The Influence Mechanism of In Situ Stress State on the Stability of Deep-Buried-Curved Tunnel in Qinghai-Tibet Plateau and Its Adjacent Region

Table 2

Cases for simulation conditions.

KH		φ
		Angle between the maximum horizontal principal stress orientation and tunnel axis (°)
		0°	10°	20°	30°	40°	50°	60°	70°	80°	90°
Lateral pressure coefficient	0.5	√	√	√	√	√	√	√	√	√	√
	1	√	√	√	√	√	√	√	√	√	√
	1.5	√	√	√	√	√	√	√	√	√	√
	2	√	√	√	√	√	√	√	√	√	√
	2.5	√	√	√	√	√	√	√	√	√	√