Topological self-locking shield tunnel segment, segment ring structure and tunnel

The invention provides a topological self-locking type shield tunnel segment and a segment ring structure, and belongs to the technical field of tunnel engineering. The topological self-locking type shield tunnel segment comprises an inferior-arc-shaped circular-arc-shaped segment body, side splicing faces are symmetrically arranged on the two opposite sides of the circular-arc-shaped segment body in the circumferential direction, each side splicing face comprises a first curved face and a second curved face which are matched with each other, and the circular-arc-shaped segment body is provided with a third curved face and a fourth curved face which are opposite to each other in the circumferential direction. And the two arc-shaped sheet bodies can be engaged and fixed by combining and splicing the first curved surface and the second curved surface, or are engaged and fixed by combining and splicing the third curved surface and the fourth curved surface. By means of the duct piece, self-locking type installat