Numerical Tests Research on Mechanical Parameters of Rockmass considering Structural Plane Combination Characteristics

Table 2

Numerical simulation results of fracture stress values of rockmass with different structure plane combinations.

Confining pressure (MPa)	0°	15°	30°	45°	60°	75°	90°
Fracture stress values under the condition of combination structural surface −30° (MPa)
1.5	25.30	23.80	23.10	6.78	6.71	18.40	28.40
2.5	33.00	30.40	29.80	10.70	10.40	24.80	36.80
3.5	40.10	37.10	36.60	14.60	14.20	30.90	44.90
Cohesion (MPa)	2.63	2.68	2.49	0.23	0.28	1.82	2.80
Internal friction angle (°)	49.63	47.61	47.90	36.25	35.35	46.40	51.61
Fracture stress values under the condition of combination structural surface −45° (MPa)
1.5	6.73	6.67	6.55	6.70	6.69	6.79	6.62
2.5	10.60	10.50	10.40	10.50	10.60	10.60	10.50
3.5	14.50	14.40	14.30	14.50	14.20	14.50	14.40
Cohesion (MPa)	0.23	0.22	0.19	0.21	0.29	0.25	0.20
Internal friction angle (°)	36.20	36.08	36.14	36.29	35.41	36.02	36.23
Fracture stress values under the condition of combination structural surface −60° (MPa)
1.5	6.50	6.69	7.47	6.89	6.60	7.00	6.01
2.5	9.96	10.20	11.20	10.50	10.50	10.90	9.40
3.5	13.60	13.90	14.80	14.10	13.90	14.80	12.80
Cohesion (MPa)	0.30	0.33	0.52	0.39	0.32	0.29	0.25
Internal friction angle (°)	34.09	34.45	34.84	34.45	34.74	36.29	33.02