含水松散层下厚煤层采掘溃砂危险性分析

针对含水松散层下厚煤层采掘溃砂工程难点,对含水松散层的岩性、厚度和富水性等水文地质条件进行研究,探讨了厚煤层分层开采留设安全煤岩柱合理尺寸,并确定了相应的开采方法;预计了(垮落带和导水裂隙带)"两带"高度,基于GIS的强大数据处理功能,对多因素引起的采动溃砂危险性进行了量化评价,分析得出了分层开采条件下顶板溃砂危险性分区图。

Sand Inrush Hazard Analysis of Thick Coal Seam Mining Under Water-bearing Unconsolidated Strata

For the projects difficulties of sand inrush of thick coal seam mining under water-bearing unconsolidated strata,the paper carries out scientific analysis of hydro-geological conditions,including the lithology,thickness,and water yield property of water-bearing unconsolidated strata,reasonable size of leaving safety coal and rock pillars in thick seam slicing mining is discussed and the corresponding mining methods are decided.On the basis,the heights of caving zone and water conducted zone were predicted,mining method was decided.Based on the powerful data processing capabilities of GIS,the risk of sand inrush caused by multiple factors are analyzed quantitatively,and sand inrush risk zoning map was also drew eventually.