Authors: M.A. Vlasov, O.V. Gerasimov, S.M. Prostov

Title of the article: Forecast of stability of the soil base of a mining facility with a slab foundation based on a volumetric geomechanical model

Year: 2025, Issue: 2, Pages: 22-36

Branch of knowledge: 1.6.9. Geophysics, geophysical methods of prospecting for minerals

Index UDK: 624.131.7

DOI: 10.26730/1999-4125-2025-2-22-36

Abstract: An emergency section of the construction of a fire protection folding door of a coal mine ventilation unit under construction is considered. According to the results of engineering and geological surveys, it was found that the main cause of dangerous deformations of the foundations of structures is the presence of a weak bearing layer of the base of bulk soil and coal, which contributes to increased deformations and displacements, the occurrence of a roll of the foundation plate. Based on engineering and geological surveys, two calculated finite element schemes of a volumetric model were developed, including a forecast of the stress-strain state (VAT) of the massif under natural and fixed conditions of the soil base. The calculated vertical sections were analyzed every 15 degrees relative to the center of the support, based on this, the most dangerous sections were determined, especially the sections (0, 45, 90, 135 degrees) with stress and strain distribution for both models of the soil foundation are characteristic. For a more accurate prediction of the stability of the base of the structure, integral VAT indicators were determined for each angle of rotation of the section with a natural soil foundation and when it is fixed. Based on the results of the geomechanical forecast, it was proposed to use additional injections in the zones of the most dangerous sections, which will increase the stability of the foundation, a plan and layout of the injectors were developed, the lengths of the injectors, the pitch and the zones of fixing the base. A comparison of the local and integral parameters of the VAT showed that the vertical normal stresses after fixing the weakened zone increased compared to the natural base, and the values of horizontal deformations of the base mass decreased. An assessment was made of improving the accuracy of calculating maximum stresses and deformations due to the volumetric formulation of the problem being solved, which amounted to 6.22% and 41.69%, respectively.

Key words: computer modeling mining engineering forecast stresses deformations soil fixation integral indicator calculation accuracy roll

Receiving date: 14.10.2024

Approval date: 22.01.2025

Publication date: 11.06.2025

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