Secondary stress simulation device for repaired buried pipeline and test method

The invention relates to the technical field of buried pipeline performance testing, in particular to a device and a method for simulating secondary stress of a repaired buried pipeline. A device for simulating secondary stress of a repaired buried pipeline comprises a loading frame, the loading frame comprises an upper loading plate and a lower bearing plate, the upper loading plate and the lower bearing plate are correspondingly arranged, a to-be-tested pipeline is accommodated between the upper loading plate and the lower bearing plate, a lining is accommodated in the to-be-tested pipeline, and the lining is arranged between the upper loading plate and the lower bearing plate. The inner wall of the to-be-tested pipeline is attached to the outer wall of the lining, and a vertical rod is arranged between the upper loading plate and the lower loading plate; the upper loading plate and the lower loading plate are close to each other or far away from each other in the direction of the vertical rod; the loading