Numerical Study on the Influence of Lining Cracking on the Tunnel Lining
This paper presents a case history of the second-west Xiamen subway project of the upper-span Subway Line No.1.A three-dimensional numerical model of the lining structure with cracks is established by using the FLAC3D finite difference software and the displacement method in the structural mechanics.The development of the lining crack width in the tunnel de-formation modes is simulated.The feasibility of the simulation method is verified by comparing with the measured data.At the same time,numerical experiments are designed to study the influence of the different crack depth and the circumferential length on the lining section.The results show that,compared with the measured results,the numerical results are larger,but their changing rules are consistent,which basically verifies the feasibility of the analytical model and the simulation method.The in-crease of the cracking depth and the circumferential length will lead to the increase of the cumulative variation of the cracking width in tensile strain zone,and lead to the increase of axial stress at the crack section and the axial stress of reinforcement,in which the effect of cracking depth is more significant.
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