Thesis 2009 - Investigating composite behavior of Geosynthetic reinforced soil mass

[kundanili]

Thang Quyet Pham (Ph.D., Civil Engineering) “Investigating Composite Behavior of Geosynthetic-Reinforced Soil (GRS) Mass” Colorado US. 2009

ABSTRACT A study was undertaken to investigate the composite behavior of a Geosynthetic Reinforced Soil (GRS) mass. Many studies have been conducted on the behavior of GRS structures; however, the interactive behavior between the soil and geosynthetic reinforcement in a GRS mass has not been fully elucidated. Current design methods consider the reinforcement in a GRS structure as “tiebacks” and adopt a design concept the reinforcement strength, Tf, and reinforcement spacing, Sv, have the same effects on the performance of a GRS structure. This has encouraged the designers to use stronger reinforcement at larger spacing, as the use of larger spacing will generally reduce time and effort in construction. A series of large-size Generic Soil-Geosynthetic Composite (GSGC) tests were designed and conducted in the course of this study to examine the behavior of GRS mass under well-controlled conditions. The tests clearly demonstrated that reinforcement spacing has a much stronger effect on the performance of GRS mass than reinforcement strength. An analytical model was established to describe the relative contribution of reinforcement strength and reinforcement spacing. Based on the analytical model, equations for calculating the apparent cohesion of a GRS composite, the ultimate load carrying capacity of a reinforced.....

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