ABSTRACT
This study presents a comprehensive assessment of rockfall hazards at the employer’s permanent campsite of Rasuwagadhi Hydroelectric Project (111 MW), located in the high-grade metamorphic rocks of the Higher Himalaya, Nepal. The project encountered significant rockfall events, especially following the 2015 Gorkha earthquake, which threatened the construction of the employer’s permanent campsite and the safety of project staff. Detailed field observations, rockfall simulations, and analysis of rockfall trajectories were carried out to propose effective mitigation measures for securing the camp areas (Camp-1 and Camp-2). The study used 2D and 3D rockfall simulation models, focused on key parameters such as rock block size, trajectory, energy levels, and bouncing heights. Mitigation strategies were proposed to minimize future hazards and ensure safe operation, including constructing anchored gabion structures, slope modifications, and installing flexible rockfall barriers. The results provide valuable insights into hazard management for similar projects in challenging geological terrains.
