关键词: 大断面巷道, 主应力差, 非均匀变形破坏, 补强支护

Abstract: Aiming at the problem of uneven large deformation and failure of support failure of slabs in the large section roadway caused by bottom pull in the 3309 transportation lane of Sangshuping No. 2 Well, the method of numerical simulation was used to study the surrounding rock of the roadway during mining. The change characteristics of the principal stress difference reveals the non-uniform deformation mechanism of the surrounding rock in the large section of the double-lane working face. The results show that: (1) The peak stress of coal pillar slab during primary mining is 7.93MPa higher than that of coal wall. During secondary mining, the peak stress of coal pillar slab is 12.96MPa higher than that of coal wall. The gang is deformed asymmetrically. (2) During the second mining period, the main stress difference of the 3309 transportation lane coal pillar sill increased by 11.46MPa and the stress concentration factor increased by 1.63 compared to the primary mining period. Compared with the coal wall during one mining period, the principal stress difference increased by 27.46MPa, and the stress concentration factor increased by 3.92. The surrounding rock as a whole was in a state of high shear stress, and the deformation and damage were serious. (3) The use of ?32×2500mm self-tapping bolts for the main side of the 3309 transportation lane, and the use of ?32×3500mm self-tapping bolts for reinforcement and support for the secondary side can achieve a good surrounding rock control effect.