Abstract
The preloaded and prestressed (PLPS) reinforced soil method aims at substantially increasing the stiffness of a geosynthetic-reinforced soil embankment by vertical preloading and prestressing. The first prototype PLPS reinforced soil pier for a railway was constructed, and preloaded and prestressed, which has been opened to service for more than 1 year. Long-term measurements for more than 2 years are described. The PLPS pier showed very small amount of instantaneous and creep compression by dead load and live train load. In addition, some new design and construction methods are proposed which can keep high stiffness for a long time and can improve its constructibility.
