Analysis of Crustal Stress and Its Influence on the Stability of the Deep Tunnel in the Huanaote Mining Area

Table 6

Mining stress and deformation of surrounding rock under different working conditions.

	Horizontal displacement of two side walls (mm)	Roof displacement (mm)	Roof displacement at 1 m depth (mm)	Maximum stress of two side walls (MPa)	Maximum stress of roof (MPa)
Conditions 1	26	30	24	17	30
Conditions 2	45	34	31	13.4	35
Conditions 3	35	32	28	27	24.5

Conditions 1: the axial direction of tunnel is consistent with the direction of maximum principal stress; Conditions 2: axial direction of tunnel perpendicular to direction of maximum principal stress; Conditions 3: the actual heading direction of tunnel intersects with the direction of maximum principal stress.