Abstract
An idea of the rocks and general geology in the tunnel site is an important basis for developing more effective tunnel design and construction decision support systems to avoid adverse and unforeseen geological conditions in the construction of a tunnel. The main classification systems for rock support estimates, the Q and the RMR, use the most important ground features or parameters as input. The Kameng Hydro-Electric Project (KaHEP) situated in West Kameng district of Arunachal Pradesh is going to use tunnel for channelling the water collected in the reservoir of upstream of Bichom Dam to the powerhouse located at Kimi. An attempt has been made to study different geological parameters, such as Rock Quality Designation (RQD), Rock mass Quality (Q) and Rock Mass Rating (RMR) to classify the rock mass, estimate the stand-up time and to select the support systems. The rock types of the study area comprise mainly of highly fractured quartzite with shear and sericite schist and carbonaceous schist alteration. The stand-up time of the tunnel is very less as the rock mass quality is very poor and poor respectively so it requires immediate support after excavation
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