November Meeting Notice

Date:

November 10, 2011

Topic:

Prediction of Sand Aging Effects

Location:

Grandma's Canal Park
425 South Lake Avenue
Duluth, MN (MapQuest)

Time:

11:45 am

Registration and begin lunch buffet, including:

Grandma's Marathon Spaghetti
Grandma’s famous Marathon Spaghetti with meat and meatless sauces. Served with our fresh house salad and freshly baked Italian breadsticks.

12:00 pm

Presentation: Dr. David Saftner, University of Minnesota Duluth

Cost:

$17.00 members and non-members, and $10 full-time students, payable to MGS at the door. 

Reservations:

(Requested by 6 pm, Tuesday, November 8, 2011)

One professional development hour toward continuing education requirements for Professional Engineers is available.

PDF Announcement, 120 kb
Please print and fill out the New Member Application

Prediction of Sand Aging Effects

Dr. David Saftner, Assistant Professor
Department of Civil Engineering
University of Minnesota Duluth

This presentation describes field and laboratory geotechnical investigations of time-dependent increases in the strength of sand following disturbance, a phenomenon commonly called “sand aging.” While numerous case histories documenting sand aging exist, it is not completely understood. Strength increases typically manifest themselves as changes to cone penetration test (CPT) tip resistance, standard penetration test (SPT) N-value, or shear wave velocity (Vs) with time. Because in-situ test results are commonly used for quality assurance in soil improvement, understanding their time-dependence could prevent construction delays and decrease the amount of effort required to improve soil. As part of this project, three different instrumented soil improvements were conducted, including explosive compaction, GeoPier Impact Pier installation, and induction of liquefaction using a Network for Earthquake Engineering Simulation (NEES) mobile vibroseis system. Comparing the results from these field projects and laboratory tests isolated some of the proposed aging mechanisms and allowed for the development of a more detailed sand aging prediction method than was previously available.

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2011 - 2012
Meetings

Description or Topic

Location

Thursday, November 10, 2011

Prediction of Sand Aging Effects
Dr. David Saftner, Assistant Professor, Dept. of Civil Engineering
University of Minnesota Duluth

Grandma's Restaurant
425 South Lake Ave

TBD

TBA

Grandma's Restaurant
425 South Lake Ave