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May Meeting Notice


Wednesday, May 14, 2014


Design of a Rescue Shaft for Bertha


Rose Vine Hall (downstairs at Grumpy's Bar & Grill)
2801 Snelling Ave. N., Roseville, MN (Mapquest link)



6:00 pm

Social Hour sponsored by Sponsored by Brierley Associates

7:00 pm

Dinner: Salad, Rolls, Coffee/Soda and a choice of:


10-ounce Top Sirloin – Char-grilled and topped with bleu cheese garlic butter.  Served with white cheddar mashed potatoes and a sautéed vegetable medley. $35.00*


Stuffed Pork Chops – Two char-grilled pork chops stuffed with golden raisins, cornbread and apples. $35.00*


Feta Cheese and Sun-dried Tomato Stuffed Walleye – served over white cheddar mashed potatoes with a drizzle of lemon thyme butter sauce. $35.00*


Chicken Fettuccine Alfredo – Fettuccine noodles, snow pea pods, and mushrooms tossed in an Alfredo cream sauce and topped with a grilled chicken breast and parmesan cheese. $30.00*


Cobb Salad – Iceberg topped with turkey, ham, bacon, hard cooked eggs, avocado, diced tomoatoes, bleu cheese crumbles, and black olives with choice of dressing (Ranch, FF Ranch, Bleu Cheese, French, FF French, Italian, FF Italian, Balsamic Vinaigrette) $25.00*

8:00 pm

Presentation — Todd Christopherson, P.E., A.J. McGinn, P.E., PhD – Brierley Associates


* Paid 2013-2014 MGS Members receive a $5 meeting discount on the meal costs listed above. The cost to Full-time students is $5, payable to MGS at the door.


On-line Registration
Requested by 12 noon, Friday, May 9, 2014

PDF Announcement (108 kb)


(One professional development hour toward continuing education requirements for Professional Engineers is available.)
Please print, fill out and bring the New Membership Application to the next meeting. The form is found on our membership page.

Design of a Rescue Shaft for Bertha
Todd Christopherson, P.E., A.J. McGinn, P.E., PhD – Brierley Associates

Bertha, the largest Tunnel Boring Machine (TBM) in the world, was built for the Washington DOT and its Contractor, Seattle Tunnel Partners, to bore a 57 foot diameter tunnel through downtown Seattle. The tunnel will carry two levels of traffic when completed and will replace the aging two level viaduct for Highway SR99 that runs through Seattle. The planned tunnel route is 9,270 feet and in December 2013, Bertha had completed about 11% of the tunnel when it became stuck. In March, 2014 Brierley Associates was hired by the Contractor to design a “Rescue Shaft” to be built in front of the stalled TBM. Once the shaft is completed, the TBM will be moved forward into the shaft for repairs. The shaft design is approximately 80 feet in diameter and 120 feet deep and will include measures to hold back high groundwater. In addition, allowable ground settlements are extremely small due to the close proximity of the existing viaduct which remains in use until the new tunnel is operational. Representatives of Brierley Associates will give an overview of their geotechnical and structural design of this unique project.

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Meetings: 2013 - 2014

2013 - 2014

Description or Topic


Wednesday, October 9, 2013
PDF (99 kb)

Examples of Hypogenic Karst Collapse Structures in the Twin Cities Metropolitan Area
Kelton D. L. Barr, Braun Intertec Corporation
E. Calvin Alexander, Jr.; University of Minnesota, Minneapolis

Rose Vine Hall, Roseville, MN

Wednesday, November 13, 2013
PDF (100 kb)

USACE / CODEVASF Bank Stabilization and Navigation Program in Brazil
Kurt Heckendorf, P.E, U.S. Army Corps of Engineers

Rose Vine Hall, Roseville, MN

Wednesday, December 11, 2013
PDF (99 kb)

Jackson Bluff Auxiliary Spillway Hydroelectic Project
Nick Cmiel, P.E., Mead & Hunt

Rose Vine Hall, Roseville, MN

Wednesday, January 8, 2014
PDF (157 kb)

Prevention and Detection of Leakage from Dams and Reservoirs
Bethany Erfourth, P.E., Barr Engineering Company

Rose Vine Hall, Roseville, MN

Thursday, February 27, 2014
PDF (210 kb)

U of M Geotech Conference
Key Causes of Time-Dependent Behavior of Sand
Radoslaw L. Michalowski, the University of Michigan

Continuing Education Center, U of MN

Wednesday, March 12, 2014
PDF (157 kb)

Unsaturated Soil Mechanics: Principles and Applications
William Likos, University of WI

Rose Vine Hall, Roseville, MN

Wednesday, April 9, 2014
PDF (158 kb)

Highway 55/62 Interchange, Geosynthetic Liner System and Performance Monitoring
Brian Albrecht, Short Elliott Hendrickson

Rose Vine Hall, Roseville, MN

Wednesday, May 14, 2014

Design of a Rescue Shaft for Bertha
Todd Christopherson, P.E., A.J. McGinn, P.E., PhD., Brierly Associates

Rose Vine Hall, Roseville, MN

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