HOW HEIGHT OF THE WATERED COAL BEDDING IMPACTS ON THE MINE TUNNEL STABILITY

Details

Parent Category: Geo-Technical Mechanics, 2015

Category: Geo-Technical Mechanics, 2015, Issue 123

UDC 622.831.332:551.24

Authors:

Molchanov A.N., D. Sc. (Tech.), (IPMP of the NAS of Ukraine)

Vinogradov Y.A.,  M.S. (Tech.), (IPMP of the NAS of Ukraine)

Abstract.

TheWestern Donbass area refers to one of the most complicated geological conditions. Due to the watering, the enclosing rocks are got soaked, mine tunnel contour losses its stability, and marginal rocks fall.

A computer simulation was used for studying changes in the stress field and permeability around the mine tunnels with the frame supports and roof bolting when a flooded coal brat was located in the roof. A series of numerical experiments were carried out with different distances between the mine roof and watered coal brat. Distributions of the estimated values of geomechanical parameters and zones with inelastic deformations around the mine tunnel are shown for the cases under the consideration. The values of the rocks filtration permeability in the mine roofs are compared for the cases with frame supports and roof bolting. It is shown that when the roof bolting is used, difference between the maximum and minimum stress field components decreases by 25-30% and permeability in the mine roof decreases by 25-35%. The roof bolting prevents fractures around the mine tunnel from further development, retains enclosing rocks in their natural, solid state, and increases the tunnel stability even when a watered coal brat is located in its roof.

Keywords:

water inflow into the mine tunnel, numerical methods, roof bolting.

References:

1. Krukovskaya, V.V., Krukovskiy, A.P. and Vinogradov, Yu.A. (2015), “Study water inflow in mines with anchors”, Geotekhnicheskaya Mekhanika [Geo-Technical Mechanics], no. 120, pp. 182-193.

2. Baklashov, I. V. and Kartoziya, B. A. (1984), Mekhanika podzemnykh sooruzheniy i konstruktsiy krepey [Mechanics of underground structures and structures of supports], Nedra, Moscow, USSR.

3. Krukovskiy, A.P. (2010), “The stress-deformed state of rock in the neighborhood of the mine working fixed by simple constructions of the roof bolting”, ”, Geotekhnicheskaya Mekhanika [Geo-Technical Mechanics], no. 89, pp. 99-109.

4. Krukovskiy, A.P. (2011), “Modelling changes of stress-strain state of solid edge during the distance of working face of mine workings”, Problemy obchyslyuvalnoyi mekhaniky i mitsnosti konstruktsiy, vol.17, pp. 175-181. 

5. Fadeev, A. B. (1987), Metod konechnykh elementov v geomekhanike [The finite element method in geomechanics], Nedra, Moscow, USSR.

6. Zenkevich, O. (1975), Metod konechnykh elementov v tekhnike [A finite element method in the engineering], Mir, Moscow, USSR.

7. Vinogradov, Yu.A. (2015), “The change of the rock massif stress state in the working face during drilling and blasting operations”, Suchasni resursoenergozberigayuchi tekhnologii girnychogo vyrobnytstva, no. 1(15), pp. 89-95.

8. Krukovska, V.V. (2006), “Preparation method of calculation of methane filtration parameters with the account a mode of stressedly-deformed state of coal-rock mass”, Abstract of Ph.D. dissertation, Geotechnical and mining mechanical, IGTM, Dnepropetrovsk, Ukraine.

9. Vinogradov, V.V. (1989), Geomekhanika upravleniya sostoyaniem massiva vblizi gornykh vyrabotok [Geomechanics of the massif state control near the mine workings], Naukova dumka, Kiev, USSR.

 

About the authors:

Molchanov Aleksandr Nikolaevich, Doctor of Technical Sciences (D. Sc), Deputy Director of the institute, Institute for Physics of mining processes (IPMP NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Vinogradov Yuriy Alekseevich, Master of Sciences, engineer, Institute for Physics of mining processes (IPMP NAS of Ukraine), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

• < Prev
• Next >