High Dimension Model Representation-Based Response Surface for Reliability Analysis of Tunnel

Table 3

Reliability comparison of plastic zone in different support pressures.

pi(MPa)	HDMR				FORM
	Reliability index	Design point			Reliability index	Design point
		E/MPa	c/MPa	φ/°		E/MPa	c/MPa	φ/°
0.1	1.5313	372.9700	0.1310	23.2682	1.5294	373.0000	0.1328	23.1687
0.15	1.9525	373.0034	0.1042	23.3512	1.9500	373.0000	0.1067	23.2211
0.2	2.3759	373.0990	0.0773	23.4380	2.3720	373.0000	0.0810	23.2569
0.25	2.8002	373.0490	0.0508	23.5009	2.7952	373.0000	0.0555	23.2758