"井筒支护" can be translated into English as "shaft lining support" or "shaft support".
"Shaft lining support" specifically refers to the support structure for the lining of a mine shaft, emphasizing the protection and reinforcement of the shaft's inner wall.
"Shaft support" is a more general term that can encompass various types of support structures for a mine shaft, including but not limited to the lining support.
In the context of mining engineering, both terms are commonly used, with "shaft lining support" being more precise when referring to the lining-specific support.