Reasonable width of coal pillar and asymmetric support technology in gob-side entry

Abstract

Taking 9102 working face of Changheng Coal Mine as the engineering background, the reasonable width of 9102 narrow coal pillar is determined to be 9 m by integrating the theoretical calculation results, numerical simulation results and the field measurement results of pillar supporting pressure; the asymmetric control technology of anchor truss can effectively control the asymmetric deformation and damage of roof in gob-side entry driving. The field macroscopic ground pressure observation results show that the displacement of roof, pillar side and solid coal side is less deformed during mining, the roadway control effect is good, and the mining safety is effectively guaranteed.

Keywords

• gob-side roadway
• narrow coal pillar
• cusp mutation
• anchor cable truss
• asymmetric support