隧道不渗不漏衬砌施工技术研究。
Do research on tunnel lining with no seepage and no leakage.
陡倾角大直径长斜井混凝土衬砌施工技术复杂，施工难度大。
Construction technique of concrete lining of long inclined shaft with steep obliquity Angle and large diameter is complex and extremely difficult.
陡倾角大直径长斜井混凝土衬砌施工技术复杂，施工难度特别大。
For concrete lining construction of long inclined shaft with steep obliquity and big diameter, the construction technology is complex and difficult.
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