Upper Bound Solution of Surrounding Rock Pressure for Deep Cavity Using Nonlinear Hoek–Brown Failure Criterion

Table 2

Upper bound solution of the surrounding rock pressure e at different and .

	e (kPa)
	K = 0.4	K = 0.6	K = 0.8	K = 1.0	K = 1.2	K = 1.4
16	44.8	50.4	53.8	56.1	57.8	59.1
18	61.5	69.4	74.2	77.6	80.0	81.8
20	80.7	91.4	98.0	102.5	105.7	108.2
22	102.3	116.2	124.8	130.7	135.0	138.3
24	126.2	143.7	154.6	162.1	167.6	171.8
26	152.3	173.9	187.5	196.8	203.6	208.8