Impact of dirt beds in mining structurally complex coal seams

Shubarkol coal deposit is located in the Karaganda Region of the Republic of Kazakhstan. The low ash content of coals governs the increased demand for the powergenerating source among the population. In this connection, it is necessary to produce chinley coal for municipal needs, while production of such coal is only 10 % of the overall coal produced thus far. The complex structural heterogeneity of the coal-bearing rock mass with the presence of many dirt beds of different thickness and dip angles, as well as the existing need to increase the lumpiness of coal for the municipal supply necessitates selective mining of coal blocks. In this situation, it is required to develop drilling and blasting patterns for selective extraction of coal and dirt beds at the preserved content of chinley coal. The studies into drilling and blasting in structurally complex rock mass of the coal mine enabled development of a few approaches to ensuring the required lumpiness of coal due to timely transition between different blasting patterns in excavation panels. The mining technology began to change towards selective extraction as a result. Given depletion of coal reserves over time in mining either coal or other solid minerals, it can be assumed that future technologies will be advanced in the direction of selectivity and greater accuracy of implemented solutions.

Bersenev G. P., Knyazev D. Yu. Impact of dirt beds in mining structurally complex coal seams. MIAB. Mining Inf. Anal. Bull. 2021;(5—2):42—52. [In Russ]. DOI: 10.25018/0236_1493_2021_52_0_42.

The studies are implemented State Contract No. 075-00581-19-00 with the Institute of Mining, Ural Branch, Russian Academy of Sciences, and with attraction of additional funds from economic contract.

Bersenev G. P.¹, Cand. Sci. (Eng.), senior researcher, e-mail: victoria508@mail.ru;
Knyazev D.Yu.¹, Junior researcher, e-mail: knyazev@igduran.ru;
¹ Institute of Mining of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia.

1. Nacional’nym standartom Respubliki Kazahstan «Ugli Shubarkol’skogo mestorozhdeniya [National Standard of the Republic of Kazakhstan «Coals of the Shubarkol deposit]. Ch. 1. Tekhnicheskie usloviya» ST RK 1526—1-2016 (utv. prikazom Predsedatelya Komiteta tekhnicheskogo regulirovaniya i metrologii Ministerstva po investiciyam i razvitiyu Respubliki Kazahstan ot 26.10.2016 no. 270-od). 56 p. [In Russ]

2. Ryzhkov K. M., Lipatnikov S. G., Kudryavcev A. V., Sharko K. S. The necessity and choice of methods for enriching energy coal of the «D» brand in the conditions of LLC «Shakhtoupravlenie» Mayskoe. Ugol’. 2018. no. 7 (1108). pp. 72—77. DOI: 10.18796/0041—5790—2018—7-72—76. [In Russ]

3. Hoyutanov E. A., Batugin S. A., Gavrilov V. L. Reserves for managing natural and technological components of coal ash content in complex-structured deposits. Vestnik Zabajkal’skogo gosudarstvennogo universiteta. 2017. T. 23. no. 8. pp. 83—90. DOI: 10.21209/2227—9245—2017—23—8-83—90. [In Russ]

4. Talanin V. V., Bekher V. G.Justification of the intensity of mining of low-power and complex-structured coal seams of steep fall. MIAB. Mining Inf. Anal. Bull. 2019. no. 6. pp. 88—96. DOI: 10.25018/0236—1493—2019—06—0-88—96. [In Russ]

5. Popov D. V. Methodology for managing the quality of commercial products of coal mines with non-sustained characteristics of the occurrence and quality of coal (on the example of the Bey coal deposit). MIAB. Mining Inf. Anal. Bull. 2020. no. S28. pp. 3—21. DOI: 10.25018/0236—1493—2020—9-28—3-21. [In Russ]

6. Rzhevskij V. V. Otkrytye gornye raboty [Open mining operations]. Moscow: Nedra, 1985. 509 p. [In Russ]

7. Repin N. Ya. Podgotovka i ekskavaciya vskryshnyh porod ugol’nyh razrezov [Preparation and excavation of overburden rocks of coal mines]. Moscow: Nedra, 1978. 256 p. [In Russ]

8. Jeong, H., Jeon, B., Choi, S., Jeon, S. Fracturing behavior around a blasthole in a brittle material under blasting loading. International Journal of Impact Engineering, 2020, Vol. 140. 103562. DOI: 10.1016/j.ijimpeng.2020.103562.

