Abstract
Construction activities in diversion tunnel of dam need to considere the stability of the tunnel which is very important factor for its continuity. In order to become a safe mining method, it is necessary to analyze the tunnel stability and excavation method using drill and blast method. This analysis is based on empirical method, which is approach using rock mass classification and analytical method based on stresses and deformation of rocks. Based on the analysis, there are three types of rocks passed by the diversion tunnel, i.e breccia, sandstone and claystone, with RMR value ranged from 36 to 51, poor rock class to fair rock class, 2,5 – 3 meters span, top heading bench excavation method, rockbolt, and shotcrete support system with thickness between 256 to 334 mm and steel support.
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