kid Friendly: Yes!
Dog Friendly: No
Non-Smoking: Yes!
Wheelchair Accessible: Yes!


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