This paper introduces excavation of the unfavorable geological section of tunnel project of Wanjiazhai YRDP, temporary brace and construction of concrete lining.
文中介绍了万家寨引黄隧洞工程不良地质洞段施工中的开挖，临时支护，混凝土衬砌等。
The initial section of tunnel had to be dug by hand.
隧道的起始部份不得不人工挖掘。
The initial section of tunnel had to be dug by hand.
隧道的起始部份不得不人工挖掘。
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