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在文献〔1〕中指出,在水平和缓斜煤层条件下开采下解放层时,层间岩层中形成的透过瓦斯通道的截面面积,一般来说可由下式确定:
In [1], it is pointed out that the cross-sectional area of the gas passage formed in an inter-strata formation when mining a lower-level release rock in horizontal and gently-inclined coal seams is generally determined by the following formula: