Efficiency and seismic safety of constructing underground structures in complex rock masses
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- Category: Content №6 2023
- Last Updated on 23 December 2023
- Published on 30 November -0001
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Authors:
O.K.Ishchenko*, orcid.org/0000-0003-2449-5258, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
O.P.Strilets, orcid.org/0000-0003-2605-9353, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2023, (6): 067 - 072
https://doi.org/10.33271/nvngu/2023-6/067
Abstract:
Purpose. To develop new resource-saving method of underground construction and evaluate how effective it is, to set thresholds for safe seismic ground vibrations which accompany explosions during breaking in mine workings.
Methodology. The work used method of analysing mining and geological conditions of workings, field surveys of rock conditions in face, experiments are conducted on rock samples taken from blasting sites, more detailed data are obtained on rock properties, type and direction of development of crack systems along the workings cross-section by funneling method and approved research methods in accordance with current State Standards.
Findings. Research has been carried out to determine main features of physical and mechanical properties of rocks, fracture and tectonic structure of rock mass and development of fracture systems. According to the results of ejection funnel parameters, the anisotropy coefficient was calculated, and according to data on identification of crack systems and their density, fracture coefficient was calculated. The experimental data obtained were used to adjust rational distances between contour boreholes and along the entire cross-section of working face. Based on corrected drilling and blasting operations (DBO), experimental explosions were carried out in workings. It was established that the borehole utilisation rate (BUR) was 0.95–0.97, uniformity of rock mass crushing was achieved, and explosive material consumption was reduced by 10–15 %. Instrumental measurements of explosion impact in workings proved seismic ground vibrations at protected facilities amounted to 0.4 cm/s with a duration of 0.05 s, which did not exceed the State Standard.
Originality. Optimal DBO parameters are substantiated based on changes in numerical parameters of anisotropy and fracture coefficient, as well as radius of fracture zone along the cross-section of working face. The idea of forming a shielding zone along the contour of workings with explosive charges having an elongated symmetrical cut was confirmed and technically implemented.
Practical value. Laboratory and field research results are fundamental for designing borehole layouts along workings and refer to major initial data used to justify design parameters of blasting chart.
Keywords: blasthole, explosion, blasthole charge, face, rock, fracture
References.
1. Drover, C., & Villaescusa, E. (2019). A comparison of seismic response to conventional and face destress blasting during deep tunnel development. Journal of Rock Mechanics and Geotechnical Engineering, 11(5), 965-978. https://doi.org/10.1016/j.jrmge.2019.07.002.
2. Drover, C., Villaescusa, E., & Onederra, I. (2017). Face destressing blast design for hard rock tunnelling at great depth. Tunnelling and Underground Space Technology, 80, 257-268. https://doi.org/10.1016/j.tust.2018.06.021.
3. Mark, I., & Vlachopoulos, S. (2019). Assessment of strain bursting in deep tunnelling by using the finite-discrete element method. Journal of Rock Mechanics and Geotechnical Engineering, 11(1), 12-37. https://doi.org /10.1016/j.jrmge.2018.06.007.
4. Liu, R., Yang, J., Du, Yu., & Li, M. (2023). Influence of Blasting Disturbance on the Dynamic Stress Distribution and Fracture Area of Rock Tunnels. Journal Applied Sciences, 13(9), 5503. https://doi.org/10.3390/app13095503.
5. Petrenko, V., Bondarenko, N., Miroshnyk, V., Burskyi, M., & Konoval, V. (2022). Substantiating parameters of short-delay blasting and seismic safety while constructing the inclined tunnel. International Symposium on Earth Science and Technology – 2022: IOP Publishing Conference. Series: Earth and Environmental Science, 1156, 012010. https://doi.org/10.1088/1755-1315/1156/1/012010.
6. Simangunsong, G. (2021). Effect of Blasting Geometry and Water on Velocity of Detonation of Heavy ANFO Explosive. International Symposium on Earth Science and Technology, (pp. 102-107). Fukuoka, Japan: Kyushu University. Retrieved from https://www.researchgate.net/publication/369658191.
7. Ischenko, K. S., Zberovskiy, V. V., & Niskevich, A. N. (2012). New approaches to cutting cavity formation. Ugol Ukrainy, (7), 8-14.
8. Kaminskij, A. A., & Kurchakov, E. E. (2018). On the evolution of the pre-fracture zone at the crack tip in a nonlinear anisotropic body. Reports NAN of Ukraine, (10), 44-55. https://doi.org/10.15407/dopovidi 2018.10.044.
9. Kaminskij, A. A., & Kurchakov, E. E. (2019). On the transformation of the boundaries of passive deformation in a nonlinear elastic anisotropic body with a crack. Reports NAN of Ukraine, (9), 20-33. https://doi.org/10.15407/dopovidi2019.09.020.
10. Kim, J. G., & Song, J. J. (2015). Abrasive water jet cutting methods for reducing blast-induced ground vibration in tunnel excavation. International Journal of Rock Mechanics and Mining Sciences, (75), 147-158. https://doi.org/10.1016/j.ijrmms.2014.12.011.
11. Stockwell, M., & Tadic, D. (2010). Blasthole slotting: Reducing over breakage during coal mine blasting. Australian Mining Technology Conference: Technology Changing the Mining Business Footprint. CRC Mining, 47-56. Retrieved from https://espace.library.uq.edu.au/view/UQ:239049.
12. Xie, L. X., Lu, W. B., & Zhang, Q. B. (2017). Analysis of damage mechanisms and optimization of cut blasting design under high in-situ stresses. Tunnelling and Underground Space Technology, (66), 19-33. https://doi.org/10.1016/j.tust.2017.03.009.
13. Jin, X., Liang, J., Fan, X., Chen, L., Wang, Q., Lu, Y., & Wang, K. (2023). A Study on Image Segmentation of Quarry Blast Fragments Based on U-CARFnet. PLoS ONE, 18(9), e0291115. https://doi.org/10.1371/journal.pone.0291115.
14. Mertz, N. H., Palangio, T. K., & Franklin, J. A. (2019). WipFrag Image-based granulometry system. Measurement of blast Fragmentation, 91-99. https://doi.org/10.1201/9780203747919-15.
15. BUDSTANDART (2009). DSTU 4704:2008 Conducting of industrial explosions. Norms of seismic safety. Retrieved from http://online.budstandart.com/ua/catalog/doc-page?id_doc=86092.
16. BUDSTANDART (2010). DSTU 7116:2009: Industrial explosions. Method for determining the actual seismic resistance of buildings and structures. Retrieved from http://online.budstandart.com/ru/catalog/doc-page.html?id_doc=26057.
17. BUDSTANDART (2014). DBN В.1.1-12:2014 Construction in seismic areas of Ukraine. Retrieved from http://online.budstandart.com/ua/catalog/doc-page.html?id_doc=58628.
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