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、长斜井开挖施工难度大、危险程度高。
Because construction circumstances of high dip Angle and long inclined shaft was special, the construction was difficult and there were many insecurity factors.
陡倾角长斜井施工由于施工环境特殊，施工难度大，存在诸多不安全因素。
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