Disposal slope design based on low-plasticity rock’s shear strength in coal mining activities


  • Harjuni Hasan Department of Mining Engineering, Mulawarman University
  • Revia Oktaviani Department of Mining Engineering, Mulawarman University
  • Tommy Trides Department of Mining Engineering, Mulawarman University
  • Dionisyus Fransiskus Sinaga Department of Mining Engineering, Mulawarman University




disposal, rock characteristic, slope design, slope stability


Slope stability is the primary factor in designing a stable slope. The strength of the disposal slope relies on the characteristic of the dump materials. The rock shear strength denotes rock ability to withstand the burden, both constant and dynamic load. The weakest material used as a reference in designing the disposal slope is siltstone in Pulaubalang formation (location-04). The safety value in Location 04 and 02 tend to drop quickly as the inclination increase, while the safety in location 01 and 03 tend to fall slowly. This indicates that rocks with a lower plasticity index tend to be stronger in steeper slope conditions. The slope geometry was designed to be 10, 15, 20, and 25 meters high with a slope angle of 10o, 15o, 20o, 25o, 30o, 35o, 40o, 45o, 50o, 55o, and 60o. The slope geometry is considered stable and safe. However, this study suggests that the most effective slope design is the slope with 25 meters high, overall slope of 25,3o; the single slope of 35o; berm width 4,66 meters, bench height of 5 meters, with the safety factor value of 4.30 (SF= 4.30).

Author Biography

Harjuni Hasan, Department of Mining Engineering, Mulawarman University

Lecturer Mining Engineering


Adebayo, B. and Adetula, B. 2013. Evaluation of physical and mechanical properties of rock for drilling condition classification. World Journal of Engineering 10(4):359-366, doi: 10.1260/1708-5284.10.4.359.

Ahangar-Asr, A., Faramarzi, A. and Javadi, A. 2010. A new approach for prediction of the stability of soil and rock slopes. Engineering Computations 27(7):878-893, doi: 10.1108/02644401011073700.

Anubhav, and Basudhar, P.K. 2010. Modeling of soil-woven geotextile interface behavior from direct shear test results. Geotextiles and Geomembranes 28(4):403-408, doi: 10.1016/j.geotexmem.2009.12.005.

Behera, P.K., Sarkar, K., Singh, A.K., Verma, A.K. and Singh, T.N. 2017. Erratum to: dump slope stability analysis – a case study. Journal of the Geological Society of India 88(6):725–735.

Carmichael, R.S. 2017. CRC Handbook of Physical Properties of Rocks. Vol. 3., CRC Press., Boca Raton, doi: 10.1201/9780203712030.

Chaulya, S.K. and Prasad, G.M. 2016. Slope failure mechanism and monitoring techniques. pp. 1–86 in Sensing and Monitoring Technologies for Mines and Hazardous Areas. Elsevier, doi:10.1016/b978-0-12-803194-0.00001-5.

Chiarelli, A.S., Shao, J.F. and Hoteit, N. 2003. Modeling of elastoplastic damage behavior of a claystone. International Journal of Plasticity 19(1):23-45, doi:10.1016/S0749-6419(01)00017-1.

Cho, Y.C. and Song, Y.S. 2014. Deformation measurements and a stability analysis of the slope at a coal mine waste dump. Ecological Engineering 68:189-199, doi:10.1016/j.ecoleng.2014.03.005.

Coduto, P.D., Kitch, W.A. and Yeung., M.C.R. 2011. Foundation Design: Principles and Practices (Vol. 2). Upper Saddle River: Prentice Hall.

Coduto, P.D., M.C.R. Yeung and W.A. Kitch, 2010. Geotechnical Engineering, Principles and Practices. PHI Learning Private Ltd. New Delhi, India.

Crawford, K.M. 2013. Determination of Bulk Density of Rock Core using Standard Industry Methods. Master's report. Master of Science in Civil Engineering, Michigan Technological University.

Das, B.M. and Sivakugan, N. 2018. Principles of Foundation Engineering. Cengage Learning, 200 First Stamford Place, Suite 400 Stamford, CT 06902 USA.

Davis, R.D., Gilman, J.W. and VanderHart, D.L. 2003. Processing degradation of polyamide 6/montmorillonite clay nanocomposites and clay organic modifier. Polymer Degradation and Stability 79(1):111-121, doi:10.1016/S0141-3910(02)00263-X.

Díaz, E., Pastor, J.L., Rabat, A. and Tomás, R. 2021. Machine learning techniques for relating liquid limit obtained by casagrande cup and fall cone test in low-medium plasticity fine grained soils. Engineering Geology 294, 106381, doi:10.1016/j.enggeo.2021.106381.

Hustrulid, W.A., McCarter, M.K. and Van Zyl, D.J.A. 2000. Slope Stability in Surface Mining. Publisher:Littleton, Colo. : Society for Mining, Metallurgy, and Exploration.

