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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 reasonably reserve safe coal and rock pillars, based on the stratified mining face of 5303 shallow seam, the height of the first stratification and the height of the two strata of the working face are measured. Respectively 11.4,24.2 m. Based on this, the “two” and “three zones” heights of the second and third strata are predicted using “” three times “mining rules ” and the Yanzhou mining experience formula, and verified by numerical simulation , The predicted height of the second stratified collapse zone and the water-conducting fracture zone is 12.2-15.3 m, 38.2-42.9 m, and the predicted height of the third stratified collapse zone and the water-conducting fracture zone is 14.4-16.3 m, 39.0 ~ 43.8 m. The prediction results can provide a basis for the rational reservation of coal and rock pillars under similar geological conditions.