Round foundation pit structure and construction method thereof

The invention discloses a circular foundation pit structure and a construction method thereof, and relates to the technical field of foundation pit construction, the circular foundation pit structure comprises an underground diaphragm wall and multiple layers of linings, the underground diaphragm wall is cylindrical and extends to the ground from the underground, the multiple layers of linings are arranged on the surface of the underground diaphragm wall layer by layer from top to bottom in the circumferential direction, and the multiple layers of linings are arranged on the surface of the underground diaphragm wall. And the supporting plates are connected with the underground diaphragm wall to form an integral supporting structure. According to the circular foundation pit structure, the underground diaphragm wall in the main body structure serves as a supporting structure, the lining fixed to the surface of the underground diaphragm wall serves as a foundation pit support, an inner support does not need to b