深埋长大隧道高地温引起的热害将给隧道施工带来不利的影响。
High geothermal in the tunnel with thick overburden is unfavorable for tunnel construction.
海底隧道深埋于海水以下，因而在勘探、设计、施工和运行方面都比陆地隧道更困难。
Therefore, they are more difficult in geological investigation, design, construction and operation than land tunnels.
海底隧道深埋于海水以下，因而在勘探、设计、施工和运行方面都比陆地隧道更困难。
Therefore, they are more difficult in geological investigation, design, construction and operation than land tunnels.
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