| Abstract: | The Jinping Diversion Tunnel #1 and #2, as a result of 40-50 MPa geostress in the western engineering, seriously deformed in early stage of the construction. In this paper, the measures that were carried out during the bench excavation of horseshoe-shaped tunnel of 14.6m in diameter, and added on the basis of general support of bolting net and shotcrete, including long mortar bolt, prestressed bolt, anchor cable, anchor bar pile, grouting reinforcement, were introduced; moreover, monitoring by various ways was conducted in relation to the engineering. The practice has proved that good effect is obtained. |
