Numerical Simulation Study on the Influence of Cavity Behind Lining on Tunnel Structure Safety

Junbo Zhao

doi:10.54097/wnbnt016

Authors

Junbo Zhao

DOI:

https://doi.org/10.54097/wnbnt016

Keywords:

lining cavity, numerical simulation, tunnel safety.

Abstract

The total length of tunnels in China has ranked first in the world. However, in the construction of railway tunnels in difficult mountainous areas, it is easy to have cavity behind lining tunnel (CBLT) diseases. Moreover, in the operational tunnels, the proportion of CBLT diseases is also high. Therefore, the influence of CBLT on the safety of tunnel lining structure should be studied which is of great significance for ensuring safety and prolonging service life. Based on ABAQUS finite element analysis (FEA) software, the numerical models of CBLT are established respectively under four different working conditions: No CBLT, CBLT is on the arch bottom, arch top, spandrel. By comparing the displacement deformation characteristics, stress change characteristics and compression damage characteristics of the tunnel structure under these four working conditions, the law of the influence of cavity positions on the safety of the tunnel structure is obtained. Research results show that the influences of different positions of CBLT on the safety performance of lining structures are different. This research can be used to analyze the safety of tunnel structure in the presence of CBLT disease and guide the safety evaluation of tunnel.

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