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无论是上行还是下行开采煤层群,为确保其上部采准巷道生产的安全使用,对此类巷道位置的选择具有很大的现实意义。下部煤层的回采,在任何情况下都会对上部新布置的和已有的巷道的稳固性产生重要影响。由于布置巷道位置的不同,回采对巷道的影响也将不同。在一般情况下,在采动岩层中回采工作的影响区域具有如图所示的形式,图中数码Ⅰ为压力升高区,这种压力从煤壁向未采动
No matter whether it is the coal seam group mining up or down, in order to ensure the safe use of the upper part of the quasi-laneway production, the choice of such laneway location has great practical significance. The mining of the lower coal seams will in any case have a major impact on the stability of newly arranged and existing tunnels in the upper part. The impact of mining on the roadway will also be different due to the different location of the roadway. In general, the area of influence of the mining operation in the mining rock has the form shown in the figure. In the figure, numeral I is the area of pressure increase, which is from the coal wall to the non-mining