Geomechanics and Engineering

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Model test on slope deformation and failure caused by transition from open-pit to underground mining

  • Zhang, Bin (School of Engineering and Technology, China University of Geosciences (Beijing)) ;
  • Wang, Hanxun (School of Engineering and Technology, China University of Geosciences (Beijing)) ;
  • Huang, Jie (Department of Civil and Environmental Engineering, The University of Texas at San Antonio) ;
  • Xu, Nengxiong (School of Engineering and Technology, China University of Geosciences (Beijing))
  • Received : 2018.10.04
  • Accepted : 2019.09.30
  • Published : 2019.10.10
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Abstract

Open-pit (OP) and underground (UG) mining are usually used to exploit shallow and deep ore deposits, respectively. When mine deposit starts from shallow subsurface and extends to a great depth, sequential use of OP and UG mining is an efficient and economical way to maintain mining productivity. However, a transition from OP to UG mining could induce significant rock movements that cause the slope instability of the open pit. Based on Yanqianshan Iron Mine, which was in the transition from OP to UG mining, a large-scale two-dimensional (2D) model test was built according to the similar theory. Thereafter, the UG mining was carried out to mimic the process of transition from OP to UG mining to disclose the triggered rock movement as well as to assess the associated slope instability. By jointly using three-dimensional (3D) laser scanning, distributed fiber optics, and digital photogrammetry measurement, the deformations, movements and strains of the rock slope during mining were monitored. The obtained data showed that the transition from OP to UG mining led to significant slope movements and deformations that can trigger catastrophic slope failure. The progressive movement of the slope could be divided into three stages: onset of micro-fracture, propagation of tensile cracks, and the overturning and/or sliding of slopes. The failure mode depended on the orientation of structural joints of the rock mass as well as the formation of tension cracks. This study also proved that these non-contact monitoring technologies were valid methods to acquire the interior strain and external deformation with high precision.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Central Universities of China

