DVGI Event Calendar for 2014 - 2015
Dinner Meeting: Tuesday, November 18, 2014
TOPIC: In-Situ Stabilization of Soil Slopes Using Nailed or Anchored Geosynthetic
SPEAKERS: Robert M. Koerner, Ph. D., P.E., NAE Emeritus Director and Emeritus Professor, Geosynthetic Institute and Drexel University
LOCATION: Valley Forge Casino (formerly Radisson Valley Forge), 1160 First Avenue, King of Prussia, PA
TIME: Social Hour - 5:30pm, Dinner - 6:30pm, Presentation - 7:15pm
Shallow soil slope stability failures, aka landslides, represent a $2 to 5 B annual expense in America alone and worldwide the situation is obviously far greater. Sometimes fatalities are involved as they were in the 2014 Oso, Washington mudflow slide. The usual causes are due to gravity, seismicity, surcharges and invariably water. The resulting failure surfaces are either rotational or translational and the geotechnical literature is well positioned for proper design and subsequent forensic analysis in the case of failure. This presentation illustrates the details of an in-situ stabilization method which uses a geosynthetic material (geonet, geotextile or erosion control product) on the slope’s surface which is then fixed-in-place and/or tensioned by means of soil nails or ground anchors. The requisite theory (either simplified Bishop or Corps of Engineers methods) is modified for the above mechanisms and numeric examples of improved FS-values using the method are offered. While the technique was dormant for a number of years after it was first developed by the author, it has recently “taken-off” with at least ten companies offering varied approaches for their respective solutions. Each approach will be illustrated and discussed in the context of type of reinforcement, densification capabilities and surface erosion control.
Dr. Robert M. Koerner is Professor Emeritus of Civil Engineering at Drexel University and Founding Director Emeritus of the Geosynthetic Institute. Educated and trained as a geotechnical engineer he segued into geosynthetics in 1977. As a result, the last 37-years were fully focused on teaching, research, writing and advising in geosynthetics. He is a registered Professional Engineer, a Distinguished Member of ASCE, a Diplomate of the GeoInstitute and a member of the National Academy of Engineering. Bob has authored and co-authored about 700 papers on geosynthetics and geotechnical topics in journals and at national and international conferences. His most widely used publication is the sixth edition of the textbook entitled “Designing with Geosynthetics”.
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Other Professional Society Events for 2014 - 2015