Аннотация
Deep soil cementation is widely used for strengthening weak soils; however, the effectiveness of injection mortars largely depends on their penetration ability and interaction with in-situ soil conditions. This study aims to evaluate the performance of an injection mortar through large-scale model testing under conditions as realistic as possible. The experiments were conducted at a scale of 1:25 using loamy soils representative of Astana’s engineering-geological conditions. The model soil was prepared by reproducing natural density and moisture parameters, including an average natural density of 1.85 g/cm³ and moisture content of 13.3%, while overburden pressure was simulated using a rigidly fixed cover. Laboratory tests determined consistency limits (plastic limit 14.42%, liquid limit 19.75%), indicating a semi-solid to solid soil state. A strong correlation (R = 0.99) between added water and achieved moisture content was established, with an optimal water volume of 18,900 cm³ required to achieve target conditions. Compaction tests showed that the required density was achieved with 20-50 roller passes depending on layer depth, resulting in final densities of 1.85-1.88 g/cm³. The results confirm that the proposed modeling approach reliably reproduces in-situ conditions and can be effectively used to assess injection mortar performance in weak soil stabilization.