Control of the stress-strain state of the coal seam rock mass in the transition zone during face operations past a mine working
DOI:
https://doi.org/10.33271/crpnmu/86.055Keywords:
traversing a technogenic zone, mathematical modeling of geomechanically processes, intensity, dependency, technological solutionsAbstract
Purpose. Determination of the mechanism governing the formation of the stress-strain state of a rock mass during the merging of the cross-section of an active mine working with a stope face area, achieved by reducing the pillar between them within the plane of a thin coal seam.
The methods. The mechanism governing the formation of the stress-strain state of the rock mass was investigated using mathematical modeling of geomechanically processes in the stratified rock mass of coal deposits and the finite element method (FEM), both of which account for the full range of geomechanical and mining-technical factors.
Findings. The study identified the technical aspects of establishing safety conditions within the combined zone to facilitate the operation of the mechanized system's kinematics and its movement across the plane. It confirmed the presence of stress-relief and stress-concentration zones within the rock mass—with magnitudes remaining within permissible limits-and highlighted a specific area characterized by rock caving without bridging over a significant span on the goaf side. A specific zone has been identified where rock collapse occurs over a large area on the side of the goaf without bridging. This aspect is critical when the dynamic abutment pressure zone of the longwall overlaps with the stationary abutment zone of a pre-existing man-made void in the longwall's path, as stress concentrations there may exceed the rock's failure threshold.
The originality. A directly proportional relationship has been established between the increase in normal stresses in the abutment zone-as well as their intensity-and the distance from the working face to a man-made void in the path of the advancing longwall; additionally, an inversely proportional relationship was found between the rate of change in the intensity of geomechanically phenomena in the rock mass surrounding the excavation and the distance between the longwall and the roadway during the superposition of their respective abutment pressure zones.
Practical implementation. Technological solutions have been developed to counteract strata pressure in the flank roadway transition zone, enabling the effective operation of a high-productivity mechanized longwall system without the need for assembly and disassembly operations. It is recommended to implement a support system within the disturbed zone that provides the necessary yield ability and load-bearing capacity to ensure safe mining operations.
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