2025 Volume 20 Issue 3 Pages 415-422
In the land development by cutting and embanking, it is basic to balance the cutting and the embanking within the project area, including not only the commercial land but also the construction of the regulating reservoir for disaster prevention, which is an attached facility. The embankment soil to construct the regulation reservoir was planning to use the excavated soil from the embankment foundation and the reservoir area, but the strength required to ensure the embankment slope stability was insufficient, so it was decided to use after improving the excavated soil by cement. This paper presents that the compaction and strength characteristics of cement-improved soil investigated by laboratory cement mixing test, the determining method of the effective stress strength parameters of cement-improved soil necessary for the stability analysis, the determining method of the cement amount to achieve the required strength on site, the strength quality controlling method of the cement-improved soil, and the results of confirming the applicability of these method to an actual construction site.
