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Change of the sorption
properties of coals destroyed under the action of shear stresses V.A. Vasylkivskyi1*, 1Institute for Physics of Mining Processes the National Academy
Sciences of Ukraine, Dnipro, Ukraine Corresponding author: e-mail: lod.vasylkivskyi@ukr.net Physical and
technical problems of mining production, 2019, (21), 32-42. https://doi.org/10.37101/ftpgp21.01.002 ABSTRACT Purpose. To study the sorption properties and
kinetics of methane desorption for coals that underwent destruction under the
action of shear stresses and to identify the relationship
between the level of stresses and the characteristic relaxation time of
desorption. Methods. The destruction of cubic coal samples
by shear deformations was carried out using a triaxial press. For failure, shear stress levels of 4 MPa
and 14 MPa were used. A volumetric method was used
to study the process of desorption of methane from coal. A new method for
analyzing experimental results based on the idea of a change in the
characteristic relaxation time of desorption upon methane emission was used. Results. On the basis of
experimental data, the kinetics parameters of methane desorption from three
coal samples were determined: initial and destroyed by shear stresses of
various levels. A comparison of the kinetics parameters showed that with an
increase in shear stresses, the characteristic methane desorption time
decreases, the effective methane diffusion coefficient increases, and the
sorption capacity of coal decreases. A qualitative and quantitative analysis
of alternative interpretations of the features of changes in the kinetic
parameters of methane desorption from coal destroyed by shear stresses of
various levels is carried out. Originality. An analysis of the
experimental results in a dynamic sorption model suggests that all the
features of the sorption kinetics are due only to the energy of interaction
of methane with coal. For the first time, the dependence of the interaction
energy of methane with coal substance on the value of the tangential stresses
that destroy coal is revealed. Practical implications. The results of the
study make it possible to diagnose the level of shear stresses in the coal
seam using coal samples and can be used to predict
gas-dynamic phenomena. Keywords: characteristic time,
relaxation of the desorption process, level of shear stresses, interaction
energy, volumetric method, emission, methane desorption, coal microstructure,
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