浅埋煤层分层开采“两带”高度预测

Height Prediction of the "Two Zones" in Shallow Coal Seam by Slicing Ming

为了合理留设安全煤岩柱,以5303浅埋煤层分层开采工作面为背景,对工作面第一分层"两带"高度进行实测,得出垮落带和导水裂缝带高度分别为11.4,24.2 m。以此为基础,采用《"三下"开采规程》和兖州矿区经验公式对第二分层及第三分层的"两带"高度进行预测,结合数值模拟方法对其进行验证,综合得出第二分层垮落带和导水裂缝带预测高度为12.2~15.3 m、38.2~42.9 m,第三分层垮落带和导水裂缝带预测高度为14.4~16.3 m、39.0~43.8 m。预测结果可为类似地质条件下的河下开采的煤岩柱合理留设提供依据。

In order to set safe pillars for coal and rock rationally,the 5303 working face by slicing mining in shallow seam was taken as the background. The heights of caving zone and water flowing fractured zone on the first layer were respectively measured as 11. 4 and 24. 2 meters. On this basis,mining regulations under three circumstances and the empirical formula of Yanzhou Mine were used to predict the height of ' two zone' on the second and the third layers. Combined with numerical simulation,the results were verified. The predicted heights of the caving zone and water flowing fractured zone were 12. 2 ~ 15. 3 meters and 38. 2 ~ 42. 9 meters on the second layer,while 14. 4 ~16. 3 meters and 39. 0 ~ 43. 8 meters on the third layer. The predicted results can provide a reference for designing reasonable coal and rock pillars in coal mining under similar geological conditions.