Abstract
Preloaded and prestressed (PLPS) reinforced soil method, recently proposed, aims to increase substantially the stiffness of a geosynthetic-reinforced soil retaining wall by vertical preloading and prestressing. Its mechanisms are described. Rheological properties of the backfill soil, which are essential to the method, were determined from triaxial tests. Field full-scale model tests with gravel backfill during preloading and under prestress for more than a year is presented. The first practical project of PLPS reinforced soil pier for a railway is described. Most part of the initial prestress remains in a PLPS reinforced soil structure for at least one year under a static loading condition. Preloading makes the reinforced soil stiffer and elastic and introduces lateral tensional prestress in the reinforcement. A method to apply preload and prestress to a reinforced soil structure is established.
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