#IMC: September 14 - 18 2025

Mechanisms of Slope instabilities along the Hill Roads of Nepal: A Case Study from Beni-Jomson Road, Gandaki Province

Assigned Session: FS 3.502: Natural hazards in mountainous regions – Introduction to the different types of natural hazards common in mountain regions

Abstract ID: 3.11066 | Accepted as Talk | Talk/Oral | TBA | TBA

Prakash Chandra Ghimire (0)
Dhital, Meghraj (2), Paudayal, Khum Narayan (3)
Prakash Chandra Ghimire ((0) Tribhuvan University, Kirtipur, 44600, Kathmandu, Bagmati, NP)
Dhital, Meghraj (2), Paudayal, Khum Narayan (3)

(0) Tribhuvan University, Kirtipur, 44600, Kathmandu, Bagmati, NP
(1) Tribhuvan University,Central Department of Geology, Kathmandu, Nepal

(1) Tribhuvan University,Central Department of Geology, Kathmandu, Nepal

Categories: Soil-Hazards
Keywords: Hill Roads, Himalaya, Slope instabilities

Categories: Soil-Hazards
Keywords: Hill Roads, Himalaya, Slope instabilities

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Nepal is situated in the seismically active Himalayan region, where the construction of roads has notably increased the frequency of slope instabilities. These instabilities, including landslides, rockfalls, topple events, debris flows, and gully erosion, are commonly observed along roads in the Nepal Himalayas. This research investigates the causes and mechanisms behind landslides along a section of the Beni-Jomsom Road in Gandaki Province, Nepal. The study applies time series analysis to examine the mechanisms and frequencies of different instability types, taking into account various environmental factors along the road. The research employs specific tools GIS, WAVELET, SPSS, ORIGIN to analyze the landform, surrounding geology, geological structures, and geotechnical characteristics of the soil and rocks. The study reveals that the primary causes of instability along the road are translational slides, debris flows, and rockfalls/rockslides, with these events occurring repeatedly after road construction. The results highlight a clear connection between road-building activities and the occurrence of slope instability in the region. This research will serve as an important reference for authorities, providing valuable insights for managing and mitigating slope instability in future road construction projects.

Key Words: Hill Roads, Slope instabilities, Mechanism, Time series analysis, Himalaya.

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