Local stability of soil-cement columns above undergraoud excavations
DOI:
https://doi.org/10.26906/znp.2026.66.4402Keywords:
soil-cement columns, jet grouting, underground excavation, dynamic loading, hydrogeological conditions, geotechnical riskAbstract
The paper studies local stability of soil-cement elements (SC) formed by a jet grouting technology within the zone influenced by underground excavation. The research topicality is stipulated by the accident taken place in 2021 during metro construction in the city of Dnipro and the need to assess risks during excavation in strengthened foundations. The aim of the study is to determine the influence of the geometric parameters of SCs and reduction of their strength on the stability of rock mass above the excavation. The conditions of the accident development are analyzed, including hydrogeological regime, dynamic loads from drilling-and-blasting operations, and disturbance of soil structure. It is defined that deviations of the SC dimensions from the design values and a decreasing strength along the SC lateral surface significantly reduce the excavation roof stability. A considerable influence of dynamic loads on stability loss is confirmed. Practical recommendations are formulated to improve the reliability of geotechnical systems and reduce accident risks.
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Copyright (c) 2026 Oleksandr Skobenko, Mykola Topal, Volodymyr Shapoval, Nataliia Dereviahina
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