Antsiferov, A.

Dovbnich, M.

Kanin, V.

Viktosenko, I.

Geofizicheskiy Zhurnal

Наукова електронна бібліотека періодичних видань НАН України (Vernadsky National Library of Ukraine)

	  !"#$%&'!$'(")*"&"'%!%%+",$'(("--&'.The nature and prediction of regional zoning for dynamicphenomena in mines of the Donets Coal Basin A. Antsiferov1, M. Dovbnich2, V. Kanin1, I. Viktosenko2, 20101UkrNIMI, National Academy of Sceinces of Ukraine, Donetsk, Ukraineukrnimi@ukrnimi.donetsk.ua2National Mining University, Dnepropetrovsk, Ukrainedovbnichm@mail.ruThe Donets Coal Basin is the basic fuel and ener-gy region of Ukraine. Promotion of safety measures(accident prevention) in mining is the main industri-al and functional problem of coal-mining companiesthat requires the very careful attention and scienti-fic learning. In coal mines of the Donets Coal Basinas, it must be said, in other coal regions, wherecoal is being mined underground, at all times thereis a real hazard of dynamic phenomena in mine ent-ries. First of all a hazard is due to gas-dynamicphenomena — sudden outbursts [Antsiferov et al.,2009]. Generally, sudden outbursts occur after anumber of preliminary stages defined by many fac-tors. Together with man-induced impact on rockmass being mined, geological factor is also involved.One of the main characteristics which define therole of geological factor in occurrence of dynamicphenomena in mine entries is tectonic stresses. Atits core the natural component of the mechanism ofdynamic phenomena in mine entries, in many res-pects, is similar to earthquake-generating me-chanism. The type of dynamic phenomenon is de-termined by properties of rock mass itself. Neo-tec-tonic activity within the limits of one or another ter-ritory plays the determining role in maintenance ofsignificant level of present tectonic stresses. Ac-cordingly one of the urgent problems in researchinto geological causes for occurrence of geodyna-mic phenomena in mine entries is prediction of geo-dynamically active zones. Strictly speaking, ideato investigate zoning of dynamic phenomena withinthe limits of the Donets Coal Basin attracting infor-mation on neo-tectonic activity is not new (G. A. Kon-kov, V. S. Vereda, V. A. Privalov et al.). The authorsof this work also hold the opinion on confinednessof dynamic phenomena in mine entries to dynami-cally active zones of tectonosphere.The objective of this work is to consider the mainmethodical provisions for identification and someoutcomes of prediction of regional zoning of dynamicphenomena in mines of the Donets Coal Basin.The basis for the suggested approach is the equi-librium-state model of the rotated Earth proposedby K. F. Tyapkin and called geoisostasy which isthe subject of considerable literature [Tyapkin, 1980].At present based on the analysis of geoid anoma-lies [Dovbnich, 2008] algorithms are elaborated forcomputation of tectonosphere stress fields causedby disturbance of equilibrium state. In previouslypublished works [Dovbnich, Demianets, 2009] it wasshown that geodynamically active zones of tec-tonosphere manifest themselves in stress anoma-lies due to disturbance of equilibrium state. Firstand foremost, such zones, on the assumption thatstresses acting in them are sufficient, manifest themas seismically active. Elements which are tectonicbase for seismic generating structures are embo-died in stresses under consideration.The working hypothesis in predicting regionalzones for development of dynamic phenomena inmine entries can be the following statement: regionalzones for development of dynamic phenomena aredefined by degree of deformation processes thatdevelop in sedimentation mass, which in their turnare embodied in stress field local component causedby disturbance of equilibrium state.In conditions of the Donets Coal Basin asses-sment of subsurface stressed state caused by dis-turbance of equilibrium state was made on the ba-sis of land gravity measurement data of the scale1: 200,000 and relief digital model.Based on the computed stresses we generatedprediction layout of regional zones for development ofdynamic phenomena for greater territory of the Do-nets Coal basin. A detailed comparison of computedstress fields with gas-dynamic phenomena occurredduring mining of seams m3, l4, l1 and k8 (A. F. ZasyadkoMine) was made (Figure). At the first stage compari-son of gas-dynamic phenomena occurred during mi-ning of seams m3, l4, l1 and k8 with local stressescomputed by land gravity measurement data wasmade. The most of phenomena are confined to the."