Surface mines composite slope deformation mechanisms and stress distribution

Yamah J. Barvor¹, Sher Bacha^1,2, Cai Qingxiang¹, Mohammad Siddique²

¹School of Mines, China University of Mining and Technology, Xuzhou, 221116, China

²Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, 87300, Pakistan

Min. miner. depos. 2020, 14(4):1-16

https://doi.org/10.33271/mining14.04.001

Full text (PDF)

      ABSTRACT

      Purpose. To analyze surface mines composite slope deformation mechanisms and stress distribution.

      Methods. Description and interpretations of the mechanical and stress computational model for a waste dump loading in the formation of a composite slope on the basis of the theory of plasticity and elasticity. Numerical and analytical simulations for composite slope stress distribution.

      Findings. From the numerical and analytical simulations, it is found that the increase in slope height and angle results in an increase in stress within the geo stress field of a composite slope. The numerical simulation also shows that as the dump is moved away from the point of application the settlement induced by the dump is larger beneath the dump and decreases away from the dump, hence the stress reduces. This highlights the sensitivity in simulating the effect of the waste dump at different position within the computation analysis of a composite slope stability problem. Furthermore, it is obtained that the stress induced by a trapezoidal loading is lesser than that of a rectangular loading, which is obvious. Finally, this paper provides the stress influence rule due to excavation in a surface mining operation. The stresses due to the dump loading were obtained and compared to stresses obtained from finite element analysis and both results are well in agreement.

      Originality.The paper provides novel approach for the mechanisms of composite slope stress distribution and deformation mechanisms.

      Practical implications. The results effectively describe the stress distribution mechanisms and stability analysis of composite slopes and provides basis for the preliminary design and stability of composite slopes.

      Keywords: composite slope; deformation mechanism, waste dump, theory of plasticity

