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# GSI to host webinar on stability in landfill cover soils

Events | December 7, 2020 | By:

The Geosynthetic Institute (GSI) will sponsor a webinar, “Stability Design of Landfill Cover Soils,” on December 16, from 11:30 a.m. to 1 p.m. EST. Geosynthetic Materials Association (GMA) member companies and their employees receive discounted rates on all GSI webinar and short course registrations.

This webinar focuses on the stability design of relatively thin soil layers over geosynthetics as in typical landfill liners and covers. They are often called “veneer” cover soils. It also applies to cover soils over liners of ponds and surface impoundments. After illustrating several failures (actually, cover soil slides), the geotechnical basis of design is presented. Obviously, direct shear testing of geosynthetics and soil are included in the necessary input values. They are described accordingly.

Computational details of a veneer cover soil’s stability are generated resulting in a quadratic equation solution. This solution to a standard example is presented. It is then numerically extended insofar as gravitational forces, construction equipment, seepage forces and seismic forces are concerned. Each decreases the factor of safety (FS) value of the standard example. Alternatively, the emphasis is then changed to actions that increase the FS values of the standard example. They are toe (or buttress) berms, tapered cover soils, intentional reinforcement and nonintentional reinforcement. This set of nine discrete numeric examples is summarized and commented upon, and is followed with conclusions and recommendations.

Participants will learn the analytic methodology of calculating FS values for veneer soil stability as exemplified in landfill liner and cover soils. The process utilizes limit equilibrium techniques common to geotechnical engineering. Its adaptations to geosynthetic engineering will be seen to be straightforward. The ultimate objective is a safe and secure veneer cover soil system in landfill and related applications. The technique is also appropriate in solving many transportation and infrastructure situations as well.

Webinar benefits

1. Appreciate the number and idiosyncrasies of veneer cover soil failures
2. Understand the analytic technique of limit equilibrium as applies to soils and geosynthetics for this application
3. Learn about situations which decrease cover soil stability
4. Learn about situations which increase cover soil stability
5. Understand the implications of defined and recommended FS-values Intended Audiences

This webinar will be beneficial to public and private owners/operators of landfills, heap leach mining operations, combustion coal residuals and related solid waste facilities; consultants and designers in the public and private sector; regulators and agency personnel at the federal, state and local levels; geosynthetic manufacturers and their representatives; geotechnical and geosynthetic testing organization personnel; contractors and installers of liner and cover systems; academic and research groups; and others desiring technically related information on this important aspect of our constructed environment.

Webinar instructor

George R. Koerner, Ph.D., P.E., and CQQ, is the director of the Geosynthetic Institute. He is in charge of laboratory accreditation, field certification and continuing education at the institute. He also manages several research projects and has published more than 350 technical papers in his 35-year association with polymers used in below-ground construction. Koerner’s Ph.D. is from Drexel University in geotechnical engineering. He is a registered professional engineer and a certified quality auditor. Koerner has received many awards over the years. The most notable being IFAI’s Environmental Technologies Award of Excellence 1995, ASCE’s DVGI Geotechnical Engineer of the year in 2004, the title of ASTM Fellow in 2013 and GMA’s first Robert M. Koerner Lecture and Award in 2017.

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Webinars cost \$200.00 for GSI and GMA members, and \$250.00 for nonmembers. Successful completion of a multiple-choice test after the webinar carries 1.5 professional development hours (PDH).