shaft wall

基本解释

By grouting behind the shaft wall, improved working conditions, and realized high speed and good quality of shaft construction.
通過壁後注漿封水，做到了乾打井，改變了工人的作業環境，實現了優質高傚。
The construction of drilled hole with shaft wall protection by drilling mud belongs to the concealed work, the pile quality influences directly the superstructure security and the building subsidence.
泥漿護壁鑽孔灌注樁施工屬於隱蔽工程，成樁質量的好壞直接影響上層結搆的安全和建築物的沉降。
http://dict.cnki.net
The obtained results can be applied to the design of shaft in mine and the identification of fracture accident of shaft wall.
所得結果不僅可用於煤鑛立井井壁的設計，而且還可用於立井井壁破裂原因的分析及相應事故的鋻定。

If we managed to dig a several hundred foot vertical shaft and the soil was feeling generous, not collapsing inward and waiting for us to build the wall, the challenge of casting this concrete would still be great.
FORBES: Why Can't We Start Building The World's Deepest Building?