Experimental Study on Structural Form and Excavation Model of Urban Metro Cross Transfer Station with Super Large Cross Section and Shallow Excavation

Table 4

Principal stress of key points (kPa).

Measure point		Left wall foot	Left flank wall	Left arch foot	Left arch waist	Vault
Double-side-wall heading excavation method	σ1	−1,717.93	544.55	194.55	279.42	758.21
	σ3	−2,670.02	−1,447.14	−1,066.89	−1,060.74	−95.19
Cross rock beam + heading method	σ1	−1,208.40	157.54	132.31	175.28	291.57
	σ3	−1,355.68	−527.37	−755.94	−354.49	−375.30