Abstract
A soft roadbed causes an increment of existing track maintenance work. Therefore the chemically stabilized method is often adopted for improvement of existing railway roadbed in order to lighten the burden on track maintenance work. Thus, it is necessary to investigate the durability of chemically stabilized soil under repeated train load. The present paper gives an outline of the static and cyclic loading tests for investigating the basic characteristic and durability under repeated load of chemically stabilized soil. The result from cyclic loading test shows that the strength of chemically stabilized soil has to be more than 5 times the cyclic stress in order to keep durability of chemically stabilized soil under train load.