References

  1. Bae, W. and Woo, K.J. (2007), "A study on the deformation behavior of the segmental grid retaining wall using scaled model tests", Tunn. Undergr. Sp. Technol., 17(5), 350-359.
  2. Bakhtar, K. (1997), "Impact of joints and discontinuities on the blast-response of responding tunnels studied under physical modeling at 1-g", Int. J. Rock Mech. Min. Sci., 34(3-4), 1-15. https://doi.org/10.1016/S1365-1609(97)00143-3.
  3. Bakhtavar, E, Shahriar, K. and Oraee, K. (2009), "Transition from open-pit to underground as a new optimization challenge in mining engineering", J. Min. Sci., 45(5), 485-494. https://doi.org/10.1007/s10913-009-0060-3.
  4. Bakhtavar, E. (2013), "Transition from open-pit to underground in the case of Chah-Gaz Iron Ore combined mining", J. Min. Sci., 49(6), 955-966. https://doi.org/10.1134/S1062739149060166.
  5. Brady, B.H.G. and Brown, E.T. (2006), Rock Mechanics for Underground Mining, Springer.
  6. Bye, A.R. and Bell, F.G. (2001), "Stability assessment and slope design at Sandsloot open pit, South Africa", Int. J. Rock Mech. Min. Sci., 38, 449-466. https://doi.org/10.1016/S1365-1609(01)00014-4.
  7. Chung J., Topal, E. and Ghosh, A. K. (2016), "Where to make the transition from open-pit to underground? using integer programming", J. S. Afr. Inst. Min. Metall., 116(8), 801-808. https://doi.org/10.17159/2411-9717/2016/v116n8a13.
  8. Ding, Z.L., Zhang, L., Chen, Y. and Hu, C.Q. (2011), "3D geomechanical model failure test on stability against deep sliding of gravity dam", J. Hydraul. Eng., 42(4), 499-504 (in Chinese). https://doi.org/10.13243/j.cnki.slxb.2011.04.015.
  9. Fan, Z.J., Kulatilake, P.H.S.W., Peng, J.B., Che, W.Y., Li, Y.Z. and Meng, Z.J. (2016), "In-flight excavation of a loess slope in a centrifuge model test", Geotech. Geol. Eng., 34, 1577-1591. https://doi.org/10.1007/s10706-016-0067-x.
  10. Fumagalli, I.E. (1973a), Linearly-Elastic Static Models, Springer Vienna, Austria, 58-83.
  11. Fumagalli, I.E. (1973b), Model Simulation of Reinforced and Prestressed Concrete Structures, Springer, Vienna, Austria, 84-117.
  12. Fumagalli, I.E. (1973c), Physico-Mechanical Properties to be reproduced in the Model Materials, Springer, Vienna, Austria, 14-32.
  13. Gu, J.C., Gu, L.Y., Chen, A.M., Xu, J. and Chen, W. (2008), "Model test study on mechanism of layered fracture within surrounding rock of tunnels in deep stratum", Chin. J. Rock Mech. Eng., 27(3), 433-438 (in Chinese). https://doi.org/10.3321/j.issn:1000-6915.2008.03.001.
  14. Gu, Q., Ning, J., Tan, Y., Liu, X., Ma, Q. and Xu, Q. (2018), "Damage constitutive model of brittle rock considering the compaction of crack", Geomech. Eng., 15(5), 1081-1089. https://doi.org/10.12989/gae.2018.15.5.1081.
  15. He, M.C., Feng, J.L. and Sun, X.M. (2008), "Stability evaluation and optimal excavated design of rock slope at Antaibao open pit coal mine, China", Int. J. Rock Mech. Min. Sci., 45, 289-302. https://doi.org/10.1016/j.ijrmms.2007.05.007.
  16. Korkmaz, H., Cetin, B., Ege, I., Karatas, A., Bom, A. and Ozsahin E. (2011), "Environmental effects of stone pits in Hatay (Turkey)", Procedia Soc. Behav. Sci., 19, 504-510. https://doi.org/10.1016/j.sbspro.2011.05.162.
  17. Li, S.C., Song, S., Li, L., Zhang, Q. and Wang, K. (2013), "Development on subsea tunnel model test system for solidfluid coupling and its application", Chin. J. Rock Mech. Eng., 32(5), 883-890 (in Chinese). https://doi.org/10.3969/j.issn.1000-6915.2013.05.005.
  18. Li, Z.K., Xu, Q.J., Luo, G.F. and Wang, A.M. (2002), "Three dimensional geomechanical model test of large underground hydropower station group", J. Hydraul. Eng., 31(05), 31-36 (in Chinese). https://doi.org/10.3321/j.issn:0559-9350.2002.05.007.
  19. Lin, P., Liu, X.L., Zhou, W.Y., Wang, R.K. and Wang, S.Y. (2015), "Cracking, stability and slope reinforcement analysis relating to the Jinping dam based on a geomechanical model test", Arab. J. Geosci., 8(7), 4393-4410. https://doi.org/10.1007/ s12517-014-1529-1.
  20. Lu, P., Wu, H.B., Qiao, G. and Li, W.Y. (2015), "Model test study on monitoring dynamic process of slope failure through spatial sensor network", Environ. Earth Sci., 74(4), 3315-3332. https://doi.org/10.1007/s12665-015-4369-8.
  21. Miller, M.B. and Gustin, M.S. (2013), "Testing and modeling the influence of reclamation and control methods for reducing nonpoint mercury emissions associated with industrial open pit gold mines", J. Air Waste Manage. Assoc., 63(6), 681-693. https://doi.org/10.1080/10962247.2013.778221.
  22. Nguyen, P.M.V.N. and Niedbalski, Z. (2016), "Numerical modeling of open pit (OP) to underground (UG) transition in coal mining", Stud. Geotech. Mech., 38(3), 35-48. https://doi.org/10.1515/sgem-2016-0023.
  23. Ordin, A.A. and Vasil'ev, I.V. (2014), "Optimized depth of transition from open pit to underground coal mining", J. Min. Sci., 50(4), 696-706. https://doi.org/10.1134/S1062739114040103.
  24. Rose, N.D. and Hungr, O. (2007), "Forecasting potential rock slope failure in open pit mines using the inverse-velocity method", Int. J. Rock Mech. Min. Sci., 44, 308-320. https://doi.org/ 10.1016/j.ijrmms.2006.07.014.
  25. Shemirani, A. B., Haeri, H., Sarfarazi, V. and Hedayat, A. (2017), "A review paper about experimental investigations on failure behaviour of non-persistent joint", Geomech. Eng., 13(4), 535-570. https://doi.org/10.12989/gae.2017. 13.4.535.
  26. Song, J.Y. and Choi, Y. (2016), "Analysis of the potential for use of floating photovoltaic systems on mine pit lakes: case study at the Sangyong open-pit limestone mine in Korea", Energies, 9(2), 102. https://doi.org/10.3390/en9020102.
  27. Wang, L.P. and Zhang, G. (2014), "Centrifuge model test study on pile reinforcement behavior of cohesive soil slopes under earthquake conditions", Landsides, 11(2), 213-223. https://doi.org/10.1007/s10346-013-0388-2.
  28. Weng, M.C., Lo, C.M., Wu, C.H. and Chuang, T.F. (2015), "Gravitational deformation mechanisms of slate slopes revealed by model tests and discrete element analysis", Eng. Geol., 189, 116-132. https://doi.org/10.1016/j.enggeo.2015.01.024.
  29. Xu, N.X., Zhang, J.Y., Tian, H., Mei, G. and Ge, Q. (2016), "Discrete element modeling of strata and surface movement induced by mining under open-pit final slope", Int. J. Rock Mech. Min. Sci., 88, 61-76. https://doi.org/10.1016/ j.ijrmms.2016.07.006.
  30. Zou, Y.F. and Chai, H.B. (2013), Similar Theory of Mining Subsidence and its Application, Science China Press, Beijing, China (in Chinese).

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