Geological and Geotechnical Challenges Faced during Excavation of the Underground Powerhouse and Head Race Tunnel for Mangdechhu Project, Bhutan, India. Hydro Nepal [Internet]. 2018 Aug. 21 [cited 2026 Jul. 7];23:30-41. Available from: https://www.nepjol.info/index.php/HN/article/view/20823