Physical Modeling of a Shallow-Buried Metro Tunnel in the Soft Loess Layer Using Similarity Theory

Table 5

Stress release of surrounding rock under different construction methods.

Working condition	Condition 1	Condition 2	Condition 3	Condition 4	Condition 5	Condition 6
Final stress/initial stress	3.69	7.36	4.40	4.13	5.52	4.11