关键词: 沿空掘巷, 煤柱尺寸, 回采动压, 围岩控制, 非对称支护

Abstract: Based on the engineering background of gob side entry driving with narrow coal pillar in 487 working face of Hengyuan coal mine, the optimal roadway pillar width of tailgate in 487 working face is determined to be 5 m by means of theoretical calculation and numerical simulation. Based on numerical simulation, the stress distribution, surrounding rock deformation and plastic zone evolution characteristics of roof, solid coal and coal pillar in advance roadway after mining in 487 working face are analyzed. The high strength bolt and cable combination asymmetrical support technology is proposed individually, and the rationality of roadway support stress field is analyzed. The engineering practice shows that: under the influence of mining dynamic pressure the surrounding rock of gob side entry is disturbed severely by the working face existing within 30m of the advance working face. The maximum displacement of roof and floor and two sides are 574 mm and 759 mm respectively. The deformation of roadway surrounding rock tends to be stable after 30 m ahead of working face, the average displacement of roof to floor and two sides are 190 mm and 315 mm separately, which means 5 m coal pillar and bolt-cable combination asymmetric support technology effectively control the surrounding rock deformation of gob-side entry driving