孤岛煤柱下巷道布置位置研究
Study on Layout of Roadway Position Under Island Coal Pillar
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摘要: 基于上覆岩层空间结构，并且依据3上煤柱两侧不同的采动情况，分析了煤柱上覆岩层分布特征和应力传递规律，估算了其静态平均支承应力大小；其次采用弹性力学方法，分析计算了煤柱下部煤岩应力场函数；最后基于冲击地压发生理论和采掘实践，提出了应力为指标的孤岛煤柱下掘进巷道位置判别公式。通过理论分析、现场矿压观测等手段初步得到3下510运输巷错开煤柱的距离大于5 m，并根据冲击地压防治原则和利于资源回收原则，最终确定了3下510运输巷位置（错开煤柱的距离约7 m）。现场实施效果良好，并且验证了孤岛煤柱下巷道布置方法的合理性。Abstract: Based on the overlying strata spatial structure and the different mining conditions of both sides of No.3 upper coal pillar, distribution features of coal pillar overburden and stress transfer laws were analyzed; the static bearing stress of the coal pillar on average size was estimated. Secondly, the lower coal and rock stress field function under coal pillar is analyzed and calculated by using elastic mechanics method. Finally, based on the genetic theory and mining practice of rock burst, excavation roadway position discriminant formula under the island coal pillar taking stress as indicators was proposed. Through theoretical analysis, mine pressure observation methods and so on, distance between mining transport lane of No.3 lower 510 working face and coal pillar needs separation distance more than 5 m was initially concluded, and according to the principle of prevention and control of rock burst and conducive to resource recycling, location of mining transport lane of No.3 lower 510 working face was determined (separation distance of coal pillar was about 7 m). The effect is good, and the rationality of the method about roadway layout under the island coal pillar was verified.
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