Fabricated prestressed UHPC (Ultra High Performance Concrete) composite tunnel lining structure and construction method thereof

The invention discloses a fabricated prestressed UHPC (Ultra High Performance Concrete) composite tunnel lining structure and a construction method thereof, the tunnel lining structure comprises a primary support and a secondary lining, the primary support comprises an anchor rod and a UHPC sprayed concrete layer on the inner surface of surrounding rock; the secondary lining is of a prestress assembly type structure and is composed of a plurality of rings of UHPC duct pieces, each ring of UHPC duct piece comprises four segments, namely a vault segment, a left wall segment, a right wall segment and an inverted arch segment, annular connecting joints arranged among the four segments and longitudinal connecting joints arranged among all the rings of UHPC duct pieces are tongue-and-groove type joints, and the tongue-and-groove type joints are matched with the tongue-and-groove type joints. And prestressed steel beams are arranged in the circumferential direction and the longitudinal direction. The structure is re