Document Type : Original Research Paper
Authors
1 Department of Mining Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Department of Mining Engineering, Tarbiat Modares University, Tehran, Iran
Abstract
Blast damage on the stability of the slopes plays an important role in the profitability and safety of mines. Determination of this damage is also revealed in the widely used Hoek-Brown failure criterion. Of course, this damage is used as a moderating factor in this failure criterion, and its accurate determination is considered an important challenge in rock engineering. This study aims to investigate the effect of geological structures in blast damage factor using 3D discrete element modeling of two slopes with different directions of geological discontinuities. The dynamic pressure of the explosion is also simulated in three blastholes. To ensure the modeling results, other dynamic properties of the model have been selected based on the proven studies. An analytical analysis was conducted based on the failure zones (blast damage area), and quantitative and qualitative analyses were performed using the recorded PPV values during the blasting simulation. The results show that the geological discontinuities control, damp, and reduce blast damage. The expansion of blast damage is reduced by 75% along with the increase in rock mass strength, and the blast damage can expand up to 33 meters along with the decrease in strength. By reducing the distance of discontinuities, the role of discontinuities in damping becomes greater than other properties of the rock mass and the discontinuities further away from the blasting hole create more damping. The relation between the distance from the Hole and PPV values shows that for more realistic slope stability analysis results, the values of the damage factor in the Hoek-Brown failure criterion should be applied gradually and decreasingly in layers parallel to the slope surface.
Keywords
- Geological Discontinuities
- Geological Strength Index
- Peak Particle Velocity
- Blast damage factor
- 3DEC
Main Subjects
- Yang, J., Lu, W., Jiang, Q., Yao, C., Jiang, S., & Tian, L. (2016). A study on the vibration frequency of blasting excavation in highly stressed rock masses. Rock Mechanics and Rock Engineering, 49, 2825-2843.
- Azizabadi, HRM., Mansouri, H., & Fouche, O. (2014). Coupling of two methods, waveform superposition and numerical, to model blast vibration effect on slope stability in jointed rock masses. Computers and Geotechnics, 61, 42-49.
- Ainalis, D., Kaufmann, O., Tshibangu, JP., Verlinden, O., & Kouroussis, G. (2016). Modelling the source of blasting for the numerical simulation of blast-induced ground vibrations: A review. Rock Mechanics and Rock Engineering, 50, 171-193.
- Rezaei, M. (2023). Monitoring the geotechnical stability of quarry rubble mines of the Kurdistan province. Iranian journal of engineering geology, 16(2), 1-18.
- Hoek, E. (2007). Practical rock engineering. Hock`s Corner.
- Hoek, E., & Karzulovic, A. (2000). Rock-mass properties for surface mines. Proceedings Slope Stability in Surface Mining (Edited by W.A. Hustrulid, M.K. McCarter and D.J.A. Van Zyl (Eds)). Society for Mining, Metallurgy and Exploration, Inc. (SME), Colorado, USA.
- Hoek, E., & Brown, ET. (1980). Underground excavations in rock. The Institution of Mining and Metallurgy
- Hoek, E., & Brown, ET. (1988). The Hoek-Brown failure criterion- A 1988 update. Procedure 15th Canadian Rock Mechanics Symposium, Toronto.
- Hoek, E., Wood, D., & Shah, S. (1992). A modified Hoek˗Brown criterion for jointed rock masses. Proceedings of the international ISRM symposium on rock characterization, Chester.
- Eberhardt, E. (2012). The Hoek-Brown failure criterion. International Journal of Rock Mechanics and Rock Engineering, 45, 981-988.
- Zuo, J., & Shen, J. (2020). The Hoek-Brown failure criterion- From theory to application. Springer.
- Hoek, E., Carranza-Torres, C., & Corkum, B. (2002). Hoek-Brown criterion- 2002 edition. Procedure NARMS-TAC Conference, Toronto, 1, 267-273.
- Marinos, P., Marinos, V., & Hoek, E. (2007). Geological strength index (GSI). A characterization tool for assessing engineering properties for rock masses. Lisbon: Underground works under special conditions Taylor and Francis.
