Document Type : Original Research Paper


1 Faculty of Land Resources Engineering, Kunming University of Science and Technology, Yunnan, China

2 Department of Mining Engineering, Karakoram International University (KIU), Gilgit, Pakistan

3 Department of Mining and Mineral Resources Engineering, NUST, Balochistan Campus, Quetta, Pakistan


The study utilizes the Limit Equilibrium Method (LEM) to investigate slope movements. These movements were initially generated by construction activities at the slope's base, and subsequent events were driven by seismic activities, as the study studied area lies within the Main Karakoram Thrust (MKT) and Main Mantle Thrust (MMT) zones. Soil samples, characterized by a moisture content of 13% and a dry unit weight of 18.14 kN/m³ were analyzed. The study revealed that an increase in saturation caused by rainwater infiltration, resulted in a reduction in unconfined compression strength, decreasing from 712 kPa to 349 kPa. The shear strength and deformation parameters (cohesion, angle of internal friction, and deformation modulus) were also examined with varied degrees of saturation. The results revealed a decrease in these parameters as the percentage of saturation increased from 30% to 90%. The slope stability study revealed that the Factor of Safety (FOS) reduced from 1.85 to 0.86 as the saturation of the material raised from 30% to 90%. To assess the influence of unit weight, cohesion, and angle of internal friction on the FOS, multiple cases were considered. The analysis revealed that the FOS increased with higher cohesion and angle of internal friction, while an increase in unit weight resulted in a lower factor of safety. Furthermore, stability of the slope was evaluated by modifying the slope geometry such as lowering the height. According to the GeoStudio investigation, the slope remained steady even at saturation levels exceeding 80%.


Main Subjects

[1]           G. Yan, S. Liang, X. Gui, Y. Xie, and H. Zhao, (2019). "Optimizing landslide susceptibility mapping in the Kongtong District, NW China: comparing the subdivision criteria of factors," Geocarto International, Vol. 34, pp. 1408-1426.
[2]           M. Mohebbi, A. Y. Bafghi, M. F. Marji, and J. Gholamnejad, (2017). "Rock mass structural data analysis using image processing techniques (Case study: Choghart iron ore mine northern slopes)," Journal of Mining and Environment, Vol. 8, pp. 61-74.
[3]           M. M. Samieinejad, N. S. Hosseini, and K. Ahangari,( 2017). "A field investigation of application of digital terrestrial photogrammetry to characterize geometric properties of discontinuities in open-pit slopes," Journal of Mining and Environment, Vol. 8, pp. 455-465.
[4]           Q. Zaruba and V. Mencl,(2014) Landslides and their control: Elsevier.
[5]           M. V. Sivakumar,(2005) "Impacts of natural disasters in agriculture, rangeland and forestry: an overview," Natural disasters and extreme events in agriculture: Impacts and mitigation, pp. 1-22.
[6]           I. Yilmaz,(2010). "Comparison of landslide susceptibility mapping methodologies for Koyulhisar, Turkey: conditional probability, logistic regression, artificial neural networks, and support vector machine," Environmental Earth Sciences, Vol. 61, pp. 821-836.
[7]           H. Khan, M. Shafique, M. A. Khan, M. A. Bacha, S. U. Shah, and C. Calligaris,(2019) "Landslide susceptibility assessment using Frequency Ratio, a case study of northern Pakistan," The Egyptian Journal of Remote Sensing and Space Science, Vol. 22, pp. 11-24.
[8]           H. Gardezi, M. Bilal, Q. Cheng, A. Xing, Y. Zhuang, and T. Masood,(2021). "A comparative analysis of attabad landslide on january 4, 2010, using two numerical models," Natural Hazards, Vol. 107, pp. 519-538.
[9]           A. Carrara, (1993)."Uncertainty in evaluating landslide hazard and risk," in Prediction and Perception of Natural Hazards: Proceedings Symposium, 22–26 October 1990, Perugia, Italy , pp. 101-109.
