Strain concentration in wave field generated by blasting in elongated boreholes

With a view to improving the blasting quality control, this article discusses an integrated approach to blast effect analysis. The data of physical tests of composite simulation models in a production environment are compared with the behavior parameters of geo-materials under explosive loads from computer modeling. The computer model is capable of the adequate description of the dynamic strength and failure of geo-medium depending on stresses, type of loading and strain rates. The proposed integrated research procedure allows the comprehensive and most informative estimation of different modes of blasting by studying the patterns and kinetics of strains, and formation of shattering zones as concentration of the latter predetermines breaking and fragmentation of samples. The quality of fragmentation depends on the type of explosives, which is addressed in the article. Furthermore, it is quantitatively shown that the kinetics of time-dependent fragmentation by high explosives, with high energy and detonation velocity cardinally differs from the effect of gentle blasting.

Keywords: explosive, elongated blastholes, fragmentation, physical tests, computer modeling, smoothed particle hydrodynamics.
For citation:

Efremovtsev N. N., Trofimov V.A., Shipovskii I. E. Strain concentration in wave field generated by blasting in elongated boreholes. MIAB. Mining Inf. Anal. Bull. 2020;(8):7385. [In Russ]. DOI: 10.25018/0236-1493-2020-8-0-73-85.

Acknowledgements:

The study was supported by the Russian Foundation for Basic Research, Grant No. 18-05-00912.

Issue number: 8
Year: 2020
Page number: 73-85
ISBN: 0236-1493
UDK: 622.235: 539.3
DOI: 10.25018/0236-1493-2020-8-0-73-85
Article receipt date: 27.02.2020
Date of review receipt: 16.03.2020
Date of the editorial board′s decision on the article′s publishing: 20.07.2020
About authors:

N.N. Efremovtsev1, Cand. Sci. (Eng.), Senior Researcher, e-mail: efremovtsev_n@ipkonran.ru,
V.A. Trofimov1, Dr. Sci. (Eng.), Head of Laboratory, e-mail: trofimov.v@ipkonran.ru,
I.E. Shipovskii1, Cand. Sci. (Eng.), Senior Researcher, e-mail: shipovskiy_i@ipkonran.ru,
1 Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia.

 

For contacts:

I.E. Shipovskii, e-mail: shipovskiy_i@ipkonran.ru.

Bibliography:

1. Andreev S. G., Babkin A. V., Baum F.A. Fizika vzryva. Pod red. L. P. Orlenko. Izd. 3-e. T. 2 [Explosion physics. Orlenko L. P. (Ed.), 3rd edition, vol. 2], Moscow, Fizmatlit, 2004, 656 p.

2. Mott N. F. A theory of the fragmentation of shells and bombs. Fragmentation of rings and shells. Shock wave and high pressure phenomena. Springer, Berlin, Heidelberg. DOI: 10.1007/978-3-540-27145-1_11.

3. Ouchterlony F., Sanchidrian J. A. A review of development of better prediction equations for blast fragmentation. Journal of Rock Mechanics and Geotechnical Engineering. 2019. Vol. 11. No 5. DOI: 10.1016/j.jrmge.2019.03.001.

4. Johnson C. E. Fragmentation analysis in the dynamic stress wave collision regions in bench blasting. 2014. Theses and Dissertations. Mining Engineering, 16, 173 p. https://uknowledge. uky.edu/mng_etds/16.

5. Kukolj I., Oberdorfer B., Ouchterlony F. Internal fractures after blasting confined rock and mortar cylinders. Berg Huettenmaenn Monatsh. 2019. Vol. 164. No 10. Pp. 422—430. DOI: 10.1007/s00501-019-00899-6.

6. Efremovtsev N. N. Methodological questions from the study of the crushing ability of explosives. Vzryvnoe delo. 2015, no 113 (70), pp. 96—106. [In Russ].

7. Efremovtsev N. N., Efremovtsev P. N. The results of the study in production condi-tions of the influence of the kinetics of the release of explosive energy on the crushability of rocks.MIAB. Mining Inf. Anal. Bull. 2015. Special Edition 58, pp. 17—25. [In Russ].

8. Viktorov S. D., Zakalinskiy V. M., Efremovtsev N. N. The use of innovative technolo-gies for controlling the action of an explosion to increase the efficiency of developing deposits of strategic raw materials. Reshenie tekhnologicheskikh problem gornogo proizvodstva na territorii Rossii, blizhnego i dal'nego zarubezh'ya [Solution of technological problems of mining in Russia, at near and far abroad], Moscow, VNIPIpromtekhnologii, 2018, pp. 8—14.

9. Efremovtsev N. N. Aspects of the research into the methods of blast effect cpntrol with the use of compositional simulation models and scientific classification. 9th International Conference on Physical Problems of Rock Destruction. Proceedings. 2017. Pp. 134—139.

10. Shipovskii I. E. Simulation for fracture by smooth particle hydrodynamics code. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2015, issue 1 (145), pp. 76—82. [In Russ].

11. Odintsev V. N., Shipovskii I. E. Simulating explosive effect on gas-dynamic state of outburst-hazardous coal band. Fiziko-tekhnicheskiye problemy razrabotki poleznykh iskopayemykh. 2019, no 4, pp. 46—57. [In Russ]. DOI: 10.15372/FTPRPI20190406.

12. Abdalla M. A. Fragmentation Analysis of OG-7 Warhead Using AUTODYN SPH Solver. Advanced Materials Research. 2012. Vol. 576. Pp. 645—650. DOI: 10.4028/www.scientific.net/ AMR.576.645.

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.