ESTIMATION OF NEAR-WALL ROCK MASS STABILITY WHEN EX-TRACTING EXPOSED COAL SEAM


https://doi.org/10.17073/2500-0632-2018-2-51-57

Full Text:


Abstract

The paper considers assessing stability of the open pit southern wall when extracting exposed coal seam D6. To assess the open pit southern wall stability when extracting exposed coal seams, modern research methods were used: the study of geology and analysis of the near-wall rock mass condition, creation of an observation station and monitoring, estimation of the southern near-wall rock mass stability, and analysis of the study findings. The pit southern wall is composed of clayey sediments up to 5 m thick, underlain by siltstone and mudstone up to 10-20 m thick, and a coal seam up to 5 m thick. Substantiation of the estimated strength characteristics of the rocks composing the open pit bench slopes, which determine the stress state of the slopes, arising under the effect of internal and external forces, has been performed. Instrumental observations produced by the station and the survey of fractures on the open pit wall enabled determining contours of the deformation zone and dimensions of the landslide prism. A geotechnical model of the near-wall rock mass was created, and stability assessment within the geological section along the line of maximum development depth was carried out. After implementing measures on surcharging slopes of the southern wall, the factor of safety amounts to: nу =1.69−1.73 that indicates termination of the active phase of the wall deformation and confirms the wall stability.


About the Authors

Olga G. Bessimbaeva
Karaganda State Technical University
Kazakhstan

56, Mira blvd, Karaganda city, The Republic of Kazakhstan, 100027

Cand. Sci. (Tech.)



Elena N. Khmyrova
Karaganda State Technical University
Kazakhstan

56, Mira blvd, Karaganda city, The Republic of Kazakhstan, 100027

Cand. Sci. (Tech.)



Farit K. Nizametdinov
Karaganda State Technical University
Kazakhstan

56, Mira blvd, Karaganda city, The Republic of Kazakhstan, 100027

Dr. Sci. (Tech.) (7212) 56-26-27



Elena A. Oleinikova
Karaganda State Technical University
Kazakhstan

56, Mira blvd, Karaganda city, The Republic of Kazakhstan, 100027

(7212) 56-26-27



References

1. Metodicheskie ukazaniya po opredeleniyu uglov naklona bortov, otkosov ustupov i otvalov stroyashihsya i ekspluatiruemyh karerov [Methodical instructions for determining the angles of inclination of the sides, slopes of ledges and dumps of the quarries being built and operated]. Leningrad, VNIMI, 1972, 165 p.

2. Vremennye metodicheskie ukazaniya po upravleniyu ustojchivostyu bortov karerov cvetnoj metallurgii [Temporary methodological instructions for managing the stability of the sides of quarries of non-ferrous metallurgy]. Moscow, Giproruda, 1989, 128 p.

3. Pravila obespecheniya ustojchivosti otkosov na ugolnyh razrezah [Rules for ensuring the stability of slopes on coal mines]. St. Petersburg, VNIMI, 1998, 208 p.

4. Metodicheskie ukazaniya po nablyudeniyam za deformaciyami bortov, otkosov ustupov i otvalov na karerah i razrabotke meropriyatij po obespecheniyu ih ustojchivosti [Methodological guidelines on observations of deformations of the sides, slopes of ledges and dumps in quarries and the development of measures to ensure their stability]. Agreed by the order of the Committee for State Control over Emergencies and Industrial Safety of the Republic of Kazakhstan dated September 22, 2008. No. 39.

5. Metodicheskie ukazaniya po nablyudeniyam za deformaciyami bortov, otkosov ustupov i otvalov na karerah i razrabotke meropriyatij po obespecheniyu ih ustojchivosti [Methodological guidelines on observations of deformations of sides, slopes of ledges and dumps in quarries and development of measures to ensure their stability]. Leningrad, VNIMI, 1971, 188 p.

6. Fisenko G.L. Ustojchivost bortov karerov i otvalov [Stability of the sides of quarries and dumps]. Moscow, Nedra, 1965, 378 p.

7. Dolgonosov V.N., Shpakov P.S., Nizametdinov F.K., et al. Analiticheskie sposoby rascheta ustojchivosti karernyh otkosov: Monografiya [Analytical ways of calculating the stability of career slopes: Monograph]. Karaganda, "Sonata"-Poligrafiya, 2009, 339 p.

8. Baklashov I.V. Deformirovanie i razrushenie porodnyh massivov [Deformation and destruction of rock massifs]. Moscow, Nedra, 1988, 271 p.

9. Pevzner M.E. Borba s deformaciyami gornyh porod na karerah [Fighting deformations of rocks in quarrie]. Moscow, 1978, 255 p.

10. Popov I.I., Okatov R.P. Borba s opolznyami na karerah [Fighting landslides in quarries]. Moscow, Nedra, 1980, 239 p.

11. Popov I.I., Nizametdinov F.K., Okatov R.P., et al. Prirodnye i tehnogennye osnovy upravleniya ustojchivostyu ustupov i bortov karera [Natural and technogenic foundations for managing the stability of ledges and pit edges] Almaty, Gylym, 1997, 215 p.

12. Ozhigin S.G., Ozhigina S.B., Shpakov P.S., et al. Svidetelstvo o gosudarstvennoj registracii prav na obekt avtorskogo prava №126 ot 26 yanvarya 2015 goda "Ustojchivost karernyh otkosov" (programma dlya EVM) [Certificate of state registration of rights to the object of copyright No. 126 dated January 26, 2015 "Sustainability of career slopes" (computer program)].

13. Scott M., Mazumder S., Jiang J. Permeability Increase in Bowen Basin Coal as a Result of Matrix Shrinkage during Primary Depletion. SPE Int. SPE 158152, 2012, vol. 1, pp. 323–343.

14. Pan Z., Connell L.D. Modeling Permeability for Coal Reservoirs: A Review of Analytical Models and Testing Data. Int. J. Coal Geol., 2012, 92, pp. 1–44.

15. Nazarova L.A., Nazarov L.A., Karchesvky A.L., Vandamme M. Determining Kinetic Parameters of a Block Coal Bed Gas by Solving Inverse Problem Based on Data of Borehole Gas Measurements. J. Min. Sci., 2015, vol. 51, no. 4, pp. 666–672.

16. Pinkun Guo, Yuanping Cheng. Permeability Prediction in Deep Coal Seam: A Case Study on No. 3 Coal Seam of the Southern Qinshui Basin in China. The Scientific World Journal, 2013, vol. 2013.

17. Seidle J., Jeansonne M., Erickson D. Application of Matchstick Geometry to Stress Dependent Permeability in Coals. SPE Rocky Mountain Regional Meeting, Society of Petroleum Engineers, 1992.


Supplementary files

For citation: Bessimbaeva O.G., Khmyrova E.N., Nizametdinov F.K., Oleinikova E.A. ESTIMATION OF NEAR-WALL ROCK MASS STABILITY WHEN EX-TRACTING EXPOSED COAL SEAM. Gornye nauki i tekhnologii = Mining Science and Technology (Russia). 2018;(2):51-59. https://doi.org/10.17073/2500-0632-2018-2-51-57

Views: 175

Refbacks

  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.


ISSN 2500-0632 (Online)