      REFERENCES

1. Roy, S., & Mandal, N. (2009). Modes of hill-slope failure under overburden loads: Insights from physical and numerical models. Tectonophysics, 473(3-4), 324-340.https://doi.org/10.1016/j.tecto.2009.03.005
2. Bonilla-Sierra, V., Elmouttie, M., Donzé, F.-V., & Scholtès, L. (2017). Composite wedge failure using photogrammetric measurements and DFN-DEM modelling. Journal of Rock Mechanics and Geotechnical Engineering, 9(1), 41-53.https://doi.org/10.1016/j.jrmge.2016.08.005
3. Nunoo, S. (2018). Lessons learnt from open pit wall instabilities: case studies of BC open pit hard rock mines. Journal of Mining Science, 54(5), 804-812.https://doi.org/10.1134/s1062739118054915
4. Shruthi, B., Rajurkar, V.J., & Geete, S.S. (2019). Stability analysis of dump slope in open cast mines. HELIX, 9(6), 5706-5710.https://doi.org/10.29042/2019-5706-5710
5. Hudson, J.A., & Harrison, J.P. (1997). Engineering rock mechanics. Oxford, United Kingdom: Pergamonhttps://doi.org/10.1016/b978-008043864-1/50002-1
6. Azizi, M.A., Karim, R., Marwanza, I., & Ghifari, M.K. (2019). Prediction of material volume of slope failure in nickel surface mine using limit equilibrium method 3D. Indonesian Mining Professionals Journal, 1(1), 43-48.https://doi.org/10.36986/impj.v1i1.13
7. Upadhyay, O.P., Sharma, D.K., & Singh, D.P. (1990). Factors affecting stability of waste dumps in mines. International Journal of Surface Mining, Reclamation and Environment, 4(3), 95-99.https://doi.org/10.1080/09208119008944174
8. Nian, T.-K., Huang, R.-Q., Wan, S.-S., & Chen, G.-Q. (2012). Three-dimensional strength-reduction finite element analysis of slopes: geometric effects. Canadian Geotechnical Journal, 49(5), 574-588.https://doi.org/10.1139/t2012-014
9. Zajączkowski, M., Kasztelewicz, Z., & Sikora, M. (2014). Method for location of an external dump in surface mining using the a-star algorithm. Archives of Mining Sciences, 59(3), 721-730.https://doi.org/10.2478/amsc-2014-0050
10. Ranjan, V., Sen, P., Kumar, D., & Saraswat, A. (2016). Enhancement of mechanical stability of waste dump slope through establishing vegetation in a surface iron ore mine. Environmental Earth Sciences, 76(1).https://doi.org/10.1007/s12665-016-6350-6
11. Singh, A.P., & Singh, T.N. (2006) Assessing instability of coal mine waste dump. The Indian Mineral Industry Journal, 113-118.
12. Steiakakis, E., Kavouridis, K., & Monopolis, D. (2009). Large scale failure of the external waste dump at the “South Field” lignite mine, Northern Greece. Engineering Geology, 104(3-4), 269-279.https://doi.org/10.1016/j.enggeo.2008.11.008
13. Jiang, H.B., Hu, T., Li, S.C., & Li, J. (2011). Dump slope stability analysis and landslide forecast research. Applied Mechanics and Materials, (71-78), 4642-4644.https://doi.org/10.4028/www.scientific.net/amm.71-78.4642
14. Singh, T.N., & Chaulya, S.K. (1992). External dumping of overburden in opencast mine. Indian Journal of Engineers, 22(1 & 2), 65-73.
15. Singh, T.N., Singh, A.P., & Goyal, M. (1994). Stability of waste dump and its relation to environment. Indian Journal of Cement Review, 9(2), 15-21.
16. Landva, A., & Knowles, G.D. (1990). Geotechnics of waste fills: theory and practice. Philadelphia, United States: ASTM.
17. Ugai, K. (1989). A method of calculation of total safety factor of slope by elasto-plastic FEM. Soils and Foundations, 29(2), 190-195.https://doi.org/10.3208/sandf1972.29.2_190
18. Chaney, R., Demars, K., Pelkey, S., Valsangkar, A., & Landva, A. (2001). Shear displacement dependent strength of municipal solid waste and its major constituent. Geotechnical Testing Journal, 24(4), 381.https://doi.org/10.1520/gtj11135j
19. McCarter, M.K. (1990). Design and operating considerations for mine waste embankments. In Surface Mining (pp. 890-899). Littleton, United States: Society for Mining, Metallurgy and Exploration.
20. Campbell, D.B. (1992). Resloping of waste rock dumps. International Mine Waste Management News, 2(2), 7-10.
21. Kocasoy, G., & Curi, K. (1995). The ümraniye-hekimbaşi open dump accident. Waste Management & Research, 13(4), 305-314.https://doi.org/10.1177/0734242x9501300402
22. Blight, G. (2008). Slope failures in municipal solid waste dumps and landfills: a review. Waste Management & Research, 26(5), 448-463.https://doi.org/10.1177/0734242x07087975
23. Huang, M., & Li, X. (2007). Analysis of stability of waste-dump slope of a mine. Athens, Greece: School of Mining and Metallurgical Engineering.
24. Huvaj-Sarihan, N., & Stark, T.D. (2008). Back analyses of landfill slope failures. Proceedings of 6th International Case Histories Conference, 11-16.
25. Naghadehi, M.Z., Jimenez, R., KhaloKakaie, R., & Jalali, S.-M.E. (2011). A probabilistic systems methodology to analyze the importance of factors affecting the stability of rock slopes. Engineering Geology, 118(3-4), 82-92.https://doi.org/10.1016/j.enggeo.2011.01.003
26. Kainthola, A., Verma, D., Gupte, S.S., & Singh, T.N. (2011). A coal mine dump stability analysis – a case study. Geomaterials, 01(01), 1-13.https://doi.org/10.4236/gm.2011.11001
27. Geoslope.com. (2019). GEOSLOPE Home. [online]. Available at:https://www.geoslope.com
28. Csuohio.edu. (2016). Academic Server. Cleveland State University. [online]. Available at: https://academic.csuohio.edu
29. Ox.ac.uk. (2013). A.B. Zavatsky. [online]. Available at:http://users.ox.ac.uk/~kneabz