残留煤柱沿空掘巷围岩应力场及位移场分布

Stress Field and Displacement Field of Gob- side Entry Driving Surrounding Rock in Residual Pillar

采用数值计算的方法研究了巷道开挖前残留煤柱初始应力场、位移场分布规律,揭示了窄煤柱宽度对残留煤柱应力场和位移场的影响规律。结果表明:随着窄煤柱宽度的增加,垂直应力、水平应力峰值均向实体煤深部转移,垂直位移、水平位移影响区域呈递增趋势,残留煤柱中部稳定区域呈递减趋势,当窄煤柱宽度≥6 m时,窄煤柱内存在弹性核区,有利于窄煤柱稳定。

In this paper,the method of numerical calculation is used to study the distribution of the original stress field and displacement field before the excavation. In the meanwhile,we revealed the influence of the narrow coal pillar width on the stress field and displacement field in the residual pillar. The results show that the peak value of the vertical and horizontal stress will transfer to the deep of the coal mass,the influence range of the vertical and horizontal displacement will increase,and the stable region of the residual pillar will decrease with the increase of the narrow coal pillar. In addition,the narrow coal pillar will be more stable when the width reaches 6 meters with elastic core region.