Development of jet cementation technology for permafrost soils used according to principle II

Introduction. The main cause of foundation deformation in Arctic structures is the significant compressibility of permafrost soils during thawing. These processes are accelerated by anthropogenic impacts and climate change; according to Roshydromet, the rate of warming in the region is reaching 0.5°C per decade. These conditions require the development of methods that not only strengthen structures but also dramatically improve the deformation properties of the soil base itself. Soil stabilization using jet grouting is being considered as a promising solution. The key effect is the virtual elimination of subsidence during thawing. Therefore, stabilization and reinforcement of high-temperature frozen soils appears to be an effective technology for ensuring the long-term stability of foundations in the permafrost zone.

Aim. Development of jet grouting technology in conditions of high-temperature frozen soils (above minus 0.5 °C) to enable simultaneous thawing and reinforcement of the foundation, and an assessment of the degree of change in the deformation properties of frozen soil after thawing and consolidation.

Materials and methods. The methodology consists in analyzing archival survey and design documentation, as well as regulatory and other technical literature on the topic of work, identifying areas for further experimental research, analyzing and summarizing them, as well as developing recommendations for the use of jet cementation technology for permafrost soils used according to principle II.

Results. The results of the analysis of modern scientific, technical, normative and methodological literature are presented. Laboratory studies were performed to determine the physical, thermophysical and deformation properties of the soil in its natural state and fixed, which were later used in modeling the thermal effects from the device of soil cement elements, as well as in computational and analytical research using the example of subsidence calculation. Recommendations have been issued on the use of jet cementation technology for fixing foundations in areas of permafrost soils used according to principle II.

Conclusions. Based on the analysis of the literature, the results of experimental studies and studies on the consolidation of high-temperature permafrost soils, recommendations have been developed for the use of jet cementation technology for the consolidation of foundations within the framework of the distribution of permafrost soils used according to principle II. Proposals have been developed for the application of R&D results in the development and modification of regulatory, technical and methodological documents.

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