METHOD TO CONSTRUCT STATION TUNNELS WITH LOW SUBSIDENCE OF EARTH SURFACE Russian patent published in 2013 - IPC E21D9/00 

FIELD: mining.

SUBSTANCE: method to construct station tunnels with low subsidence of earth surface includes erection of an advance support and a temporary support along a tunnel vault, erection of permanent lining and mining of bottomhole rock, according to the invention, in a bottomhole under protection of the advance support along the longitudinal axis of the tunnel there are injection fibreglass anchors installed, the temporary support is erected providing for maintenance of the advance support, and mounted from steel arcs directly following face advance with filling of the support space with concrete, the permanent lining is erected after temporary support concrete gains strength. At the same time injection fibreglass anchors are cut in layers with a tunnelling unit together with rock in the bottomhole as it advances. At the same time the advance support is erected by drilling of wells along the tunnel vault at the angle to its longitudinal axis, placement of metal pipes in wells and filling of pipes with cement mortar.

EFFECT: increased quality of tunnel construction by reduction of earth surface subsidence at main stages of construction.

2 cl, 2 dwg