Huvaj, N. and Uyeturk, E. 2018. Effects of drying on atterberg limits of pyroclastic soils of Northern Turkey. Applied Clay Science 162:46-56, doi:10.1016/j.clay.2018.05.020.

Jones, L., Banks, V. and Jefferson, I. 2020. Swelling and shrinking soils. In: Giles, D.P. and Griffiths, J.S. (eds), Geological Hazards in the UK: Their Occurrence, Monitoring and Mitigation-Engineering Group Working Party Report, Geological Society, London, Engineering Geology Special Publications 29(1):223-242, doi:10.1144/EGSP29.8.

Knadel, M., Rehman, H.U., Pouladi, N., de Jonge, L.W., Moldrup, P. and Arthur. E. 2021. Estimating atterberg limits of soils from reflectance spectroscopy and pedotransfer functions. Geoderma 402, 115300, doi: 10.1016/j.geoderma.2021.115300.

Li, W., Bai, J., Cheng, J., Peng, S. and Liu, H. 2015. Determination of coal-rock interface strength by laboratory direct shear tests under constant normal load. International Journal of Rock Mechanics and Mining Sciences 77:60-67, doi:10.1016/j.ijrmms.2015.03.033.

Li, Z., Hu, Z., Zhang, X., Du, S., Guo, Y. and Wang, J. 2019. Reliability analysis of a rock slope based on plastic limit analysis theory with multiple failure modes. Computers and Geotechnics 110:132-247, doi: 10.1016/j.compgeo.2019.02.021.

Megel, A.J., Parker, D.B., Mitra, R. and Sweeten, J.M. 2006. Assessment of chemical and physical characteristics of bottom, cyclone, and baghouse ashes from the combustion of manure. Conference: 2006 American Society of Agricultural and Biological Engineers, Volume: ASABE Paper No. 06-4043

Nagaraj, H.B., Reesha, B., Sravan, M.V. and Suresh, M.R. 2015. Correlation of compaction characteristics of natural soils with modified plastic limit. Transportation Geotechnics 2:65-77, doi:10.1016/j.trgeo.2014.09.002.

O’Kelly, B.C., Vardanega, P.J. and Haigh, S.K. 2018. Use of fall cones to determine Atterberg limits: a review.Géotechnique 68(10):843-856, doi:10.1680/jgeot.17.R.039.

Oggeri, C., Fenoglio, T.M., Godio, A. and Vinai, R. 2019. Overburden management in open pits: options and limits in large limestone quarries. International Journal of Mining Science and Technology 29(2):217-228, doi:10.1016/j.ijmst.2018.06.011.

Renema, W., Warter, V., Novak, V., Young, J.R., Marshall, N. and Hasibuan, F. 2015. Ages of miocene fossil localities in the Northern Kutai Basin (East Kalimantan, Indonesia). Palaios 30(1):26-39, doi: 10.2110/palo.2013.127.

Rock, ASTM Committee D. 18 on Soil and. 2010. Standard test methods for liquid limit, plastic limit, and plasticity index of soils. ASTM international.

Sanei, M., Faramarzi, L., Fahimifar, A., Goli, S., Mehinrad, A. and Rahmati, A. 2015. Shear strength of discontinuities in sedimentary rock masses based on direct shear tests. International Journal of Rock Mechanics and Mining Sciences 75:119-131, doi:10.1016/j.ijrmms.2014.11.009.

Schissler, A.P. 2004. Coal mining, design and methods of. In: Cleveland, C.J. (ed), Encyclopedia of Energy. Elsevier Academic. pp. 485-494

Schön, J.H. 2015. Physical Properties of Rocks: Fundamentals and Principles of Petrophysics. 2nd Edition, Elsevier.

Sivakumar, V., Glynn, D., Cairns, P. and Black, J.A. 2009. A new method of measuring plastic limit of fine materials. Geotechnique 59(10):813-832, doi:10.1680/geot.2009.59.10.813.

Tan, H., Chen, F., Chen, J. and Gao, Y. 2019. Direct shear tests of shear strength of soils reinforced by geomats and plant roots. Geotextiles and Geomembranes 47(6):103491, doi:10.1016/j.geotexmem.2019.103491.

Yu, W., Li, K., Liu, Z., An, B., Wang, P. and Wu, H. 2021. Mechanical characteristics and deformation control of surrounding rock in weakly cemented siltstone. Environmental Earth Sciences 80(9):1-15, doi:10.1007/s12665-021-09626-2.

Yusuf, B., Oloruntobi, O. and Butt, S. 2019. The formation bulk density prediction for intact and fractured siliciclastic rocks. Geodesy and Geodynamics 10(6):446-454, doi:10.1016/j.geog.2019.05.005.








How to Cite

Hasan, H., Oktaviani, R., Trides, T., & Sinaga, D. F. (2022). Disposal slope design based on low-plasticity rock’s shear strength in coal mining activities. Journal of Degraded and Mining Lands Management, 10(1), 3821–3827. https://doi.org/10.15243/jdmlm.2022.101.3821



Research Article