目前，天井的掘进方法，主要采用钻爆法。

At present, drilling and blasting method is mainly used in the shaft excavation.

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大约85%的管道将兴建利用软地面掘进方法，而其余的将使用常规明挖施工方法。

Approximately 85% of the pipeline will be constructed using soft-ground tunneling methods and the remainder will be constructed using conventional open-cut methods.

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全断面钻爆法适用于围岩坚固稳定，采用钻孔爆破方法将洞室开挖断面一次性开挖成型的地下建筑工程洞室开挖掘进方法。

The whole section explosion method which is the one for underground construction digging, suitable for stable and strong dam, form a section for one time by drilling explosion.

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