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神东煤田浅埋煤层存在大量房式遗留煤柱,受下方煤层采动影响可能突然失稳垮落,造成冲击式动力灾害,遗留煤柱稳定性对下方煤层安全开采具有重要影响。针对乌兰集团石圪台煤矿地质生产条件,基于突变理论建立了房式煤柱稳定性尖点突变模型,分析了浅埋煤层房式开采遗留煤柱突变失稳规律。结果表明煤柱发生突变失稳的必要条件为煤柱单侧屈服带宽度介于煤柱宽度的0.33~0.43倍时将发生突变失稳,现场观测验证了计算结果。
There are a large number of residual coal pillars in the shallow coal seam of Shendong coalfield. Due to the influence of coal mining in the lower coal seam, it may suddenly collapse and collapse, resulting in impact dynamic disasters. The stability of the remaining coal pillars has an important influence on the safe mining of coal seam below. Aiming at the geological production conditions of Shilantai Coal Mine in Wulan Group, a cusp catastrophe model of the stability of the coal pillar in the chamber was established based on the catastrophe theory, and the law of catastrophic failure of the coal pillar in the shallow coal seam mining was analyzed. The results show that the necessary conditions for sudden failure of coal pillars are that the unilateral yield zone width of coal pillars will fluctuate from 0.33 to 0.43 times of the coal pillar width, and the field test results show the calculated results.