陡倾角、大直径、长斜井开挖施工难度大、危险程度高。
The excavation of long shaft under high dip Angle and large diameter has a big difficulty and a high risk.
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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