Analyzing the Effect of Water on Stability of Rocky Slopes and Simulating Collapse: A Case Study of the Debris Slope Parallel to Rujban Mountain Road –NW Libya
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Abstract
On December 11, 2023, a sudden collapse occurred in a parallel rocky slope adjacent to Rajban Mountain Road, leading to the closure of the road section. This prompted the research idea of simulating the collapse and the influencing conditions to assist in understanding the collapse occurrence. This paper discusses the utilization of practical methods and the 'Rock Plan' software to simulate the stages of slope failure. The analysis of simulation outputs reveals the impact of moisture content on the factor of safety and the relationship between driving forces and resistance. This paper highlights the importance of resistance strength in maintaining slope stability and how it diminished under the influence of rainfall pressure and a 65% increase in moisture content, which resulted in the slope collapse. The results demonstrate the influence of internal cohesion and friction angles on slope stability, identifying them as the primary factors contributing to the collapse. The study emphasizes the importance of using laboratory experiments to determine cohesion values and friction angles. It recommends the necessity of debris removal from water drainage channels and the use of simulation programs to assess the stability of parallel slopes along mountain roads before their construction.
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References
Sopitthammakul, P. (2023). Landslide mapping and assessment along the M41 highway in the Pamir Mountains, southeast Tajikistan (Doctoral dissertation, University of Portsmouth United Kingdom).pp1-253
Ray, A., Bharati, A. K., Rai, R., & Singh, T. (2021). Landslide occurrences in Himalayan residual soil: a review. Himalayan Geology, 42(1), 189-204 [2]
Ibrahim, M. B., Salisu, S. A., Musa, A. A., Abussalam, B., & Hamza, S. M. (2022, July). Framework for the identification of shallow ground movement in modified slopes (an expert opinion). In IOP Conference Series: Earth and Environmental Science (Vol. 1064, No. 1, p. 012055). IOP Publishing [3]
Nadi, B., Tavasoli, O., Kontoni, D. P. N., & Tadayon, A. (2021). Investigation of rock slope stability under pore-water pressure and structural anisotropy by the discrete element method. Geomechanics and Geoengineering, 16(6), 452-464.
Yang, X., Diao, X., Zhou, T., Hu, F., & Wang, S. (2023). Study on the stability of accumulated layer landslide under the coupling action of earthquake and rainfall. KSCE Journal of Civil Engineering, 27(1), 98-108. [5]
Li, Z., Wu, R., Hu, T., Xiao, S., Zhang, L., & Zhang, D. (2023). Stability analysis of an unstable slope in chongqing based on multiple analysis methods. Processes, 11(7), 2178.
Marzen, M., Iserloh, T., De Lima, J. L., Fister, W., & Ries, J. B. (2017). Impact of severe rain storms on soil erosion: Experimental evaluation of wind-driven rain and its implications for natural hazard management. Science of the Total Environment, 590, 502-513. [7]
Mulyono, A., Subardja, A., Ekasari, I., Lailati, M., Sudirja, R., & Ningrum, W. (2018, February). The hydromechanics of vegetation for slope stabilization. In IOP Conference Series: Earth and Environmental Science (Vol. 118, p. 012038). IOP Publishing [8]
GATERA, Y. (2021). Developing guidelines for the protection of cut slope and embankment for roads in Rwanda (Doctoral dissertation, College of science and Technology) [9]
Shang, Y., Hyun, C. U., Park, H. D., Yang, Z., & Yuan, G. (2017). The 102 Landslide: human–slope interaction in SE Tibet over a 20-year period. Environmental earth sciences, 76, 1-16 [10]
Field study measurements 4/12/2023 [11]
Al-Rujban Meteorological Station 4/12/2023 [12]
Rahman, A. U., Zhang, G., A. AlQahtani, S., Janjuhah, H. T., Hussain, I., Rehman, H. U., & Shah, L. A. (2023). Geotechnical Assessment of Rock Slope Stability Using Kinematic and Limit Equilibrium Analysis for Safety Evaluation. Water, 15(10), 1924. [13]
Sengani, F., & Mulenga, F. (2020). Application of limit equilibrium analysis and numerical modeling in a case of slope instability. Sustainability, 12(21), 8870. [14]
Komadja, G. C., Pradhan, S. P., Oluwasegun, A. D., Roul, A. R., Stanislas, T. T., Laïbi, R. A., ... & Onwualu, A. P. (2021). Geotechnical and geological investigation of slope stability of a section of road cut debris-slopes along NH-7, Uttarakhand, India. Results in Engineering, 10, 100227 [15]
Wei, W. B., Cheng, Y. M., & Li, L. (2009). Three-dimensional slope failure analysis by the strength reduction and limit equilibrium methods. Computers and geotechnics, 36(1-2), 70-80 [16]
Khalifa Abdunaser., et al. The Geologic Contribution To The Mountain Slopes Instability And Its Effect On Rock fall Hazards. A Case Study To The Zintan Road, Jabal Nafusah, Libya, (2022), The Fifth Conference for Engineering Science and Technologies Jadu – Libya,20-22, 2022 [17]
K.Oun, O. Hlal, (2021), Short Notes And Field Guidebook to The Gharian-Taghmah Area, At The First Scientific Conference For The College Of Oil And Gas Engineering, March 18-20-2021, Pp 1-65 [18]
TolouKian, A. R., Sadeghi, J., & Zakeri, J. A. (2018). Large-scale direct shear tests on sand-contaminated ballast. Proceedings of the Institution of Civil Engineers-Geotechnical Engineering, 171(5), 451-461 [19]
Alakhdar, A., Abudiena, A. (2022). Stability Study of sandstone slope parallel to the abu rashada mountain road in gharyan area NW Libya. Journal of Pure & Applied Sciences, 21(4), 104-110. [20]
User’s Guide for Rocplane software. (2001). Rocscience Inc, pp. 1-14