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在煤矿建设和生产过程中,经常遇到防水煤柱的留设问题。在处理这个问题时,探求最合理的煤柱尺寸,有着十分重要的意义。为此,本文就倾斜煤层(或巷道)直接与强含水层接触时,防水煤柱尺寸的确定方法作一探讨,不当之处,欢迎批评、指正。 断层使煤层和强含水层接近(如图1),煤柱除受承压水的顺层压力引起破坏外,还可能因煤柱宽度太小,在水压力和矿山压力作用下使采空区或巷道底板发生底鼓而突水,造成煤柱失效。在这种情况下计算煤柱尺寸应从以下两个方面考虑: (1)先考虑煤柱本身不因顺层水压力而遭受破坏所需的煤柱宽度a,a可以从下式求得:
In the process of construction and production of coal mines, the problems of leaving pillars of waterproofing are often encountered. In dealing with this issue, to explore the most reasonable pillars size, has a very important significance. Therefore, in this paper, when the inclined coal seam (or roadway) is in direct contact with strong aquifer, the method of determining the size of waterproof coal pillars is discussed, and the improper place is welcome to criticize and correct. Faults make the coal seam and strong aquifers close (Figure 1). In addition to being damaged by the bedding pressure of the confined water, the coal pillar may be too small in width due to the pressure of water and the pressure of the mine to make the gob area Or the bottom of the tunnel bottom drum and water inrush, resulting in failure of coal pillars. Calculating the coal pillar size in this case should be considered in two ways: (1) The pillar width a, a, which is required to first consider the pillar itself not to be damaged by the water pressure in the bedding water, can be obtained from the following formula: