Observing and Improving the Performance of Two-Stage Mechanically Stabilized Earth (MSE) Walls
by T. M. Gerber, Ph.D., P.E., M.ASCE, (Assist. Prof., Dept. of Civil and Environ. Eng., Brigham Young University, 368 CB, Provo, UT 84602. E-mail: tgerber@byu.edu)
Section: Slopes, Embankments, and Earth Retaining Structures, pp. 3459-3468, (doi: http://dx.doi.org/10.1061/41165(397)354)
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| Document type: |
Conference Proceeding Paper |
| Part of: |
Geo-Frontiers 2011: Advances in Geotechnical Engineering |
| Abstract: |
A newer variation of Mechanically Stabilized Earth (MSE) wall, often referred to as a two-stage wall, uses vertical welded wire mesh panels (with geosynthetic fabric facing) in lieu of concrete panels to retain backfill. Two-stage walls are widely used in Utah where soft foundation soils can compress and damage the concrete panels of standard MSE walls. Given the relatively short performance history of two-stage MSE walls, together with the recognition that MSE walls are structures with limited service life (not unlike bridges) which require inspection to assess their condition and assure their serviceability, a study involving inspection and risk assessment was undertaken for the Utah Department of Transportation’s MSE wall inventory. Based on inspection data, it appears that two-stage walls up to 10 to 12 years old are generally performing similarly to one-stage MSE walls types, with settlement and drainage related issues being the most prevalent. Corrosion does not appear to be extensive at this time. Based on the results of the inspections, a review of case histories, and input of a panel of experienced persons convened for the risk assessment, specific recommendations for improved design and construction procedures for two-stage MSE walls were developed and are presented herein. |
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