Bulat A.F., Slashchev I.N. The use of radon decay products as informative parameters for evaluation of the rocks geomechanical condition

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Parent Category: Geo-Technical Mechanics, 2017

Category: Geo-Technical Mechanics, 2017, Issue 132

 

Geoteh. meh. 2017, 132, 3-16

THE USE OF RADON DECAY PRODUCTSAS INFORMATIVE PARAMETERS FOR EVALUATIONOF THE ROCKS GEOMECHANICAL CONDITION

¹Bulat A.F., ¹Slashchev I.N.

¹IGTM NAS of Ukraine

UDC 622.831.312 : 622.817

Abstract. The article presents results of investigations of radon-enriched air (or methane-air) mixture escaping from the solid rocks into the mine working atmosphere. It is shown that parameters of changes of alpha-radiation intensity in some radon isotopes, methane concentrations and their proportion can be used for predicting geomechanical and dynamic processes in the rock massif by differentiated-in-time changes of stress-strain state of the rocks and porous-fractured space around the mine workings in the process of mining operations. Such changes of alpharadiation intensity are explained by natural decay of radon isotopes, emissions of radon-decay daughter products and methane transported over time from sources of their formation into the mine workings because, firstly, changes of the Po218 isotope concentrations with taking into account its decay time depend on change of the rock fracturing in the marginal area of the mine working. And, secondly, changes of deviations from the average concentration of radon decay daughter products depend on transformations of porous-fractured space volume occurred in the process of mining operations. Under certain parameters of diffusion and filtration, it makes possible to predict changes of geomechanical conditions not only in the marginal areas but also in remote rocks far from the mine workings.

Keywords: radon decay products, geomechanical processes, permeability, filtering, modeling of the rock massif, prediction of geomechanical condition.

 

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About the authors

Bulat Anatoly Fedorovich, Academician of the National Academy of Sciences of Ukraine, Doctor of Technical Sciences (D. Sc), Professor, Director of the Institute, 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. .

Slashchev Igor Nikolaevich, Candidate of Technical Sciences (Ph.D.), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, 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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