[10]         S. Kawamura and S. Miura, (2012)."Stability evaluation of slope with soft cliff," International Journal of Geotechnical Engineering, Vol. 6, pp. 185-191.
[11]         A. M. Santoso, K.-K. Phoon, and S.-T. Quek,(2011). "Effects of soil spatial variability on rainfall-induced landslides," Computers & Structures, Vol. 89, pp. 893-900.
[12]         S. A. Khattab, B. J. Al-Sulaifanie, and A. M. M. alarna,(2021). "Stability of unsaturated soil slopes subjected to external load and rainfall," International Journal of Geotechnical Engineering, Vol. 15, pp. 633-641.
[13]         T.-L. Tsai and H.-F. Chen, (2010)."Effects of degree of saturation on shallow landslides triggered by rainfall," Environmental Earth Sciences, Vol. 59, pp. 1285-1295.
[14]         L. Xu, M. R. Coop, M. Zhang, and G. Wang,(2018) "The mechanics of a saturated silty loess and implications for landslides," Engineering Geology, vol. 236, pp. 29-42.
[15]         M. Waseem, M. Safdar, T. ul Haq, F. Shah, W. Ahmad, and N. Ahmad, (2021)."Slope Stability Analysis of the Qalandarabad Landslide," Technical Journal, Vol. 26, pp. 1-17.
[16]         M. F. Ahmed, J. D. Rogers, and K. Farooq,(2012). "Impacts of saturation on rainfall-triggered slope failures at the Simbal Landslide, Pakistan," in ARMA US Rock Mechanics/Geomechanics Symposium,  pp. ARMA-2012-551.
[17]         S. Zhang, L. M. Zhang, and T. Glade, (2014)."Characteristics of earthquake-and rain-induced landslides near the epicenter of Wenchuan earthquake," Engineering Geology, Vol. 175, pp. 58-73.
[18]         K. S. Shah, M. H. B. Mohd Hashim, and K. S. B. Ariffin,(2021). "Monte Carlo Simulation-based Uncertainty Integration into Rock Particle Shape Descriptor Distributions," Journal of Mining and Environment, Vol. 12, pp. 299-311.
[19]         X. Fu, Q. Sheng, G. Li, Z. Zhang, Y. Zhou, and Y. Du (2020). "Analysis of landslide stability under seismic action and subsequent rainfall: a case study on the Ganjiazhai giant landslide along the Zhaotong-Qiaojia road during the 2014 Ludian earthquake, Yunnan, China," Bulletin of Engineering Geology and the Environment, Vol. 79, pp. 5229-5248.
[20]         E. Khorasani, M. Amini, and M. F. Hossaini, (2019)."Effect of large blocks position on stability analysis of block-in-matrix slopes," Journal of Mining and Environment, Vol. 10, pp. 465-477.
[21]         H. Sarfaraz, M. H. Khosravi, and M. Amini,(2019). "Numerical analysis of slide-head-toppling failure," Journal of Mining and Environment, Vol. 10, pp. 1001-1011.
[22]         H. Sarfaraz, A. R. Bahrami, and R. Samani (2022). "Numerical Modelling of Slide-Head-Toppling Failure using FEM and DEM Methods," Journal of Mining and Environment, Vol. 13, pp. 269-280.
[23]         H. Sarfaraz and M. M. Amini, (2020)."Numerical Modeling of Rock Slopes with a Potential of Block-Flexural Toppling Failure," Journal of Mining and Environment, Vol. 11, pp. 247-259.
[24]         H. Sarfaraz, (2020). "Stability analysis of block-flexural toppling of rock blocks with round edges," Journal of Mining and Environment, Vol. 11, pp. 1217-1229.
[25]         S. P. Singh and A. K. Roy, "Slope Stability Analysis and Preventive Actions for a Landslide Location along NH-05 in Himachal Pradesh, India," 2022.
[26]         M. A. Adil, S. Raza, and I. Amin,(2021). "Rock Fall Hazard Assessment using GeoRock 2D along Swat Motorway, Pakistan," Journal of Mining and Environment, Vol. 12, pp. 351-365.