(,'$&/$-*+"'"'$0 	Comparison layout of gas-dynamic phenomena (A.  F.  Zasyadko Mine) and local geoisostatic stresses (kPa): a — shearstresses, b — compression-tensile stresses (1 — gas-dynamic phenomena, 2 — predicted zones of methane accumulation,3 — tectonic faults).	 1 !"#$%&'!$'(")*"&"'%!%%+",$'(("--&'.anomaly of intense shear stresses. Most zones ofmethane accumulation predicted by a set of indepen-dent techniques are also connected with this anoma-ly. At the second stage for more detailed analysis ofdeformation processes in sedimentation mass withinthe limits of mine field analysis of attitude of coal seamm3 was made. As an outcome we received a layout oflocal folding that complicates close monoclinal bed-ding of this seam and represents difference of the seamsurface and its approximating surface which is poly-nomial of third order. Comparing a layout of local foldswith dynamic phenomena and predicted zones ofmethane accumulation we can insist that majority ofthem is confined to gradient zone of local folds. Thenature of this zone is closely connected with the pro-cesses that are embodied in anomalies of intensity ofReferencesAntsiferov A. V., Golubev A. A., Kanin V. A., Tirkel M. G.,Zadara  G.  Z., Uziyuk  V.  I., Antsiferov  V. A., Suyar-ko  V.  G. Gas content and methane resources ofcoal basins in Ukraine. Vol. 1. — Donetsk: Veber,2009. — 456  p. (in Russian).Dovbnich  M.  M. Disturbance of geoisostasy and tec-tonoshere stressed state // Geophys. J. — 2008.— 30	(in Russian).local shear stresses. Regularities determined withinthe limits of A. F. Zasyadko Mine field confirm as-sumptions on connection of certain components ofstress field caused by disturbance of equilibrium statewith deformation processes developed in sedimenta-tion mass and zones of development of dynamic pro-cesses embodied in it.The authors are convinced that in investigationof dynamic phenomena in geologic environment,independently of their scale — earthquakes, rockbursts, gas-dynamic phenomena and others — themost important element is study of all whole fac-tors, starting from planetary and ending by localones, which result in disturbance of equilibrium stateof the planet and cause occurrence of mechanicalstresses in the outer shells of the Earth.Computer-aided investigation of fault zone deformationresponse to low-amplitude dynamic mechanical actions S. Astafurov, E. Shilko, A. Grigoriev, A. Panchenko, S. Psakhie, 2010Institute of Strength Physics and Materials Sciences, SB RAS, Tomsk, Russiaastaf@ispms.tsc.ruDovbnich M. M., Demianets  S. N.  Tectonoshere stressfields caused by distorsion of geoisostasy andgeodynamics of the Azov-Black Sea region // Geo-phys. J. — 2009. — 31	(inRussian).Tyapkin  K.  F. New rotation hypothesis of structure for-mation and geoisostasy // Geophys. J. — 1980. —2	An important direction in mechanics is investi-gation of features of mechanical response of geolo-gical media. An important feature of geomedium isthat its fragments are in complex stressed state.Relation of internal stresses to strength charac-teristics of interfacial regions (faults and cracks)appreciably defines deformation and relaxation ca-pacity of the mechanism concerned with relativeblock displacement. As the shear stress at an ac-tive block boundary reaches limiting (threshold) va-lue, its local deformation mode can change qualita-tively from slow deformation (creeping) to dynamicdeformation (referred to as unsTable sliding). Notethat according to modern notion, acts of dynamicblock sliding are seismogenerating events thosemagnitude can reach 6—7. Thus, an urgent task ingeomechanics is to develop methods of estimatingthe local stress state at active interfaces of frag-ments of rock massifs or the earth’s crust. Theo-retical studies as well as experiments on pres-tressed rock samples and fragments of plane dis-continuities in rock massifs revealed an importanteffect consisting in deformation response of geo-medium to dynamic perturbations of stress state inform of irreversible relative displacement of blocks.This allowed different authors to formulate the idea

The nature and prediction of regional zoning for dynamic phenomena in mines of the Donets Coal Basin

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The nature and prediction of regional zoning for dynamic phenomena in mines of the Donets Coal Basin

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Наукова електронна бібліотека періодичних видань НАН України (Vernadsky National Library of Ukraine)