Study on narrow coal pillar supporting technology of gob side entry in medium and thick coal seam
Zhang Shiling1,2
1. National Key Lab of Gas Disaster Monitoring &Control and Emergency Technology， Chongqing 400037 China；
2. China Coal Technology Engineering Group Chongqing Research Institute，Chongqing 400039, China
In order to improve the recovery rate of coal resources and the maintenance effect of roadways and reduce the cost of support, the theoretical foundation and design method of bolt support along the roadway of Licun Mine were optimized according to the engineering geology. The pretension of the anchor rod was determined to be in the range of 25 ~ 40 kN, and the supporting strength of the roadway anchor rod was 0.2～0.3 MPa. Industrial tests showed that the maximum approaching distance of the two sides along the empty roadway was 120 mm, the maximum sinking amount of the roof 21 mm, and the maximum approaching distance of the left side 58 mm. The deformation of the surrounding rock was effectively controlled; Below the yield load, there was no bolt broken due to excessive force. The bolt support effectively controlled the deformation of the surrounding rock and played a good supporting role.
张士岭1,2. 中厚煤层沿空掘巷窄煤柱支护技术研究[J]. 煤炭与化工, 2020, 43(8): 15-17,116.
Zhang Shiling1,2. Study on narrow coal pillar supporting technology of gob side entry in medium and thick coal seam. CCI, 2020, 43(8): 15-17,116.