- Hoek, E., & Brown, ET. (2019). The Hoek-Brown failure criterion and GSI- 2018 edition. Journal of Rock Mechanics and Geotechnical Engineering, 11, 445-463.
- Sonmez, H., & Ulusay, R. (1999). Modifications to the Geological Strength Index (GSI) and their applicability to stability of slopes. International Journal of Rock Mechanics and Mining Sciences, 36, 743-760.
- Sonmez, H., Gokceoglu, C., & Ulusay, R. (2004). Indirect determination of the modulus of deformation of rock masses based on the GSI system. International Journal of Rock Mechanics and Mining Sciences, 41, 849-857.
- Hoek, E., & Diederichs, MS. (2006). Authors’ reply to the discussion by H. Sonmez and C. Gokceoglu on their paper ‘‘Empirical Estimation of Rock Mass Modulus’’. International Journal of Rock Mechanics and Mining Sciences, 43, 677-678.
- Sonmez, H., & Gokceoglu, C. (2006). Discussion of the paper by E. Hoek and M.S. Diederichs ‘‘Empirical Estimation of Rock Mass Modulus’’. International Journal of Rock Mechanics and Mining Sciences, 43, 671-676.
- Hoek, E. (2012). Blast damage factor D. Technical note for Rocscience.
- Rose, ND., Scholz, M., Burden, J., King, M., Maggs, C., & Havaej, M. (2018). Quantifying transitional rock mass disturbance in open pit slopes related to mining excavation. Slope stability XIV International Congress on Energy and Mineral Resources, Seville, Spain.
- Lu, WB., Hu, YG., Yang, JH., Chen, M., & Yan, P. (2013). Spatial distribution of excavation induced damage zone of high rock slope. International Journal of Rock Mechanics and Mining Sciences, 64,181-191.
- Sheng, S., Qian, Z., Brackley, W., & Li, AJ. (2014). Rock mass disturbance effects on slope assessments using limit equilibrium method. 23rd Australasian conference on the mechanics of structures and materials (ACMSM23), Australia.
- Qian, ZG., Li, AJ., Lyamin, AV., & Wang, CC. (2017). Parametric studies of disturbed rock slope stability based on finite element limit analysis methods. Computers and Geotechnics, 81,155-166.
- Haghnejad, A., Ahangari, K., Moarefvand, P., & Goshtasbi, K. (2018). Numerical investigation of the impact of geological discontinuities on the propagation of ground vibrations. Geomechanics and Engineering 14(6), 545-552.
- Haghnejad, A., Ahangari, K., Moarefvand, P., & Goshtasbi, K. (2019). Numerical investigation of the impact of rock mass properties on propagation of ground vibration. Natural Hazards, 96, 587-606.
- Chamanzad, M.A., & Nikkhah, M. (2020). Sensitivity Analysis of Stress and Cracking in Rock Mass Blasting using Numerical Modelling. Journal of Mining and Environment, 11(4), 1141-1155.
- Afrasiabian, B., Ahangari, K., & Noorzad, A. (2020). Study on the effects of blast damage factor and blast design parameters on the ground vibration using 3D discrete element method. Innovative Infrastructure Solutions, 5(2), 1-4.
- Afrasiabian, B., Ahangari, K., & Noorzad, A. (2021). Study on the effect of air deck on ground vibration and development of blast damage zone using 3D discrete element numerical method. Arabian Journal of Geosciences, 14(1267).
- Kaveh-Ahangaran, D., Ahangari, K., & Eftekhari, M. (2022). Numerical analysis of blast‑induced damage in rock slopes. Innovative Infrastructure Solutions, 7, 1-18.
- Mousavi, SA., Ahangari, K., & Goshtasbi, K. (2022). An Investigation into Bench Health Monitoring under Blast Loading in Hoek-Brown Failure Criterion using the Finite Difference Method. Journal of Mining and Environment, 13(3), 875-889.
