Abstract: The cement mixed soil is a unique material formed by artificially mixing cement and soil. The strength of the cement mixed soil is related to many factors such as cement mixed soil strength grade, physical and mechanical properties of original soil, and mixing times and uniformity. By studying the strength increment features of 90 days curing time of the indoor prepared cement mixed soil samples and the on-site soil-cement columns, this article proposes a formula to predict the age-related strength and characteristic value of vertical bearing capacity of cement mixed soil and soil-cement column the acceptance test methods of the age-related soil-cement columns.

Key words: mixing ratio tests, cement-soil mixed soil strength, static load test, characteristic value of vertical bearing capacity