Abstract
Landslides are common in the North-Eastern Himalayan state of Sikkim. Landslide is a serious geo-environmental disaster causing loss of life and property. Short duration high-intensity rainfall is one of the major factors driving these slope instabilities. Out of several such landslides, the Chanmari landslide has been susceptible to major mass movements for many years and rainfall infiltration is the triggering factor for these slope movements. To mitigate landslide disasters, stabilization of the slope is of utmost importance. Installation of horizontal drains within the slope is an effective way of stabilizing the slope by reducing the pore water pressures. Horizontal drains have already been successfully installed in residual soil slopes. A numerical study was carried out to understand the effect of horizontal drains on the Chanmari slope under rainfall infiltration. Parametric studies were conducted to find out the best possible layout of the drains. The slope failed within a few minutes due to the high-intensity rainfall. The drain installed at the middle of the slope kept the minimum factor of safety of the slope higher than the slope without a drain by lowering the water level within the slope. Multiple drains placed at the middle proved to be an effective drainage system.
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References
Bhasin R, Grimstad E, Larsen JO, Dhawan AK, Singh R, Verma SK, Venkatachalam K (2002) Landslide hazards and mitigation measures at Gangtok, Sikkim Himalaya. Eng Geol 64:351–368
Fredlund DG, Krahn J (1977) Comparison of slope stability methods of analysis. Can Geotech J 143:429–439
Fredlund DG, Morgenstern NR, Widger RA (1978) The shear strength of unsaturated soils. Can Geotech J 153:313–321
Fredlund DG, Rahardjo H (1993) Unsaturated soil mechanics. Wiley, New York
Geo-Slope (2021a) Seep/W Users manual. GEOSLOPE International, Calgary, Alberta, Canada
Geo-Slope (2021b) Slope/W User’s manual. GEOSLOPE International, Calgary, Alberta, Canada
Gjetvaj V, Nossan AS (2009) Increase of slope stability with time by drilled drains. In: Proceedings of the 17th International conference on soil mechanics and geotechnical engineering
Martin RP, Siu KL (1996) Use of Horizontal Drains for Slope Stabilisation in Hong Kong. HKIE Transactions 3(2):25–36
Mukhlisin M, Aziz N (2016) Study of horizontal drain effect on slope stability. J Geol Soc India 87:483–490
Rahardjo H, Hritzuk KJ, Leong EC, Rezaur RB (2003) Effectiveness of horizontal drains for slope stability. Eng Geol 69:295–308
Rahardjo H, Santoso VA, Leong EC, Ng YS, Hua CJ (2011) Performance of horizontal drains in residual soil slopes. Soils Found 51(3):437–447
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Chatterjee, D., Charan, O.S., Sharma, P. (2023). Design of Horizontal Drains for Chanmari Slope Stabilization at Sikkim. In: Mitra, S., Dasgupta, K., Dey, A., Bedamatta, R. (eds) Disaster Management and Risk Reduction: Multidisciplinary Perspectives and Approaches in the Indian Context. NERC 2022. Springer, Singapore. https://doi.org/10.1007/978-981-99-6395-9_6
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DOI: https://doi.org/10.1007/978-981-99-6395-9_6
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