Modelling the influence of gaseous products of explosive detonation on the processes of crack treatment while rock blasting

Viktoriia Kulynych¹, Valerii Chebenko¹, Ruslan Puzyr², Iryna Pieieva¹

¹Kremenchuk Mykhailo Ostrohradskyi National University, Kremenchuk, 39600, Ukraine

²Kremenchuk Mykhailo Ostrohradskyi National University College, Kremenchuk, 39621, Ukraine

Min. miner. depos. 2021, 15(3):102-107

https://doi.org/10.33271/mining15.03.102

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ABSTRACT

Purpose is mathematical modeling of fracturing as well as influence of gaseous products of explosive detonation on the changes in rock strength.

Methods. Mathematical model, using foundations of Griffith theory, has been developed. To explain conditions of bridge formation while exploding lead azide charges, a two-stage description of solid particle condensation at a crack surface and inside it has been applied using the smoothed particle hydrodynamics. The analysis, involved electronic microscope, has helped verified the results experimentally.

Findings. The effect of rock mass disturbance, resulting from explosive destruction, is manifested maximally right after the action. Subsequently, it decreases owing to the gradual relaxation of the formed defects. Therefore, an urgent problem is to develop ways slowing down strength restore of the blasted rock mass fragments. The process of rock fragment strength restoring may be prevented by microparticles getting into the microcrack cavities together with the detonation products. The research simulates their action. The data correlate to the simulation results confirming potential influence of the blasted rock on the dynamics of changes in the strength characteristics of the rock mass. Various compositions of charges with shells made of inert solid additions have been applied which solid particles can avoid the process of microcrack closure.

Originality. For the first time, the possibility of deposition formation within rock micro- and macrocracks has been proposed and supported mathematically.

Practical implications. Strength properties of the finished product and the energy consumption during impulse loading as well as subsequent mechanical processing of nonmetallic building materials depend on the strength properties of rock mass fragments. Hence, the ability to control the strength restore has a great practical value. Moreover, it can be implemented during the blasting operations.

Keywords: deposits, disturbance, labradorite, lead azide, dust, sublimation, smoothed particle hydrodynamics method, microcracks, macrocracks, Griffith theory

REFERENCES

Komir, V., & Nazarenko, V. (1978). The role of gaseous detonation products in the process of destruction of a solid medium. Explosion Case, 80(37), 77-80.
Kuk, M.A. (1980). The science of industrial explosives (pp. 402-407). New York, United States.
Komir, V., Klochko, I., Doludareva, Ya., & Pejeva, I. (2011). The nature of changes in the strength properties of rocks as a result of exposure to explosion of explosive charges. Suchasni Resursoenerhozberihauchi Tehnolohii Hirnychoho Vyrobnytstva, 1(7), 16-21.
Komir, V., Doludarev, V., Doludareva, Ya., Kozlovskaya, T., Komir, A., & Lemizhanskaya, V. (2011) Behavioral features of solid rocks at impulsive impact of industrial explosives charges. Transactions of Kremenchuk Mykhailo Ostrohradskyi National University, 6(71), 123-127.
Doludareva, Ya., Lemizhanska, V., Kozlovska, T., & Komir, A. (2012). The influence of surface-active substances in the region of rock destruction on the intensity of their fragmentation under the action of pulsed loads. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (130), 93-97.
Vorobyov, V., Pomazan, M., Shlyk, S., & Vorobyova, L. (2017). Simulation of dynamic fracture of the borehole bottom taking into consideration stress concentrator. Eastern-European Journal of Enterprise Technologies, 3(1(87)), 53-62. https://doi.org/10.15587/1729-4061.2017.101444
Heim, A.J., Grønbech-Jensen, N., Kober, E.M., Erpenbeck, J.J., & Germann, T.C. (2008). Interaction potential for atomic simulations of conventional high explosives. Physical Review E, 78(4), 046709. https://doi.org/10.1103/physreve.78.046709
Heflinger, D., Bar, I., Ben‐Porat, T., Erez, G., & Rosenwaks, S. (1993). Dynamics of the detonation products of lead azide. II. Formation of charged particles. Journal of Applied Physics, (73), 2138. https://doi.org/10.1063/1.353140
Salenko, Y., Puzyr, R., Shevchenko, O., Kulynych, V., & Pedun, O. (2020). Numerical simulation of local plastic deformations of a cylindrical workpiece of a steel wheel rim. Lecture Notes in Mechanical Engineering, 442-451. https://doi.org/10.1007/978-3-030-50794-7_43
Gorbatyuk, S.M., Shapoval, A.A., Mos’pan, D.V., & Dragobetskii, V.V. (2016). Production of periodic bars by vibrational drawing. Steel in Translation, 46(7), 474-478. https://doi.org/10.3103/s096709121607007x
Markov, O.E., Gerasimenko, O.V., Shapoval, A.A., Abdulov, O.R., & Zhytnikov, R.U. (2019). Computerized simulation of shortened ingots with a controlled crystallization for manufacturing of high-quality forgings. The International Journal of Advanced Manufacturing Technology, 103(5-8), 3057-3065. https://doi.org/10.1007/s00170-019-03749-4
Zhou, M., Liu, S., Du, M., Shi, X., Zhao, Z., Guo, L., & Liu, B. (2020). High-pressure-induced structural and chemical transformations in NaN3. The Journal of Physical Chemistry C, 124(37), 19904-19910. https://doi.org/10.1021/acs.jpcc.0c04107
Schneider, S., Hawkins, T., Rosander, M., Mills, J., Brand, A., Hudgens, L., & Vij, A. (2008). Liquid azide salts. Inorganic Chemistry, 47(9), 3617-3624. https://doi.org/10.1021/ic702068r
Maslov, A., Batsaikhan, J., Puzyr, R., & Salenko, Y. (2018). The determination of the parameters of a vibration machine in the internal compaction of concrete mixtures. International Journal of Engineering & Technology, 7(4,3), 12-19. https://doi.org/10.14419/ijet.v7i4.3.19545
Kholodenko, T., Ustimenko, Y., Pidkamenna, L., & Pavlychenko, A. (2015). Technical, economic and environmental aspects of the use of emulsion explosives by ERA brand in underground and surface mining. New Developments in Mining Engineering 2015, 211-219. https://doi.org/10.1201/b19901-38
Ván, P., Papenfuss, C., & Muschik, W. (2004). Griffith cracks in the mesoscopic microcrack theory. Journal of Physics A: Mathematical and General, 37(20), 5315-5328. https://doi.org/10.1088/0305-4470/37/20/005