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Next GSI webinar Nov. 9

News | November 2, 2016 | By:

GSI W-3 webinar:
MSE Wall Remediation and Monitoring
11:30 a.m.–1 p.m. (ET)
Wednesday, Nov. 9, 2016
GSI members: $200 USD
Non-GSI members: $250 USD 

Webinar Overview

The Geosynthetic Institute (GSI) database of failed MSE walls indicates that 44 out of 171 failures with geosynthetic reinforcement were caused by excessive deformation. Of these 44, 25 were remediated before they actually collapsed. This webinar presents methods of mechanical strengthening the deformed walls (using ground anchors, rock bolts or soil nailing) and also the potential of using dewatering methods (using horizontal drains, pumped vertical wells and combined systems).

This webinar presents details of 10 of the remediated walls. All of them were remediated using mechanical strengthening. Within the group were ground anchors (5), soil nails (4) and rebuilding (1). The cost of the remediations varied from 1.05 times the original cost to 3.50 times. The rebuild case history was 4.66 times the original cost. Monitoring of the original or remediated walls is suggested in the context of standard surveying, laser/radar/lider methods, slope inclinometers, piezometers and/or continuous deformation.

Learning Objectives

Webinar participants will appreciate that the time between visual observation of a deforming MSE wall and actual collapse is critical insofar as remediation is concerned. A review of ground modification methods will be presented. Ten case histories of wall remediation will be reviewed,all of which were successful except for the high cost. Estimates of the remediation costs vary from 1.05 to 3.50 times the original wall construction costs. Rebuilding is even higher. Since the acceptable amount of wall deformation is subjective, the use of monitoring is recommended. Participants will learn what is available in this regard.

Webinar Benefits

  • Participants will learn about deforming walls and the need for remediation before collapse.
  • A review of ground modification methods of mechanical strengthening and dewatering will be presented.
  • Details of 10 case histories of remediated MSE walls will be illustrated.
  • Reflection on the lack of ground dewatering techniques will be posed.
  • Participants will learn how much deformation these MSE walls can actually be anticipated (it’s large!).
  • Types of geotechnical monitoring will be presented along with how they are used in context of MSE walls.

Intended Audiences

Owners of MSE walls, berms, and slopes in both the 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; general civil consulting engineers; testing laboratories servicing these organizations; manufacturers and representatives 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.

Specific Topics Covered

  1. In-situ mechanical strengthening techniques
  2. In-situ dewatering methods
  3. Remediation case histories
  4. Cost of remediation
  5. Monitoring methods
  6. Summary comments

Webinar Instructor

The instructor is Dr. Robert M. Koerner, professor emeritus of civil engineering at Drexel University and director emeritus of the Geosynthetic Institute.

11:30 a.m.–1 p.m. (ET)
Wednesday, Nov. 9, 2016
GSI members: $200 USD
Non-GSI members: $250 USD

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