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The Geosynthetic Institute (GSI) will sponsor a webinar entitled “MSE Wall Back Drainage Design,” on May 23, 2018, from 11:30 a.m. to 1 p.m. EDT.
Within GSI’s database of 301 failed mechanically stabilized earth (MSE) walls reinforced with geogrids or geotextiles, 64% have failed due to water. Furthermore, 73% have been constructed with fine-grained silt or clay soils. Taken together, these low-permeability backfill soils do not drain easily and build up hydrostatic pressure leading to failures. To avoid such pressures, back drainage is necessary between the reinforced and retained soil zones. This webinar focuses on the proper design of this back drainage zone and its outlet system beneath the reinforced soil zone. The design is applicable to sand as the back drainage material, however, its near vertical orientation lends toward geocomposite drainage systems. Ten different geocomposites are tested for their transmissivity and illustrated in the four numeric examples that are presented. In all cases, a flow rate factor of safety is developed and assessed accordingly.
This webinar will be useful for owners of MSE walls, berms and slopes in both public and private sectors; federal, state and regional geotechnical, transportation, and environmental engineers; engineers from municipal districts and townships; private and municipal land developers, architectural and landscape designers; civil consulting engineers; testing laboratories servicing these organizations and professionals; manufacturers of geosynthetic materials; contractors and installers of MSE walls, berms and steep soil slopes; academic and research groups; and others desiring technically related information on this important aspect of our constructed infrastructure.
The webinar will be taught by Dr. Robert M. Koerner, professor emeritus of civil engineering at Drexel University and director emeritus of the Geosynthetic Institute.
Webinars cost $200.00 for GSI members and $250.00 for nonmembers. Successful completion of a multiple-choice test after the webinar carries 1.5 professional development units.
For more information or to register, visit http://www.geosynthetic-institute.org/webinar.htm.