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Drainage systems are important in tunnel projects. The condition of a drainage system has an impact on the stress condition and stability of the tunnel lining. To further reveal the difference between the stress condition and the stability of the tunnel lining of the drainage system under two block patterns, Zhongliangshan Tunnel was selected for field tests. On the basis of the tests, the stress on various parts of the tunnel lining and its variation trend were studied. Then, the numerical model of the tunnel was established with the finite element method and the numerical simulation results were compared with the field test results. On this basis, the stability of the tunnel when the drainage system was partially blocked was analyzed. Test results indicate a huge difference between the two block patterns of the drainage system in how they influence the lining stress. The finite element analysis confirms the reliability of the numerical model. The tunnel stability analysis shows that when the blocked lengths are 16 and 24 m, the reduction factors are approximately 10.3 and 9.7, respectively, and the tunnel stability is controlled by the symmetric block pattern of the drainage system. When the blocked lengths increase to 32 and 40 m, the reduction factors are reduced to 9.0 and 8.7, respectively, and the tunnel stability is controlled by the asymmetric block pattern. The length of the blocked part determines which block pattern controls the tunnel stability. In the case of asymmetric block, vault limit displacement is not recommended as an instability criterion.

Analysis on Stress and Stability of Lining in Partially-blocked Tunnel Drainage System