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

Title of the article: Correction of uneven precipitation of the foundation of the shaft ventilation system

Year: 2025, Issue: 4, Pages: 5-17

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

Index UDK: 624.131.7

DOI: 10.26730/1999-4125-2025-4-5-17

Abstract: The results of controlling the displacements of two foundation slabs of a fire protection folding door and for the main ventilation fan of a mining facility are presented. Due to the presence of a weak bearing layer of bulk soil and coal at the base of the foundation plate of a fire protection folding door deck, uneven increased precipitation occurred, which led to the appearance of a roll of the facilities. A technique for injection of the solution cement-sand mortar has been developed to prevent the difference the sediment of the foundation. Based on the results of quality control of the work performed, a graph of precipitation changes at two points of geodetic measurements is presented. The foundation plate of the main ventilation fan is located on an inhomogeneous ground base, which also contributes to the occurrence of deformations and uneven precipitation, in addition, the presence of massive equipment contributes to an increase in the edge pressure at the edges of the foundation plate. Based on the analysis, it was proposed to fix the soil base along the edges of the foundation plate and the outside of the structure. Geomechanical modeling was performed to assess the effectiveness of the fixing. The plans of geodetic monitoring objects before and after fixing for two foundation slabs and calculation schemes of the corresponding volumetric geomechanical models are presented. The discrepancies in the values of displacements obtained by methods of geodetic monitoring of the foundation of the fire protection folding door and geomechanical calculations, performed in the Plaxis 3D software package amounted to 0-33% for the natural state of the base, 3-50% for the fixed base, and 13.26% when comparing the values for 8 reference points. For the base of the main ventilation fan, the corresponding discrepancies were 1-9% and 0-13%, with an average value of 3.64% for 9 reference points. Thanks to the developed technique for managing the properties of the soil base, it was possible to stabilize the values of the foundation movements and prevent the roll of the foundation plate of the fire protection folding door. In addition, by fixing the base plate of the main ventilation fan, it was possible to reduce the pressure at the edges of the plate and stabilize the displacement values.

Key words: computer modeling mining engineering forecast displacement soil fixation calculation accuracy

Receiving date: 07.12.2024

Approval date: 22.04.2025

Publication date: 28.09.2025

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