top picking of tunnel
... 隧道落底under cut of tunnel 隧道挑顶top picking of tunnel 隧道套拱cover arch of tunnel ...
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文章以郑西铁路客运专线函谷关隧道横洞挑顶为例，介绍了一种新型挑顶施工工艺——垂直挑顶法。
Taking the cross cave propping in Hanguguan Tunnel of passengers special line on Zhengxi railway, this paper introduces a new construction technique of propping - vertical propping method.
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