松散细砂岩顶板下综采合理放煤步距的确定

Rational coal caving step distance setting for fully mechanized longwall top coal caving face under soft fine sandstone roof

针对厚煤层顶板存在松散细砂岩的煤层条件,依据相似理论,采用散体相似模型试验的方法,分析了不同顶煤块度下不同放煤步距对煤矸砂流动形态及混矸的影响规律,给出了不同煤矸块度条件下的放煤步距选取原则。研究结果表明,采用三采一放有利于控制顶板中的松散细砂岩,降低放出顶煤中的含砂量。

According to the thick seam conditions with fine sandstone in the roof, the paper analyzed th einflunce law of the different coal caving step distance under different lump coal from the top coal to the coal and refuse flow form and coal and refuse mixed and provided the principle to select the coal caving step distance under the different coal and refuse sizes with the simulated theory and the test method of the bulk simulated model. The research results showed that the three coal mining operations and one caving operation would be favorable to control the fine sandstone in the roof and could reduce the sand content in the coal from the caving.