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中文摘要：
利用数值模拟，对不同围岩等级下的仰拱设置进行了研究，结果表明在小净距隧道边墙下部为整体性好的Ⅲ级围岩时，不设置仰拱对围岩的稳定性和初衬、二衬的受力影响并不大，因此可以取消仰拱的设置，简化设计与施工．
英文摘要：
In this paper, the settings on the invert of tunnel in the different levels surrounding rock have been researched by numerical simulation. The results show that when the bottom of the culvert wall of the small spacing tunnels is the overall good Ⅲ-surrounding rock, the surrounding rock stability and the force of the lining and support are not significantly affected without invert, so the invert can be cancel to simplify the design and construction.
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