Krukovskiy A.P., Krukovskaya V.V., Kocherga V.N. Effect of the gate road supporting method on the methane draining borehole stability

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Parent Category: Geo-Technical Mechanics, 2015

Category: Geo-Technical Mechanics, 2015, Issue 124

 

Geoteh. meh. 2015, 124, 16-31

EFFECT OF THE GATE ROAD SUPPORTING METHOD ON THE METHANE DRAINING BOREHOLE STABILITY

¹Krukovskiy A.P., ¹Krukovskaya V.V., ¹Kocherga V.N.

¹IGTM of the NAS of Ukraine

UDC 622.411.332.023.623:622.83

Abstract. More intensive gas-bearing coal seam mining is accompanied by growing methane emissions into the mine tunnels. To ensure the mine safety by gas leakage at increased coal produc-tion is only possible with high-performance degassing and preserved methane draining boreholes behind the stope.  With the help of numerical simulation methods, the rock mass stress-strain state and methane draining borehole stability were studied depending on the method the gate road were supported. Stress and strain fields and zones with inelastic deformations were defined for the cases when props, scaffolds, timber cribs, two rows of cutting-off supports, pack-timber cribs and wood billets were used. Transverse and longitudinal deformations of the borehole walls are shown in graphs. It is stated that use of the considered methods for the gate road supporting reduces difference between the maximum and minimum stress field components around the tunnel, inelastic deformation zone over the goaf, and wall deformation in the methane draining boreholes. The borehole stability is in-creased by certain per cents when the following facilities are used: timber cribs - by 6 %, timber cribs and two rows of cutting-off support – by 30 %; pack-timber cribs and two rows of cutting-off support – by 43 %; pack-timber cribs, two rows of cutting-off support and wood billets – by 45 %.

Keywords: stress-strain state, computer simulation, gate road, methane draining boreholes.

 

REFERENCES

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About the authors

Krukovskiy Alexander Petrovich, Doctor of Technical Sciences (D. Sc.), Senior Researcher, Deputy Director of the institute, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Krukovskaya Victoriya Victorovna, Doctor of Technical Sciences (D. Sc.), Senior Researcher, Senior Researcher in Department of Control of Dynamic Demonstrations of Rock Pressure, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Kocherga Viktor Nikolaevich, Master of Sciences, Chief Technologist of Department of Pressure Dynamics Control in Rock, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

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