The Effect of Intersection Angle on the Failure Mechanism of Utility Tunnel

Table 1

Parameters of concrete damage plastic model [22].

Parameters	Value
(MPa)	40	45	50	55	60	65	70
(10^−5)	179	185	192	198	203	208	213
	1.94	2.21	2.48	2.74	3	3.25	3.5
	2	1.9	1.9	1.8	1.8	1.7	1.7