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China: The twin tunnels of Dadonggou Tunnel of Benhuan Expressway were successfully connected
The tunnel is one of the key and difficult control projects in the bidding section. The rock formations the tunnel passes through are mainly medium and strongly weathered granite, making it difficult to tunnel.
http://big5.news.cn/gate/big5/ln.news.cn/20240914/772fa74af0444816b1dae3a7658887c0/c.html
cover tunnel photo by: Matt Brown from London, England / CC BY
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http://big5.news.cn/gate/big5/ln.news.cn/20240914/772fa74af0444816b1dae3a7658887c0/c.html
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