STUDY OF THE FLOOR HEAVE MECHANISM IN GOB-SIDE ENTRY RETAINING
DOI:
https://doi.org/10.32782/3041-2080/2025-5-34Keywords:
floor heave, stress, strain, gob-side entry retaining, mine roadway stabilityAbstract
Reuse of gateroads is one of the main modern trends in underground longwall mining of coal seams. Pillarless mining techniques are more often used outside Europe, which extends the relevance of this mining method. The main restrictive factor of the gob-side entry retaining is the difficulty of ensuring gateroad’s stability. At the same time, the unresolved part of the problem of gateroads stability is still the dramatic floor heave and the asymmetric loading of the support system. Ukrainian and foreign scientists had been devoting their researches to the floor heave issue in various mining and geological conditions over the past hundred years. Based on this, three conceptually different floor heave mechanisms were developed. However, in-situ, it is extremely difficult to classify the floor heave cases according to classical mechanisms, especially in panels with modern mining equipment and gateroad support system. Vary factors have a simultaneous and unequal influence on the floor heave. This reduces the effectiveness of traditional floor heave control methods. Thus, effective floor heave control is possible only after studying the evolution mechanism of this process in modern conditions. In this regard, this work has conducted a study of the stress-strain state of surrounding rocks in the gob-side entry. The main research method is the finite element method, implemented in the ANSYS software. Based on the numerical simulation, the mechanism of the floor heave evolution in gob-side entry was investigated. A hypothesis of the floor heave evolution was proposed, which forms the basis for searching effective ways to control the floor heave in the specified engineering conditions.
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