Study of operational control issues in jet grouting based on the parameters of the spoil return jet grouted material

Introduction. The jet grouting technology is considered to be one of the most relevant methods in geotechnics. Geotechnical structures based on this technology are hidden and require special control of the intended properties. Currently, the regulatory documentation primarily establishes control measures only after the completion of work on the stabilized soil that has gained strength. Such control methods has no impact on the results of the work but merely confirm it. The controlled influence on the results requires developing a method for operational process control in order to adjust the process in real-time and achieve the desired outcome. A solution to this issue may involve operational control of the stabilization quality based on the parameters of the soil-cement slurry discharged during jet grouting.

Aim. To investigate control issues in soil stabilization using jet grouting based on the physical and mechanical characteristics of the soil cement slurry discharged during the stabilization process.

Materials and methods. The study was conducted on samples obtained under laboratory conditions. The materials for the laboratory samples included fine, medium, and coarse sand; loam; clay; CEM 0 42.5N cement; water. Laboratory samples were created by mixing various compositions of the soil cement mixture, simulating the soil cement slurry that transforms into soil-cement during the hardening process. Studying the laboratory samples involved determining the density in a liquid state and the density and strength after hardening.

Results. The study revealed the dependence of an increase in the strength of soil cement on a growth in the density of soil cement slurry while changing the ratio of components of the slurry composition.

Conclusions. The conducted studies were instrumental in assessing the impact of the quantitative ratio of the components in the models of the soil-cement mixture (slurry) on its density and, as a result, on the strength and density of soil-cement samples.

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