[27]         S. Hussain, Z. U. Rehman, N. M. Khan, I. Ahmad, S. Raza, M. Tahir et al., "Proposing a Viable Stabilization Method for Slope in a Weak Rock Mass Environment using Numerical Modelling: a Case Study from Cut Slopes," 2022.
[28]         H. Fattahi, (2017)"Prediction of slope stability using adaptive neuro-fuzzy inference system based on clustering methods," Journal of Mining and Environment, Vol. 8, pp. 163-177.
[29]         M. Ataei and S. Bodaghabadi,(2008). "Comprehensive analysis of slope stability and determination of stable slopes in the Chador-Malu iron ore mine using numerical and limit equilibrium methods," Journal of China University of Mining and Technology, Vol. 18, pp. 488-493.
[30]         H. Fattahi, N. Babanouri, and Z. Varmaziyari,(2018). "A Monte Carlo simulation technique for assessment of earthquake-induced displacement of slopes," Journal of Mining and Environment, Vol. 9, pp. 959-966.
[31]         A. Walia and A. K. Roy, (2022)."Assessment of Slope Stability and its Remedies in Palampur, Himachal Pradesh,".
[32]         M. Shafique, B. Faiz, A. S. Bacha, and S. Ullah,(2018). "Evaluating glacier dynamics using temporal remote sensing images: a case study of Hunza Valley, northern Pakistan," Environmental earth sciences, Vol. 77, pp. 1-11,.
[33]         T. Khan, M. A. Khan, M. Q. Jan, and M. Latif, (1996)."The Kohistan between Gilgit and Chilas, northern Pakistan: regional tectonic implications," Journal of Nepal Geological Society, Vol. 14, pp. 1–10, 11/01.
[34]         M. Petterson,(2010). "A Review of the geology and tectonics of the Kohistan island arc, north Pakistan," Geological Society of London Special Publications, Vol. 338, pp. 287-327, 09/28.
[35]         M. Khan, S. Nawaz, and A. E. Radwan,(2023). "New insights into tectonic evolution and deformation mechanism of continental foreland fold-thrust belt," Journal of Asian Earth Sciences, Vol. 245, p. 105556, 2023/04/15/.
[36]         N. Abbas, K. Li, A. Khan, and J. A. Qureshi, (2022)."The influence of thermal breakage on physio-mechanical behavior of Ghulmet marble north Pakistan," International Journal of Mining & Geo-Engineering, Vol. 56.
[37]         R. S. Ganjeh, H. Memarian, M. H. Khosravi, and M. Mojarab,(2019). "A comparison between effects of earthquake and blasting on stability of mine slopes: a case study of Chadormalu open-pit mine," Journal of Mining and Environment, Vol. 10, pp. 223-240.
[38]         A. Alikhani, M. T. Moghadder, and H. Mohammadi, (2019)."Investigation of Bishop’s and Janbu’s models Capabilities on Slope Stability Problems with Special Consideration to Open-Pit Mining Operations," Journal of Mining and Environment, Vol. 11, pp. 161-170.
[39]         D. Astm, (2007)."698; Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort," ASTM International: West Conshohocken, PA, USA.
[40]         H. Sarfaraz, M. H. Khosravi, and T. Pipatpongsa,(2021). "Numerical Stability Analysis of Undercut Slopes Evaluated by Response Surface Methodology," Journal of Mining and Environment, Vol. 12, pp. 31-43.
[41]         H. Dana, R. K. Kakaie, R. Rafiee, and A. Y. Bafghi,(2018). "Effects of geometrical and geomechanical properties on slope stability of open-pit mines using 2D and 3D finite difference methods," Journal of Mining and Environment, Vol. 9, pp. 941-957.
[42]         K. Goshtasbi, M. Ataei, and R. Kalatehjary, (2008)."Slope modification of open pit wall using a genetic algorithm — case study : southern wall of the 6 th Golbini Jajarm bauxite mine,".
