隧道进口被高涨的海水淹没了。
The tunnel entrance was submerged by rising sea whcommerciingr.
软岩地区浅埋偏压大跨度隧道进口段极易塌方。
It is easily collapsed for shallow and unsymmetrical large-span tunnel near portal in soft rock.
该四大问题集中于隧道进口端，致使隧道施工难度及风险性大大增加。
The four main issues focused on the entrance of the tunnel, which made the tunnel construction difficult and the risk increased greatly.
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