Use of FEM Analyses to Evaluate Performance of Subgrade Stabilization Technique over Poor Soils
Publication: Geo-Congress 2022
ABSTRACT
Timely detection of hidden potential solution cavities subject to adverse subsurface conditions is a challenge, especially when located under active pavement areas. Site subsurface conditions for this study consisted of the subgrade layer reinforced by the existing geogrids overlying deeper untreated thick gypsum backfill. The tidal groundwater and/or rainfall infiltration caused dissolution of the gypsum, creating large voids in the subgrade. This paper describes how the use of Finite-Element Method (FEM) analyses provides a practical approach to help improve the prediction of performance for a unique Load-Transfer Platform (LTP) design. Considering various potential void diameters under applied vehicular live loads, parametric studies were conducted using the FEM approach to determine key design values (i.e., resulting forces on geogrid layers and a maximum settlement). Subsequently, by correlating surface settlement measurements to tensile load on each geogrid layer, project settlement criteria were developed to help facilitate scheduling of future pavement repairs of the LTP based on long-term effects on capacity of the geogrid layers.
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Geo-Congress 2022
Pages: 708 - 717
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Published online: Mar 17, 2022
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