“二衬”是坑道施工中的一个术语。在坑道开挖时沿着掌子面向前开进，而其后已挖成的坑道四面则需要加固。“二衬”即是指经加固后的坑道四周仍需继续二次加固来做的工作。
实测二衬围岩压力荷载分担比例与规范基本相符。
The load sharing ratio of the secondary lining is consistent with the code.
隧道二衬开裂是目前隧道工程中经常出现的病害，严重影响工程质量和交通安全。
Second lining of tunnel cracks is one of the most frequent diseases in the highway tunnel construction, which adversely impacts the project quality as well as traffic safety.
④对于浅埋大断面大跨度连拱隧道，应及早施作二衬，封闭成环，以改善结构受力。
The secondary support structure and the enclosing of the lining must be established in time to improve the performance of the lining.
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