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根据煤柱载荷的受力方式,分析了不同煤柱宽度下底板应力场的传播分布形式。结合UDEC数值模拟分析了煤层一侧开采和20m煤柱下的应力系数分布情况,对比分析了不同压力系数位置开挖巷道前后的应力变化。结果表明,煤柱压力传递角介于-50°~18°;煤柱底板压力系数与底板距离基本成线性关系,随距离增加而不断衰减,同时煤柱底板的影响深度与煤柱的倍数深度呈三次多项式递减;煤柱底板压力系数的拟合关系式简洁、精度高,可方便计算煤柱下任一点的压力系数,为巷道位置和支护方式的选择提供了一定的指导依据。
According to the stress mode of coal column load, the distribution of stress distribution in floor under different coal pillar width is analyzed. Combined with UDEC numerical simulation, the distribution of stress coefficient under one coal seam and 20m coal pillar is analyzed. The stress changes before and after excavation with different pressure coefficient are analyzed. The results show that the pressure transmission angle of the coal pillar is between -50 ° and 18 °. The pressure coefficient of the coal floor is basically linear with the distance between the floor and it decays continuously with the distance increasing. Meanwhile, Which is cubic polynomial decreasing. The fitting formula of coal floor pressure coefficient is simple and high precision, which can easily calculate the pressure coefficient at any point under the coal pillar, which provides some guidance for the choice of roadway location and support mode.