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Results of the research of the influence of overworking on mininging workings fixed by arched supports made of
composite materials
I. Sheka1*
1Dnipro University
of Technology, Dnipro, Ukraine
*Corresponding author:
e-mail: vsheka1996@gmail.com
Physical and technical
problems of mining production, 2023, (25), 67-79.
https://doi.org/10.37101/ftpgv25.01.006
full text (pdf)
ABSTRACT
Purpose. Analysis of the effect of overworking
on the mining workings fixed by arched supports made of composite
materials.
Methods. The computational
experiment was carried out on the basis of
three-dimensional modeling of the geomechanical
system of the preparatory work with a layered rock massif overworked by
longwall, using the finite element method using non-linear regularities of
changes in the stress-strain state of the object under study.
Findings. The developed calculation
models of the geomechanical system made it
possible to determine the deformation pattern of the composite fastener for
its various cross-sections. the highest stress
concentration is observed when using a basic metal fastener. The region σmax extends to 1.2 m and 1 m,
respectively, after which a uniform reduction of stresses begins. The
region with maximum stresses is formed in the
central part of the upper part with a slight inclination to the left. At
the same time, when the cross-section of the composite fastener increases
to 39, a gradual decrease in the σmax
areas is observed. The results of the research
allow us to obtain the most complete picture of the stress-strain state of
the composite fastening of mine workings. On the basis of
the conducted experiments, it is possible to determine with a high degree
of objectivity the shortcomings of the composite fastening system, which
will be the basis for the development of rational fastening parameters from
composite materials at great depths.
Originality. For the first time, a
three-dimensional model of a layered massif with a composite fastening
system of various cross-sections was developed and calculated. It was established that when installing a composite
fastener with a cross-section of 39, the σmax
regions have the smallest values.
Practical implications. The obtained results prove
that it is better to use a composite fastener with a cross-section of 39
when working overtime, which, together with the lightening of the structure
and speeding up the work of the shift, will contribute to the development
of underground coal mining.
Keywords: mine workings,
composite support, maximum stresses, modeling, overworking, stress-strain
state
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