Abstract: The three states of saline soil are different from the common soil, the salt liquor and salt in soil granule have a homeostasis with the changing of the outside environment (such as temperature, humidity and artificialness), there may be easy to have engineering disasters when the saline soil is used in roadbed, such as the frost boil, the expansion of saline soil, the dissolve falling, the roadbed soil pickled and so on. Aiming at analyzing the saline soil characteristics and the improving mechanism, the treated method is brought forward. The results of study indicate that adding the improving stabilizer into saline soil can improve the CBR property greatly and can meliorate the stability of sucking water clearly, make the soil melioration, finally, gain the solution of the problem of the disasters in roadbed.

Key words: saline soil, roadbed treatment, disaster analysis, roadbed filling