Impact Analysis of Water-filled Cavities behind Lining for Tunnel Structure Safety
The existence of water-filled cavities behind lining leads to the more complicated stress for tunnel, which might easily cause tunnel disasters. In a separate six-lane highway tunnel, for example, use MIDAS/GTS finite element software, to establish the load structure model of water-filled cavities, respectively calculate and analyze the safety situation of cavities with water tunnel section structure in different range of vault, arch and haunch. The calculation shows that tunnel lining without cavities has the largest structural safety factor. The cavities with water of vault have greatest impact for lining structural safety situation. When the range of cavities with water behind lining is more than 10°, tunnel structure safety margin will be significantly decreased.
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