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ArticleName Practical aspects of induced structurization of rock mass
DOI 10.17580/gzh.2022.03.01
ArticleAuthor Kozyreva E. N., Shinkevich M. V.

Institute of Coal, Federal Research Center for Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia:

E. N. Kozyreva, Head of Laboratory, Candidate of Engineering Sciences
M. V. Shinkevich, Senior Researcher, Candidate of Engineering Sciences,


Ground control is connected with monitoring of deformations of enclosing rock mass in the course of mining for ensuring stability of underground openings. One of the negative consequences of redistribution of rock pressure in an extraction panel during mining operations is swelling of floor rocks. The present article considers mining conditions of coal seams using the features of formation and development of nonlinear structurization of rock mass during longwall advance, earlier revealed at the Institute of Coal. The calculation basis is the developed parametrical model of geomechanical processes in rock mass during mining using the longwall top coal caving method. The rock mass is considered at the first approximation as a uniform isotropic medium without regard to mechanical properties of rocks. The model rock mass is presented as a set of manmade geomechanical layers. Their formation begins from a coal seam being mined and develops with the longwall advance with regard to elastic energy of rock mass. In the manmade change of external conditions, the rock mass rebates its energy potential via arching and movement. The bodies of “arches of movement” tend to paraboloids in shape. Formation of such shapes corresponds to the concept of minimum energy spend for the creation of a new surface under uniaxial unloading. The height of the arches-paraboloids is equal to the thickness of geomechanical layers at different scales of the structural hierarchy of rock mass. The horizontal dimension of the archesparaboloids is divisible by a longwall length. It is possible to detect sites of increased rock pressure applied to the boundaries and roof support of underground openings by means of geometrical overlapping of circles having diameters equal to the basal parts of displacement arches with load-bearing edges. Integration of the displacement arches of the adjacent extraction panels leads to connection of their mined-out areas and to gas cross-flow between them. The cardinally new approach to understanding geomechanical processes in rock mass can allow predicting adverse phenomena of rock pressure and the increased methane emission during high-rate longwalling.

keywords Rock mass, coal seam, geomechanical processes, extraction panel, methane emission, rock mass structurization, rock pressure, longwall

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23. Available at: (accessed: 15.06.2021).

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