- Mousavi, SA., Ahangari, K., & Goshtasbi, K. (2023). Impact of the Layering of Blast-Induced Damage Factors in the Hoek–Brown Failure Criterion on the Bench Damage Monitoring of Mines. Rudarsko-geološko-naftni zbornik, 38(1), 93-104.
- Wyllie, DC., & Mah, C. (2004). Rock slope engineering- Civil and mining. Taylor & Francis, New York, USA.
- Hustrulid, W. (1999). Blasting principles for open pit mining˗ General design concept. Balkema, Rotterdam.
- Rezaei, M., & Seyed-Mousavi, S.Z. (2024). Slope stability analysis of an open pit mine with considering the weathering agent: Field, laboratory and numerical studies. Engineering Geology, 333(107503).
- Hoek, E., & Brown, ET. (1997). Practical estimates of rock mass strength. International journal of rock mechanics and mining sciences, 34(8), 1165-1186.
- Rocscience RocLab. (2007). Tutorial Manual.
- Yilmaz, O., & Unlu, T. (2013). Three dimensional numerical rock damage analysis under blasting load. Tunnelling and Underground Space Technology, 38, 266-278.
- Babanouri, N., Mansouri, H., Karimi-Nasabm, S., & Bahaadini, M. (2013). A coupled method to study blast wave propagation in fractured rock masses and estimate unknown properties. Computers and Geotechnics, 49, 134-142.
- Wei-Hua, W., Xi-Bing, L., Yu-Jun, Z., Zi-Long, Z., & Yi-Ping. Z. (2006). 3DEC modeling on effect of joints and interlayer on wave propagation. Transactions of Nonferrous Metals Society of China, 16, 728-734.
- Mckenzie, CK. (1993). Methods of improving blasting operations. Hudson, I.A., Editor. Comprehensive rock engineering: excavation, support and monitoring, Vol. 4, Pergamon Press, Oxford.
- Jong, Y., Lee, C., Jeon, S., Cho, Y., & Shim, D. (2005). Numerical modeling of the circular-cut using particle flaw code. 31st Annular Conference of Explosives and Blasting Technique, Orlando, USA.
- Aliabadian, Z., & Sharafisafa, M. (2014). Numerical modeling of presplitting controlled method in continuum rock masses. Arabian Journal of Geosciences, 7, 5005-5020.
- Mortazavi, A., & Katsabanis, PD. (2001). Modelling burden size and strata dip effects on the surface blasting process. International Journal of Rock Mechanics and Mining Sciences, 38, 481-498.
- Resende, JRP. (2010). An investigation of stress wave propagation through rock joints and rock masses. D. Thesis, Universidade do Porto, Portugal.
- Drukovanyi, MF., Kravtsov, VS., Chernyavskii, YE., Reva, VV., & Zerkov, SN. (1976). Calculation of fracture zones created by exploding cylindrical charges in ledge rocks. Soviet Mining Science, 12(3), 292-295.
- Liu, Q. (2002). Estimation of dynamic pressure around of fully loaded basthole in rock. Fragblast, 7, 267-272.
- Hustrulid, W., Bennett, R., Ashland, F., & Lenjani, M. (1992). A new method for predicting the extent of blast damage zone. Proc Blasting Conference paper No 3, Gyttorp: Nitro Nobel.
- Persson, PA., Holmberg, R., & Lee, J. (1993). Rock blasting and explosive engineering. CRC Press, London, United Kindom.
- Bhandari, S. (1997). Engineering rock blasting operations. Rotterdam, Balkema.
- Itasca Consulting Group Inc. (2018). 3DEC 5.2 User’s guide. Minneapolis, USA.
- Haghnejad, A., Ahangari, K., & Noorzad, A. (2014). Investigation on various relations between uniaxial compressive strength, elasticity and deformation modulus of Asmari formation in Iran. Arabian Journal for Science and Engineering, 39, 2677-2682.
- Kumar, R., Choudhury, D., & Bhargava, K. (2016). Determination of blast-induced ground vibration equations for rocks using mechanical and geological properties. Journal of Rock Mechanics and Geotechnical Engineering, 8(3), 341-349.
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