METHOD FOR TUNNEL LINING FORMING Russian patent published in 2006 - IPC E02B9/06 

FIELD: hydraulic structure building and repair, particularly to construct and repair power tunnels of hydroelectric plant.

SUBSTANCE: method involves forming concrete tunnel lining; consolidating ground around concrete liner by injecting grouting mortar in rock and forming damping layer between concrete lining and grouted ground. Damping layer forming between concrete lining and ground is created after tunnel filling with water under working pressure and after concrete lining curing under water pressure for 1.5-2 years. After that water is discharged and gaps between concrete lining and grouted ground are detected. Damping layer is created by plugging space beyond the lining by injecting resilient grouting mortar in spaces between outer lining surface and ground massif. The resilient grouting mortar has modulus of elasticity equal to intermediate value between that of concrete lining material E_l and that of ground massif E_g.

EFFECT: increased tunnel service reliability due to reduced loads applied to lining.