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空顶距即长壁式工作面液压支架前排立柱至煤壁的距离,确定适当的空顶距对保证安全生产具有重要意义。目前,法定的空顶距限度为2米,但在生产实践中,已逐渐打破了这一界限,越来越多的综采工作面的空顶距超过了这一限度。特别是使用掩护式支架之后,因其立柱是倾斜的,不垂直于顶梁和底座,所以给空顶距的计算带来了新问题。故此,对长壁工作面空顶距问题加以探讨是十分重要的。
The distance between the roof of the long-wall hydraulic support and the coal pillar in the front wall of the long-span hydraulic face is of great importance to ensure the safety of production. At present, the statutory free-air limit is 2 meters, but this limit has been gradually broken down in production practice. More and more empty heads of fully mechanized mining work faces exceed this limit. In particular, the use of screen brackets, because of its column is tilted, not perpendicular to the roof beam and the base, so the calculation of the distance to the roof has brought new problems. Therefore, it is very important to discuss the issue of empty roof distance of longwall face.