Deformation Response and Safety Evaluation of Buildings Affected by Subway-Station Construction

Table 4

Main excavated conditions of the foundation pit.

Construction step	Construction content	Excavation depth
I	Initial ground stress	—
II	Retaining structure construction	—
III	Excavate the first layer of soil and set up the first steel support	2 m
IV	Excavate the second layer of soil and set up the second steel support	4.5 m
V	Excavate the third layer of soil and set up the third steel support	4.5 m
VI	Excavate the fourth layer of soil and set up the fourth steel support	4.5 m
VII	Excavation to the bottom	4.5 m