9. Ol’hovatenko V. E. Inzhenerno-geologicheskie usloviya razrabotki otkrytym sposobom Alardinskogo ugol’nogo mestorozhdeniya Kuzbassa i ocenka ustojchivosti bortov kar’era [Engineering-geological conditions of open-pit mining of the Alardinsky coal deposit of Kuzbass and assessment of the stability of the quarry sides]. Tomsk : Izd-vo Tomskogo gosudarstvennogo arhitekturno-stroitel’nogo universiteta, 2015. 88 p. [In Russ]

10. Guo, D., Lv, P., Zhao, J., Zhang, C. Research progress on permeability improvement mechanisms and technologies of coalbed deep-hole cumulative blasting. International Journal of Coal Science and Technology, 2020, Vol. 7, pp. 329—336. DOI: 10.1007/s40789—020— 00320—5.

11. Afanasev, P., Pasynkov, A., Kurta, I. Optimal parameters for drilling explosions when developing coal deposits by open-pit method. E3S Web of Conferences, 2020, Vol. 164, 01012. DOI: 10.1051/e3sconf/202016401012.

12. Sadovskij M. A. Geofizika i fizika vzryva: izbrannye trudy [Geophysics and physics of explosion: selected works]. Otv. red. V. V. Adushkin. Moscow: Nauka, 2004. 440 p. [In Russ]

13. Bersenyov G. P., Shemenyov V. G., Zharikov S. N. Development of science and practice of special blasting operations in the Urals. Gornyj zhurnal. 2012. no. 1. pp. 25—28. [In Russ]

14. Zharikov S. N., Kutuev V. A. Mining shovel energy efficiency and its relationship with the explosive fracture of rocks. IOP Conference Series: Earth and Environmental Science. 2019. Vol. 262 012085. DOI: 10.1088/1755—1315/262/1/012085.

15. Sher E. N., Chernikov A. G. Calculation of the parameters of the radial system of cracks formed during the explosion of an elongated charge in brittle rocks. Fundamental’nye i prikladnye voprosy gornyh nauk. 2015. T. 2. no. 2. pp. 299—303. [In Russ]

16. Yang, L., Wang, Q., Xu, L., Yang, R., Chao, Y. J. Fracture path of cracks emigrating from two circular holes under blasting load. Theoretical and Applied Fracture Mechanics, 2020, Vol. 108, 102559. DOI: 10.1016/j.tafmec.2020.102559.

17. Jeong, H., Jeon, B., Choi, S., Jeon, S. Fracturing behavior around a blasthole in a brittle material under blasting loading. International Journal of Impact Engineering, 2020, Vol. 140, 103562. DOI: 10.1016/j.ijimpeng.2020.103562.

18. Yakovlev V. L. Issledovanie perekhodnyh processov novoe napravlenie v razvitii metodologii kompleksnogo osvoeniya georesursov [Research of transition processes — a new direction in the development of the methodology of integrated development of georesources]. Ekaterinburg: UrO RAN, 2019. 284 p. [In Russ]

19. Hoyutanov E. A., Gavrilov V. L. Increasing the completeness of extraction of reserves of complex-structured layers, taking into account the ash content of coal in the contact zones. Vestnik Zabajkal’skogo gosudarstvennogo universiteta. 2016. T. 22. no. 10. pp. 20—29. DOI: 10.21209/2227—9245—2016—22—10—20—29. [In Russ]