Combined Effects of Corrosion and Migration of Fines on Stability of Mechanically Stabilized Earth Walls
Publication: Geo-Congress 2023
ABSTRACT
Mechanically stabilized earth (MSE) walls have been used extensively in transportation systems that are designed for a service life of several decades. MSE walls often include steel strips’ reinforcement (typically galvanized steel strips) within granular backfill to stabilize the backfill through anchorage. In MSE walls, the reinforcement may rupture or be pulled out from granular backfill. In the current MSE wall design method, the strength and pullout resistance of reinforcements are evaluated to ensure the stability of the walls. The pullout resistance represents the reinforcement-backfill interaction. Due to environmental effects, some reinforcements deteriorate by corrosion and lose their structural capacities. Moreover, water cycles from precipitation promote migration of fines through the granular backfill. Migrating fines may accumulate in the granular backfill, clog drainage, and retain water—which in turn accelerates the corrosion process—and affect the reinforcement-backfill interaction. Therefore, corrosion and migration of fines could affect the strength and the mobilization of tension in the reinforcement. So far, limited studies have been carried out to investigate the performance and behaviors of the MSE walls when they are subjected to both corrosion and migration of fines. The focus of this parametric study is to investigate the combined effects of corrosion and migration of fines on the global stability of MSE walls. The limit equilibrium (i.e., the Bishop simplified method) in ReSSA Version 3.0 program was used to determine the potential failure surfaces in the walls and calculate their corresponding factors of safety. The combined effects were simulated by varying the properties of steel strips and reinforced fill. The results indicated that when corrosion (with a degree of 50%) was simulated, the factor of safety marginally decreased by approximately 9.5%. However, when both corrosion (with a degree of 50%) and migration of fines (with fines content of 15%) were simulated, the factor of safety decreased by approximately 13.5%.
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REFERENCES
AASHTO. (2014). AASHTO LRFD bridge design specifications, 7th Ed., Washington, DC.
Berg, R. R., Christopher, B. R., and Samtani, N. C. (2009). Design and construction of mechanically stabilized earth walls and reinforced soil slopes. US Department of Transportation, Federal Highway Administration, National Highway Institute.
Bozorgzadeh, N., Bathurst, R. J., and Allen, T. M. (2020). “Influence of corrosion on reliability-based design of steel grid MSE walls.” Structural Safety, 84, 101914.
Breckwoldt, C., Parsons, R. L., and Han, J. (2019). Investigation of Variations in Corrosion Potential in Mechanically Stabilized Earth Backfill Due to Migration of Fines. University of Kansas. Dept. of Civil, Environmental and Architectural Engineering.
Bourgeois, E., Corfdir, A., and Chau, T. L. (2013). “Analysis of long-term deformations of MSE walls based on various corrosion scenarios.” Soils and foundations, 53(2), 259–271.
Chida, S., and Nakagaki, M. (1979). “Test and experiment on a full-scale model of reinforced earth wall.” Proceedings of the International Conference on Soil Reinforcement, vol. 2. 533–538.
Elias, V., Fishman, K., Christopher, B. R., Berg, R. R., and Berg, R. R. (2009). Corrosion/degradation of soil reinforcements for mechanically stabilized earth walls and reinforced soil slopes. National Highway Institute (US).
Han, J., and Leshchinsky, D. (2004). “Limit equilibrium and continuum mechanics-based numerical methods for analyzing stability of MSE walls.” In 17th ASCE Engineering Mechanics Conference, 13–16. Newark, DE: University of Delaware.
Han, J., and Leshchinsky, D. (2010). “Analysis of back-to-back mechanically stabilized earth walls.” Geotextiles and Geomembranes, 28(3), 262–267.
Jiang, Y., Han, J., Parsons, R. L., and Brennan, J. J. (2016). “Field instrumentation and evaluation of modular-block MSE walls with secondary geogrid layers.” Journal of Geotechnical and Geoenvironmental Engineering, 142(12), 05016002.
Kim, D., Nam, B. H., and Youn, H. (2018). “Effect of clay content on the shear strength of clay–sand mixture.” International Journal of Geo-Engineering, 9(1), 1–12.
Lade, P. V., Liggio, C. D., and Yamamuro, J. A. (1998). “Effects of non-plastic fines on minimum and maximum void ratios of sand.” Geotechnical testing journal, 21, 336–347.
Samtani, N. C., and Nowatzki, E. A. (2021). Mechanically stabilized earth (MSE) wall fills a framework for use of local available sustainable resources (LASR). US Department of Transportation, Federal Highway Administration, National Highway Institute.
Rahmaninezhad, S. M. (2019). Geosynthetic-reinforced retaining walls with flexible facing subjected to footing loading (Doctoral dissertation, University of Kansas).
Rahmaninezhad, S. M., and Han, J. (2021). “Lateral facing deflections of geosynthetic-reinforced retaining walls under footing loading.” Transportation Geotechnics, 30, 100594.
Rahmaninezhad, S. M., Han, J., Kakrasul, J. I., and Weldu, M. (2018). “Stress distributions and pullout responses of extensible and inextensible reinforcement in soil using different normal loading methods.” Geotechnical Testing Journal, 42(6).
Rahmaninezhad, S. M., Han, J., and Al-Naddaf, M. (2020). “Limit equilibrium analysis of geosynthetic-reinforced retaining walls subjected to footing loading.” Geo-Congress 2020: Engineering, Monitoring, and Management of Geotechnical Infrastructure. 464–471.
Rahmaninezhad, S. M., Han, J., Al-Naddaf, M., and Mamaghanian, J. (2021). “Limit equilibrium analysis of geosynthetic-reinforced retaining wall-supported footings.” Geosynthetic Conference 2021 Proceedings. 691–701.
Thornley, J. D., and Siddharthan, R. V. (2010). “Effects of corrosion aggressiveness on MSE wall stability in nevada.” Earth Retention Conference 3, 539–547.
Thornley, J. D., Siddharthan, R. V., Luke, B., and Salazar, J. M. (2010). “Investigation and implications of mechanically stabilized earth wall corrosion in Nevada.” Transportation research record, 2186(1), 154–160.
Weldu, M. T., Han, J., Rahmaninezhad, S. M., Parsons, R. L., Kakrasul, J. I., and Jiang, Y. (2016). “Effect of aggregate uniformity on pullout resistance of steel strip reinforcement.” Transportation Research Record, 2579(1), 1–7.
Yu, Y., Bathurst, R. J., and Miyata, Y. (2015). “Numerical analysis of a mechanically stabilized earth wall reinforced with steel strips.” Soils and Foundations, 55(3), 536–547.
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Geo-Congress 2023
Pages: 327 - 334
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Published online: Mar 23, 2023
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