Full-scale model tests and numerical investigations on bearing characteristics of superimposed lining structures under external loads

A full-scale mode test is proposed to study the transverse mechanical behaviors and deformation characteristics of segment-self compacted concrete (SCC)-steel superimposed linings. The deformation and mechanical response laws of composite lining structures under non-uniform external loads are revealed. Based on the 3D refined finite element model, the influences of studs, lining types and lateral pressure coefficient on the bearing capacity of the structures are discussed. The results show that the circumferential stress of the superimposed linings is lower than that of the separated ones under the action of non-uniform external loads, and the superimposed lining structures present a 'transverse ellipse’ deformation, and the deformation laws are more clear with the increase of load amplitude and non-uniformity. The studs can effectively enhance the interface performance of steel-SCC, but they have few effects on the circumferential stress of the structures.