Design and Research of Shield Tunnel Model Considering Ring Joints
Based on the similarity theory and the existing research results,a spring and bolt ring joint is proposed to simulate the tensile and bending capacity of shield tunnel joints.A shield tunnel model considering the ring joint is designed and fabricated,with the main body made of specific proportions of gypsum and diatomaceous earth mix,and the ring joint is simulated by external springs and embedded bolts.The design of the tunnel model joints is described,and the mechanical properties of the shield tunnel model are tested.The research results show that the convergence value of the tube sheet diameter in the model tunnel is stable and almost linear,and when the tunnel depth is 1.50d,the maximum convergence value of the tube sheet diameter is 25.1mm,and at this time,the bending moment of the tube sheet is in the form of a peanut-shaped distribution,and the maximum bending moment is 93.1kN·m.The convergence value of tube sheet diameter and internal force distribution obtained from the model test are more in line with the actual situation,indicating that the model tunnel bearing capacity is reliable,and the simulation effect of tube sheet and joints is good.
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