Study on the Influence of Tectonic Stress on Stability of Horseshoe-Shaped Tunnels

Table 1

Parameters of calculation model.

Cohesion C (MPa)	Frictional angle θ (°)	Elastic modulus E (MPa)	Poisson’s ratio μ	Vertical stress P (MPa)	Horizontal stress Q (MPa)
1.5	36	10000	0.25	40	20