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

Table 1

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

	q (kPa)
	K = 0.4	K = 0.6	K = 0.8	K = 1.0	K = 1.2	K = 1.4
16	112.1	84.0	67.2	56.1	48.2	42.2
18	153.9	115.7	92.8	77.6	66.6	58.4
20	201.9	152.3	122.5	102.5	88.1	77.3
22	255.8	193.6	156.0	130.7	112.5	98.8
24	315.5	239.5	193.3	162.1	139.7	122.7
26	380.9	289.9	234.3	196.8	169.6	149.1