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Finite element modelling of landslide prone slopes around Rudraprayag and Agastyamuni in Uttarakhand Himalayan terrain

Author

Listed:
  • S. P. Pradhan

    (Indian Institute of Technology Roorkee)

  • Vikram Vishal

    (Indian Institute of Technology Bombay
    Monash University)

  • T. N. Singh

    (Indian Institute of Technology Bombay)

Abstract

Himalayan mountain chains are neo-tectonically active and significantly susceptible to frequent geohazards like landslides, earthquakes, cloudburst and flash floods, etc. Himalayan slopes are characterized by highly fractured, jointed and sheared rock mass. This affects the strength of the rocks and thus largely influences the stability characteristic of slopes which have been aggravated by human intervention. The ongoing developmental activities, particularly in the last two decades, are responsible for large-scale destabilization of slopes. In rugged terrain, safer designs along hill-cut roads must be ensured. Despite extensive geotechnical works for slope stabilization done in the Himalayan range, slope sections evolve due to various natural and man-made factors are need to be understood in greater details. Proper evaluation and treatment were done on the cut slopes that are severely affected during Kedarnath disaster of June 2013. One of such roads is national highway from Rudraprayag to Gaurikund near Kedarnath. In this study, the stability of vulnerable road cut slopes from Rudraprayag to Agastmuni was investigated. Three key road cut slopes were considered. Finite element analysis was conducted using PLAXIS simulator. Factors of safety, stress, strain, horizontal and vertical displacement have been determined for each slope. The most unstable slope had a factor of safety (FoS) equal to 0.935, while the most stable slope had FoS equal to 2.56. Outcomes from simulation are in good agreement with the prevailing field conditions. Slope stability evaluation must be performed to ensure better safety and to achieve disaster mitigated design.

Suggested Citation

  • S. P. Pradhan & Vikram Vishal & T. N. Singh, 2018. "Finite element modelling of landslide prone slopes around Rudraprayag and Agastyamuni in Uttarakhand Himalayan terrain," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 94(1), pages 181-200, October.
  • Handle: RePEc:spr:nathaz:v:94:y:2018:i:1:d:10.1007_s11069-018-3381-1
    DOI: 10.1007/s11069-018-3381-1
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    References listed on IDEAS

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    1. V. Vishal & T. Siddique & Rohan Purohit & Mohit K. Phophliya & S. P. Pradhan, 2017. "Hazard assessment in rockfall-prone Himalayan slopes along National Highway-58, India: rating and simulation," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 85(1), pages 487-503, January.
    2. T. Siddque & S. P. Pradhan, 2018. "Stability and sensitivity analysis of Himalayan road cut debris slopes: an investigation along NH-58, India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 93(2), pages 577-600, September.
    3. T. Singh & A. Gulati & L. Dontha & V. Bhardwaj, 2008. "Evaluating cut slope failure by numerical analysis—a case study," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 47(2), pages 263-279, November.
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    1. Sahil Sardana & A. K. Verma & Rahul Verma & T. N. Singh, 2019. "Rock slope stability along road cut of Kulikawn to Saikhamakawn of Aizawl, Mizoram, India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 99(2), pages 753-767, November.
    2. Tariq Siddique & M. E. A. Mondal & S. P. Pradhan & M. Salman & M. Sohel, 2020. "Geotechnical assessment of cut slopes in the landslide-prone Himalayas: rock mass characterization and simulation approach," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 104(1), pages 413-435, October.

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