Method to make a shielding slot in pit wall rock mass using non-explosive destructive mixture

Conventional blasting technologies cause disintegration, fracturing and weakening of pit wall rock mass. The use of lower explosive agents, relay detonators and special charge designs abates the impact on the pit wall rock mass but increases expenses connected with breakage and sometimes fails to ensure wanted results. It is recommended to perform drilling and blasting in pit wall rock mass using novel non-explosive destructive mixture placed in pre-drilled boreholes, which preserves natural integrity of rocks, minimizes cleavage, reduces risk of falls-off and increases pit slope stability. This article describes a new method of wall control blasting in adjacent rock mass around an open pit using the non-explosive destructive mixture. The lab-scale tests prove the new-composition non-explosive destructive mixture provides high-quality wall control blasting up/down a bench, reduces labor input of drilling and blasting, ensures eco-friendliness, increases safety as well as cuts down cost and energy of mining.The theoretical investigation into the process of making a slot in pit wall rock mass has determined effective spacing of the perimeter holes with non-explosive destructive mixture. The laboratory studies show that the new method and mixture create high interior pressure in holes, which contributes to static disintegration and fracture of rocks.

Keywords: wall control blasting, shielding slot, non-explosive destructive mixture, perimeter holes, design, effective spacing of perimeter holes, fracturing initiation.
For citation:

Nasirov U. F., Zairov Sh. Sh., Ochilov Sh. A., Ravshanova M. Kh., Ergashev O. S. Method to make a shielding slot in pit wall rock mass using non-explosive destructive mixture. MIAB. Mining Inf. Anal. Bull. 2021;(3):72-82. [In Russ]. DOI: 10.25018/0236-1493-2021-3-072-82.

Acknowledgements:
Issue number: 3
Year: 2021
Page number: 72-82
ISBN: 0236-1493
UDK: 622.063.23:622.271.332
DOI: 10.25018/0236-1493-2021-3-0-72-82
Article receipt date: 17.03.2020
Date of review receipt: 08.10.2020
Date of the editorial board′s decision on the article′s publishing: 10.02.2021
About authors:

U.F. Nasirov, Dr. Sci. (Eng.), Professor, Deputy Director, Almalyk branch of National University of Science and Technology «MISiS», 110100, Almalyk, Uzbekistan, e-mail: unasirov@yandex.ru,
Sh.Sh. Zairov1, Dr. Sci. (Eng.), Professor, e-mail: sher-z@mail.ru,
Sh.A. Ochilov2, PhD., Associate Professor, e-mail: o.shuhrat84@yandex.ru,
M.Kh. Ravshanova1, Senior Lecturer, e-mail: m.ravshanova@inbox.uz,
O.S. Ergashev2, Master’s Degree Student,
1 Navoi State Mining Institute, 210100, Navoiy, Uzbekistan,
2 Islam Karimov Tashkent State Technical University, 100095, Tashkent, Uzbekistan.

 

For contacts:

U.F. Nasirov, e-mail: unasirov@yandex.ru.

Bibliography:

1. Rumyantsev A. E., Paramonov G. P., Kovalevskiy V. N. Effect of blasthole charge design and properties of an explosive on quality of a perimeter hole. MIAB. Mining Inf. Anal. Bull. 2013, no 5, pp. 309—313. [In Russ].

2. Sakhno I. G., Borshchevskiy S. V., Shulyak Ya. O. New non-explosive destructive mixture for rock fracture under conditions of temperature fields in underground excavations. Vіsnik KrNU іmenі Mikhayla Ostrograds'kogo. 2012, no 1 (72), part 1, pp. 116—120.

3. Sharov K. V. Obosnovanie parametrov ekologicheski chistogo napravlennogo nevzryvnogo metoda razrusheniya porod na osnove rasshiryayushcheysya tsementnoy smesi pri razrabotke gipsovykh mestorozhdeniy [Substantiation of eco-friendly directional non-explosive destruction method for rocks based on expandable cement mixture in gypsum production], Candidate’s thesis, Moscow, 2001, 16 p.

4. Mikhaylova T. V., Bakhaeva S. P. Optimization of pit wall design based on zoning of coal seam occurrence conditions. Mine Surveying Bulletin. 2002, no 3, pp. 47—50. [In Russ].

5. Norov Yu. D., Nasirov U. F., Zairov Sh. Sh. Determination of ground compaction depth in borehole charge blasting. MIAB. Mining Inf. Anal. Bull. 2010, no 6, pp. 271—273. [In Russ].

