Stability is the key issue in landslide stabilization. Methodology and component adopted in stabilizing the slide play vital role in this regards. In many occasion, stability measure adopted for controlling slide has been found to be unsuccessful, inadequate causing not only the safety risk but also huge economic loss. This paper describe history, effects, causes, stabilization measures and effectiveness of these measures played for controlling landslide of headwork area of Upper Mai Hydroelectric Project. The pioneering solution applied for landslide stabilization such as application of rock bolts, shotcrete and water management found to be highly effective in controlling the landslide.
This study involves comparison of predicted rock mass classes in design stage with actual rock mass classes of headrace tunnel of Upper Mai Hydroelectric Project. The total length of headrace tunnel is 2070.52 m. The lithology of the study area consists of gneiss, schistose gneiss and mica schist. The rock mass classifications, Q-system were used to predict rock mass classes during the design phase as well as for classify rock mass during excavation of headrace tunnel. The applicability and validity of proposed classification has been checked by comparing the prediction with actual observation after completion of excavation. It was found that the predicted classes does not exactly matches with the actual rock masses as a results effecting in construction time as well as in cost and economy of the project.
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