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LONGSHAN tunnel, with two-way three-lane and large span twin-arch, is located in Wuhu, Anhui province, China. The tunnel is shallow buried in all length and the maximum buried depth is less than 10m. Its geological structure is complicated and over 1/3 of the tunnel is located in fault zone, the classification of the surrounding rock belongs to class V. The on-site monitoring indicates that the stress...
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