泾河下综放开采隔离煤柱对覆岩破坏控制作用的物理模拟

根据地质资料,分析了下沟煤矿泾河下特厚煤层大面积综放开采的地质特点,为实现水体下安全回采,确定了在各工作面间留设一定宽度隔离煤柱的开采方案。通过相似材料模拟试验,分析了改本区地质条件下各综放工作面间留设一定宽度隔离煤柱对覆岩破坏的影响。研究证实,隔离煤柱对覆岩破坏起到有效的控制作用。根据试验得出的单工作面最大裂采比,通过最小防水安全煤岩柱垂高的计算,认为地质条件满足泾河下安全回采的要求。且研究成果成功指导了5个工作面安全回采,可为该区及类似条件其他矿井的开采提供参考。

Physical simulation of isolated pillar controlling role to overlying strata failure in conditions of fully-mechanized top-coal caving mining under Jing River

According to geological material, analysis of geological features of great thick coal seam massive fully-mechanized top-coal caving mining under the Jing River in Xiagou coal mine, in order to achieve mining safety under the water, it is determined the mining plan that remained the isolated pillar with a definite width between the work faces. By similar material tests, analysis of the isolated pillar with a definite width to have an effect on overlying strata failure under geological conditions in the area; the achieved results prove that the isolated pillar can effectively control overlying strata failure. The test results provide the largest ratio of fissure zone height and mining thickness of single work face, and by the least vertical height calculating of the safe coal post preventing water, hold that geological conditions meet the requirements of the safe stoping. Research results successfully guided the safety stoping of the five work face; it will provide references to those mines with similar conditions in Xiagou mine area.