竖井开挖采用了临时混凝士衬砌护壁措施。
The temporary concrete lining guard wall method was used in excavating vertical shaft.
水电工程竖井特别是高竖井开挖，主要难点体现在竖井导井开挖的速度上。
The excavation speed of pilot shaft is one of the key difficulties for the excavation of shaft, high ones in special, of hydropower works.
在竖井的开挖过程中，不可避免的出现变形与稳定性问题。
In process of shaft's excavation, the problem of transformation and stability is unavoidable.
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