Segment monitoring method of quasi-rectangular shield tunnel

The invention discloses a segment monitoring method of a quasi-rectangular shield tunnel. The method includes the following steps that: a total station is arranged at the rear part of the quasi-rectangular shield tunnel; a plurality of segment blocks are spliced together to form an integrated-loop segment of the quasi-rectangular shield tunnel, a plurality of segment blocks to be measured are selected from the plurality of segment blocks, and an intervisible state is constantly maintained between the segment blocks to be measured and the total station in a tunnel construction process; biaxial tiltmeters and target prisms are arranged on the segment blocks to be measured; the initial angles and current angels of the segment blocks to be measured are obtained through the biaxial tiltmeters, the initial coordinate information and current coordinate information of the target prisms are obtained through the total station; and the initial angles and current angels of the segment blocks to be measured are compared,