Evaluation of the interaction between the “mechanized support – rock mass” system to determine optimal advancement rates for the working face
DOI:
https://doi.org/10.33271/crpnmu/86.300Keywords:
mechanized support, force interaction, load, kinematic parameters, face advance rate, process downtime, stress-strain stateAbstract
Purpose. Justification of optimal operating parameters for mining complexes (face advance rate and maximum permitted downtime) by assessing the force interaction within the ‘mechanized support – rock mass’ system to prevent critical equipment overloads
The methods. A comprehensive approach was adopted, based on the analysis of in-mine instrumental observations and mathematical modelling of the stress-strain state using the MODEL software package (following the methodology of Prof. Savostyanov). The calculation scheme takes into account the kinematic characteristics of the machine (in particular, the shearer’s working width of 0.73 m), the resistance parameters of the hydraulic support system, and the physical and mechanical properties of the rock masses in the Western Donbas.
Findings. The mechanism by which external loads are generated on mining equipment as it moves away from the open-cut furnace has been investigated. It has been demonstrated that the first seven days of downtime at the working face constitute a critical period, during which intensive roof subsidence occurs, the working compliance of the hydraulic props is exhausted, and the support system transitions to a hazardous operating mode on a rigid base. A minimum rational advance rate (kinematic parameter) for the working face of over 4.8 m/day has been justified, which significantly reduces the force load on the sections. Taking geomechanical factors into account, it has been determined that the optimal half-span length of the longwall is 87.5 m, whilst the length of the cut-off pillar should be 1,800 m.
The originality. Patterns have been identified in the redistribution of bearing pressure and the force reaction of mechanized support, depending on the rate of face advance. It has been established that the load dynamics on the steel structures exhibit a distinctly non-linear character during operational downtime, with maximum stress concentration occurring near the face plane (in the pinch zone).
Practical implementation. The proposed kinematic and spatial parameters of the mining system make it possible to optimize the operating modes of the mining complexes. Their implementation will prevent critical overloads on the steel support structures, extend the service life of the equipment and improve the technical and economic efficiency of coal seam mining.
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