Prykhodchenko O.V., Prykhodchenko S.Yu., Tokar L.O. Determining of integral permeability of undermined coal rock mass in closed mines

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Parent Category: Geo-Technical Mechanics, 2019
Category: Geo-Technical Mechanics, 2019, № 148

Geoteh. meh. 2019, 148, 128-135

https://doi.org/10.1051/e3sconf/201910900075

DETERMININGOF INTEGRAL PERMEABILITY OF UNDERMINED COAL ROCK MASS IN CLOSED MINES

1Prykhodchenko O.V., 1Prykhodchenko S.Yu., 2Tokar L.O.

1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, 2National Technical University Dnipro Polytechnic

UDC [550.382.3:539.217]:622.228                      

Language: English

Abstract. Effect of mining on pressure variation in coal rock mass has been analyzed. Determination of pressure variation within rock mass is an important problem since it will help to identify the residual methane reserves, the rock mass permeability, and parameters of degassing holes. The studies were carried out in the context of series of the holes in the field of Public Joint Stock Company «Mine named after O.F. Zasiadka», which redrilled mined-out seam n1. In the context of each hole, the height of undermining effect was calculated, the dependence of pressure decline relative to a mine working was determined as well as integral permeability; moreover, the hydrogeological data were applied to identify the coefficient of static pressure decline.

Methods to determine the integral permeability as well as fluid pressure variations within undermined coal rock mass have been proposed. The method, intended to measure fluid pressure, is correct for a case when pressure in the neighbourhood of the mined-out seam floor is 0.1 MPa, i.e. during certain period after the coal seam development. With the course of time, migration of fluids takes place towards rock mining within the undermined coal rock mass; in this context, pressure is balanced in the rock mass disturbed by fissures. The pressure variation within the undermined rock mass can also be determined using a method based upon hydrostatic pressure and static pressure determination according to the water levels in a hole if hydrogeological observations during hole drilling involved registration of both static water levels and depths at which measurements were carried out. According to the methods, dependences of pressure variation as well as integral permeability of the undermined coal rock mass were determined in the context of series of holes drilled on the undermined coal rock mass. A technique to identify zones of “fast” gas and “slow” gas within undermined formation has been considered.

Hence, the listed methods help to forecast integral permeability as well as fluid pressure variations within the undermined coal rock mass making it possible to identify zones of “fast” and “slow” gas, and determine parameters to evaluate and extract methane reserves from the undermined coal rock mass.

Keywords: methane, pressure, permeability, coal rock mass.

 

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Abouttheauthors

Prykhodchenko Oleksii Vasylovych, Candidate of Technical Sciences (Ph.D), Researcher in the Department of Geology of Coal Beds at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine(IGTM, NAS of Ukraine), Dnipro, Ukraine,  This email address is being protected from spambots. You need JavaScript enabled to view it.

Prykhodchenko Svitlana Yuriivna,Candidate of Technical Sciences (Ph.D), Senior Researcher, Senior Researcher in the Department of Geology of Coal Beds at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine(IGTM, NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Tokar Larysa Oleksandrivna, Senior Lecturer in Department of Foreign Languages, National Technical University Dnipro Polytechnic (NTU “DP”), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.