The research, along with specific site investigations, provides helpful guide for renovation and prevention of concrete lining erosion in tunnels passing through pyrite-bearing strata.

研究结果结合具体的隧道工点调查，可以为穿越含黄铁矿地层的隧道混凝土病害整治和预防提出了针对性很强的工程措施。

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The present damage situation of railway operation tunnels is very serious, sometimes they even threaten the traffic safety of the trains passing through the tunnel.

目前铁路运营隧道病害状况严重，有些已达到了威胁铁路行车安全的程度。

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There are guided tours through the city's underground tunnels and passing by esoteric symbols, Masonic buildings, historic crime scenes and even some ghosts ( www.somewhere.it).

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