Wedge Instability Model Improvement of Shield Tunnel Excavation Face under Inclined Surface

Table 2

Parameters of the section.

Strata parameter	H (m)	C (m)	Inclined surface angle α (°)	Equilibrium limit support pressure (kPa)	FEM limit support pressure (kPa)	Rankine Earth pressure [23] (kPa)	Coulomb Earth pressure [23] (kPa)
I-zk2890	53	10	0	682	691	705	705
II-zk2840	53	10	27	718	723	705	731