VALIDATION OF GEOTECHNOLOGIC COEFFICIENT OF HYDRODYNAMIC IMPACT ON PRE-STRESSED ROCK MASSIF

Details

Parent Category: Geo-Technical Mechanics, 2014

Category: Geo-Technical Mechanics, 2014, Issue 119

UDC 622.831.322:532.5.013

Author:

Gavrylov V.I., Ph.D. (Tech.), Senior Researcher (IGTM of NAS Ukraine)

Abstract. Unloading of compressed rock massif is impossible without motion of its constituent particles. Motion of rock massif particles and its unloading efficiency are determined (under otherwise equal conditions) by the effective unloading radius R_эф value. Determination of maximum R_эф value shall require meeting the condition of stress balance, i.e. weight of semi-arch rocks must be equal to weight of rocks on support within theunmined ground area per unit of support area. Proceeding from this condition, geotechnologic coefficient value was obtained for calculation of coal seam unloading effective radius at the hydrodynamic impact R_эф=0.798√H, where H is mining depth. The geotechnologic coefficient of hydrodynamic impact on prestressed rock massif k_г.т.=0.798 allows determination of maximum effective radius of the unloaded area subject to wall-rock stability prior to start of hydrodynamic impact on the coal seam mined at the specified depth.

Keywords:

 coal seam, outburst hazard, hydrodynamic impact, unloaded area, effective impact radius.

References:

1. Scientific discovery. The regularity of destruction of gas-porous solid under cyclic hydrodynamic impact. Diploma № 123 (Authors: Sofijskij K.K., Aleksandrov V.G., Baradulin E.G., Muchnik E.I., Vorobyov E.A. // Scientific discoveries: a collection of brief descriptions. - Moscow - St. Petersburg. - 2000 - Edition. 2 - S. 36-38.                                       

About the authors:

Gavrylov Vyacheslav Ivanovych, Candidate of Technical Sciences (Ph.D.), Senior Researcher, Senior Researcher of Department of Undeground Coal Mining Technology, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Ukraine (IGTM NAS of Ukraine), Dniepropetrovsk, Ukraine, е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

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