FIELD EXPERIMENT ON CHEMICAL MODIFIED TREATMENT OF EXPANSIVE SOIL EMBANKMENT

Expansive soil is a kind of special soils and can do huge harm to engineering project. This paper proposes a PAS chemistry treatment to expansive soil embankment. The modified principle and special construction craft of this new method is presented. The results of experimental study show that the swelling characteristics and strength parameters of modified expansive soil are changed obviously. The results indicate that PAS chemical treatment is an effective method for expansive embankment. Through the PAS treatment, the swelling and shrinking deformation can be reduced remarkably. The strength and the water stability can also be significantly improved. On the other hand, the PAS does not change the cultivate capacity of the soil. Plant fixed slope method can be adopted as ecology protection for the treated embankment slope. Comparing with long-distance replacements, specially in the area massively distributed with high plastic expansive soils, the PAS treatment has a very greatly economical superiority to be used.