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The prediction of rock burst and squeezing along the headrace tunnel of Upper Balephi ‘A’ hydropower project is presented in this paper. The rock mass classification along the headrace tunnel at various sections are presented. The assessment of potential rock burst is carried out using methods suggested by various researches and squeezing is predicted using empirical and semi-empirical methods. The support system design of a section in the headrace tunnel and at its junction with an underground vertical surge shaft is also presented. The support system suggested by the empirical RMR and Q-value method is compared with the support system suggested by convergence confinement method and safety factor is checked for the most demanding support system using numerical modeling. Three-dimensional modeling is carried out in sections where the longitudinal homogeneity of stress distribution is disturbed and plain strain condition is not valid. The finite element modeling is done using Phase for two-dimensional modeling and GTS NX for three-dimensional modeling at the junction of main tunnel with the surge shaft.

Prediction of Rock Burst, Squeezing and Support Design using Three-Dimensional and Conventional Methods Along Headrace Tunnel in Balephi, Nepal