Abstract: Silty soils are widely distributed in delta areas in China. Due to its large void ratio, small bearing capacity and large deformation characteristics, engineering construction in these soils will likely induce safety and stability hazards. The solidified silty soil in the Taihu Basin of Suzhou is presented in this paper. The fly ash, mineral powder and lime were used as solidification materials to prepare the solidified silt soil samples. Throughout the compaction tests, unconfined compressive strength tests and rapid compression tests, the ratio of solidified material in soil samples was analyzed. and curing age on the compaction properties, unconfined compressive strength and compression properties of solidified silty soil samples, and the relationship between the engineering properties and influencing factors of solidified silty soil samples was obtained. The test results show that, the maximum dry density of the solidified silty soil samples decreases with the increase of the solidification material content, and the optimal moisture content shows the opposite trend; the unconfined compressive strength of the solidified silty soil samples increases with the solidification material content. As the value increases, the failure type tends to be brittle failure. The void ratio and compression coefficient of the solidified silty soil samples decrease with the increase in the amount of solidified material.

Key words: Solidified Silt, Stress-Strain Relationship, Compression Characteristics, Mineral Powder, Fly Ash