6. Norov Yu. D., Zairov Sh. Sh. Experimental investigation of blasting impact in case of charge concentration in shortened holes. MIAB. Mining Inf. Anal. Bull. 2010, no 7, pp. 205—210. [In Russ].

7. Norov Yu. D., Nasirov U. F., Zairov Sh. Sh., Ivanovskiy D. S. Theoretical studies into action patterns of a cylindrical charge in different strength rocks in stratified deposits. MIAB. Mining Inf. Anal. Bull. 2010, no 4, pp. 140—142. [In Russ].

8. Ahmed R. Comportement et fragmentation dynamique des matérieaux quasi fragiles. Application à la fragmentation des roches par explosifs; Thèse de Doctorat de l'Ecole Nationale Supérieure des Mines de Paris; 2004. 210 p.

9. Peter B. Optimisation of fragmentation and comminution at boliden mineral, Aitik Operation, 2005. 179 р.

10. Paine R. S., Holmes D. K., Clark H. E. Presplit blasting at the Niagara power project. The Explosives Engineer. 2003. Vol. 39. No 3. Pр. 72—92.

11. Rossmanith H. P. The mechanics and physics of advanced blasting-waves, shocks, fracture, damage, impact and profit. Short Course Frag Blast. 2006. 214 р.

12. Rustan A. Spacing and borehole diameter at rock blasting. 3rd International Symposium on Rock Frequentation by Blasting, Brisbane. 1990. pp 303—310,

13. Selberg H. L. Transient compression waves from spherical and cylindrical cavities. Archive for physics, Band 5. 1995. No 7. Pр. 307—314.

14. Neganov V. P. Analysis of destructive effect of explosions beyond the fragmentation perimeter. Tsvetnaya metallurgiya. 1999, no 19, pp. 13—16.

15. Kutuzov B. N., Shifrin V. I. Perimeter control blasting pattern selection for very hard overburden in face stone quarries. Fiziko-tekhnicheskiye problemy razrabotki poleznykh iskopayemykh. 2007, no 6, pp. 56—62.

16. Baron L. I., Klyuchnikov A. V. Konturnoe vzryvanie pri prokhodke vyrabotok [Perimeter control blasting in heading in underground mines], Saint-Petersburg, 1997, 204 p.

17. Silaev A. A., Kuznetsov V.A. Perimeter control blasting in construction.Gornyi Zhurnal. 2000, no 3, pp. 37—40.

18. Borovikov V.A. Some theoretical aspects of preliminary slot making. Fizicheskie protsessy gornogo proizvodstva. Mezhvuzovskiy sbornik. Vyp. 2 [Physical processes in mining. Interdepartmental collection of papers. Issue 2], Saint-Petersburg, 2005, pp. 69—73.

19. Neganov V. P., Skripka V.A. Efficient blast designs for wall control blasting. Tsvetnaya metallurgiya. 1991, no 23, pp. 10—12.

20. Baranov E. G., Mosinets V. N. Blasting with preliminary delineation of rock mass to be fractured. Gornyi Zhurnal. 1994, no 7.

21. Drukovanyy M. F., Efremov E. I. Application range of high bench blasting and rock facture mechanism. Gornyi Zhurnal. 1990, no 11, pp. 39—41.

22. Sakhno I. G. Nauchnye osnovy upravleniya sostoyaniem gornykh porod nevzryvchatymi razrushayushchimi smesyami pri podzemnoy razrabotke mestorozhdeniy [Scientific framework for rock mass quality control using non-explosive destructive mixtures in underground mining], Doctor’s thesis, Krasnoarmeysk, 2015, 457 p.

23. Bek A. SH., Kasymkanova Kh.-K.M., Nurpeisova M. B. Patent of the Republic of Kazakhstan No 14023. 16.02.2004.

24. Borovkov Yu.A., Sharov K. V. Substantiation of directional non-explosive destructive fracture of rocks using expandable cement mixture. Journal of Mining Institute. 2001, vol. 149, pp. 251—254.

25. Baklashov I. V., Goncharov S. A., Davidenko B. Yu., Morit R. E. Izyskanie novykh sposobov zaotkoski i ukrepleniya konturnykh ustupov Olenegorskogo kar'era. Nauchnyy otchet [Finding new methods for wall control blasting and reinforcement in Olenegorsk open pit mine. Research report], Moscow, 1991, 84 p. [In Russ].

Подписка на рассылку

Раз в месяц Вы будете получать информацию о новом номере журнала, новых книгах издательства, а также о конференциях, форумах и других профессиональных мероприятиях.