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IJSTR >> Volume 7 - Issue 1, January 2017 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Analysis Of Tunnel Squeezing Phenomenon In Hydropower Project

[Full Text]



Season Maharjan



Tunnel, Squeezing, deformation, rock mass, case study, Hydropower projects, Himalayas.



The challenges in underground excavation depends upon rock mass strength, method of excavation and stress and deformation behavior of rock. It is important to obtain reliable estimates of these problem as early as possible in order to carry out construction with least difficulties. Squeezing is one of the common problems in excavation in Himalayan region where weak rock mass moves radially inward leading to decrease in size of excavated portion. Different methods has been used for the estimation of potential squeezing phenomenon. As rock consists of complex formations and exhibit a wide range of behaviors, the analytical methods provided some approximate solutions only. For the simulation of deformation and support behavior, numerical approach has been carried out for the case study of Ankhu Khola Hydropower Project (42.9MW). RMR and Q-Value were found to be poor to fair for Phyllite schist with overburden varying from 49 m to 613m for headrace tunnel of the same project. Consequently, support system has been designed for the potential squeezing sction.



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