Polyakov Yu.Е., Usov O.A. Factors of influence of coal hydraulic treatment on unlouding of the face area in the rocks

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Parent Category: Geo-Technical Mechanics, 2016

Category: Geo-Technical Mechanics, 2016, Issue 129

Geoteh. meh. 2016, 129, 166-172

FACTORS OF INFLUENCE OF COAL HYDRAULIC TREATMENT ON UNLOUDING OF THE FACE AREA IN THE ROCKS

¹Polyakov Yu.Е., ¹Usov O.A.

¹IGTM NAS of Ukraine

Abstract. This article analyzes correspondence between practical observations and generally accepted conception on the seam unloading during the hydraulic breaking through the crack propa-gation caused by the water pressure (water-power unloading). By considering the existing materials from this point of view, we face a problem of crack formation with a large irreversible opening un-der discharge pressures, which are less than minimum component of the rock pressure. This fact cannot be explained by existing conception on crack propagation. So, we can reasonably assume that reason of the rock unloading due to the surrounding rock pressure during the hydraulic break-ing is not the crack propagation under discharge pressure, and that other effects may exist which could be associated with liquid penetration into the rocks. The article presents a model of unloading of ultimately stressed coal seam at which crack formation does not depend on water pressure and depends on rock pressure which exceeds ultimate strength of the wetted coal. The effect of the seal-ing depth and length of the filter portion of borehole are considered, which radically change result of the hydraulic treatment. On the basis of practical observations, it is stated that sealing depth has greater influence on the process than length of filter portion of the borehole.

Keywords: hydraulic power, contact friction, hydraulic treatment, ultimate strength, hydraulic breaking.

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About the authors:

Polyakov Yuriy Evgenevich, Master of Sciences, Junior Researcher in Department of Rock Breaking Problems, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Usov Oleg Aleksadrovich, Candidate of Technical Sciences (Ph.D.), Senior Researcher in Department of  Rock Breaking Problems, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

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