摘要:
针对崖窑峁煤矿30103工作面保护煤柱过宽导致资源浪费这一问题，通过现场勘探、理论分析、数值模拟及现场监测的研究方法，建立了煤柱宽度计算模型，揭示了在6、8、10、12、15 m不同宽度的煤柱下应力、位移分布规律及塑性区特征，并确定了煤柱的合理留设宽度，利用钻孔窥视仪在现场进行监测并对比分析。研究结果表明：崖窑峁煤矿留设宽15、12 m保护煤柱时由于宽度较大，中间有大量未破坏区域，造成资源浪费；留设6、8 m保护煤柱时塑性区完全贯通，承载性能差，破坏严重；护巷煤柱宽度为10 m时，煤柱塑性区恰处于贯通或未贯通区间，煤柱内部具有一定的弹性核区域，并略高于理论计算的煤柱宽度范围9.55 m。通过对15 m和10 m的煤柱进行现场钻孔监测，发现无论15 m煤柱还是10 m煤柱是否受采动影响，煤柱内裂隙发育和扩展的影响不大，煤柱内存在一定范围未破坏区域，煤柱具有一定的完整性和稳定性。该研究成果为其他类似条件下矿井提供可参考的有效数据。
Abstract:
Aiming at the problem of resource waste caused by too large protective coal pillar in No.30103 working face of Yayaomao Coal Mine, a calculation model of coal pillar width was established by means of field exploration, theoretical analysis, numerical simulation and field monitoring. This paper revealed the distribution law of stress and displacement and the characteristics of plastic zone under the coal pillars with different widths of 6 m, 8 m, 10 m,12 m and 15 m, and determined the reasonable reserved width of the coal pillar. The borehole peeper was used for monitoring and comparative analysis in the field. The research results show that: when the 15 and 12 m protective coal pillars are left in the Yayaomao Coal Mine, the width is large, and there are a large number of undamaged areas in the middle, resulting in a waste of resources; when 6 m and 8 m protective coal pillars are set, the plastic area is completely through, the bearing capacity is poor, and the damage is serious; when the width of protective coal pillars is 10 m, the coal pillar plastic zone is just in the penetration or non-penetration interval, and there is a certain elastic core area inside the coal pillar, which is slightly higher than the theoretically calculated coal pillar width range of 9.55 m. Through on-site drilling monitoring of 15 m and 10 m coal pillars, it is found that whether the 15 m coal pillar or 10 m coal pillar is affected by mining, the development and expansion of cracks in the coal pillar have little effect, there is a certain range of undamaged area in the coal pillar, and the coal pillar has a certain degree of integrity and stability. The research results provide effective data for other mines under similar conditions.
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