盾构隧道DRC管片的力学模型研究

he composite segment has been used in the deep, long large, and multi-cross-section shield tunnels of the subway, underground road, underground pedestrian passage and underground reservoir, etc. However, the mechanical behaviors of the composite segment are not clarified because the structural type is complicated, and the selected structure model and parameters are not reasonable. Compared with the closed-composite segment, DRC segment without top skin plate has quite different mechanical performance since the skin plate plays a significant role in closed-composite segment. Considering confined effect, interface slip and a stiffness reduction method was proposed to establish the structural model of 5-face composite segment in this paper. The proposed method can be used to solve the coupling of multi-material and multi-scale, and are suitable for a rational design of the composite segment because of improving the convergence of computations and having high precision and clear physical significance.