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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。
The numerical calculation method was used to study the distribution of initial stress field and displacement field of residual coal pillar before excavation. The influence of width of narrow coal pillar on stress field and displacement field of residual coal pillar was revealed. The results show that with the increase of the width of narrow pillars, the vertical stress and horizontal stress peak are all transferred to the deep part of solid coal. The vertical displacement and horizontal displacement influence the area is increasing, the stability of the middle of the residual pits shows a decreasing trend, When the width is more than or equal to 6m, there exists elastic core in the narrow coal pillar, which is beneficial to the stability of narrow coal pillar.