[43]         A. Daftaribesheli, M. Ataei, and F. Sereshki, (2011)."Assessment of rock slope stability using the Fuzzy Slope Mass Rating (FSMR) system," Applied Soft Computing, Vol. 11, pp. 4465-4473, 2011/12/01/.
[44]         N. U. Morgenstern and V. E. Price(1965). "The analysis of the stability of general slip surfaces," Geotechnique, Vol. 15, pp. 79-93.
[45]         R. Orense, K. Farooq, and I. Towhata, (2004)."Deformation behavior of sandy slopes during rainwater infiltration," Soils and Foundations, Vol. 44, pp. 15-30.
[46]         J. W. Godt, R. L. Baum, and N. Lu,( 2009). "Landsliding in partially saturated materials," Geophysical research letters, Vol. 36.
[47]         A. Kainthola, P. Singh, and T. Singh, (2015)."Stability investigation of road cut slope in basaltic rockmass, Mahabaleshwar, India," Geoscience Frontiers, Vol. 6, pp. 837-845.
[48]         M. N. Amin, M. Umair Ashfaq, H. Mujtaba, S. Ehsan, K. Khan, and M. I. Faraz,(2022). "Computer-Aided Slope Stability Analysis of a Landslide—A Case Study of Jhika Gali Landslide in Pakistan," Sustainability, Vol. 14, p. 12954.
[49]         k. S. shah, N. Abbas, L. Kegang, M. H. b. Mohd Hashim, H. U. Rehman, and K. G. Jadoon,(2023). "Analysis of Granite Failure Modes and Energy Conversion under Uniaxial Compression at Various Temperatures," Journal of Mining and Environment, Vol. 14, pp. 493-506.
[50]         N. Abbas, K. G. Li, N. Abbas, and R. Ali, (2022)."Correlation of Schmidt Hammer Rebound Number and Point Load Index with Compressive Strength of Sedimentary, Igneous and Metamorphic Rocks," Journal of Mining Science, Vol. 58, pp. 903-910, 2022/12/01.
[51]         V. M. Bowa, W. Samiselo, E. Manda, L. Yan, W. Zhou, A. Shane et al.,(2022). "Wedge Failure Analysis of the Slope Subjected to Uplift Forces by Analytical Method at Chingola Open Pits F & D,".
[52]         M. Hoy, C. B. Doan, S. Horpibulsuk, A. Suddeepong, A. Udomchai, A. Buritatum et al.,(2024). "Investigation of a large-scale waste dump failure at the Mae Moh mine in Thailand," Engineering Geology, Vol. 329, p. 107400, 2024/02/01/.
[53]         L. S. Dilta and R. K. Sharma, (2023)."Numerical Analysis of Strip Footing Behaviour on a Hollow Pile Stabilized Clay Slope," Journal of Mining and Environment, Vol. 14, pp. 799-811.
[54]         R. Koner and K. Chand, "Internal Mine Dump Slope Stability and Failure Zone Identification using 3D Modelling."
[55]         W. Ouyang, S.-W. Liu, and Y. Yang,(2022). "An improved morgenstern-price method using gaussian quadrature," Computers and Geotechnics, Vol. 148, p. 104754.
[56]         T. A. Wagay and M. Suthar, "Study of Slope Stability using Flexible Facing."
[57]         H. M. Shiferaw, (2021)."Study on the influence of slope height and angle on the factor of safety and shape of failure of slopes based on strength reduction method of analysis," Beni-Suef University Journal of Basic and Applied Sciences, Vol. 10, p. 31, 2021/05/07.
[58]         Y. Yoshida, J. Kuwano, and R. Kuwano, (1991)."Effects of Saturation on Shear Strength of Soils," Soils and Foundations, vol. 31, pp. 181-186, 1991/03/01/.
[59]         Z. Wang, W. Zhang, X. Gao, H. Liu, and T. Böhlke,(2020) "Stability analysis of soil slopes based on strain information," Acta Geotechnica, Vol. 15, pp. 3121-3134, 2020/11/01.