远距离下保护层开采影响保护效果的因素分析

Analysis on Protective Effect Factors Influenced by Mining in Protective Seam Under Long Distance to Other Seam

远距离下保护层开采中,影响被保护层保护效果的因素甚多,文中运用计算机数值模拟的方法,分析关键层在覆岩中的位置、工作面长度、煤层倾角、开采煤层的厚度对远距离下保护层开采时被保护煤层的保护效果,通过分析这四种因素,对远距离下保护层开采被保护层的应力分布、垂直位移、煤层膨胀变形的规律进行研究。结果表明,关键层所处的位置越靠近保护煤层、工作面的长度越长,煤层倾角越小、开采煤层的厚度越厚,被保护煤层的保护效果越好。

During the mining in the protective seam under a long distance to above seam, there were many factors affected to the protection effects of the protected seam. With the computer numerical simulation method, the paper analyzed the protection effects of the location of the key stratum in the overburden strata, the coal mining face length, seam inclination, the thickness of the mining seam to the protected seam during the mining in the protective seam under the long distance to the above seam. With the analysis on the above four factors, the paper studied the mining operations in the protective seam under the long distance to above seam affected to the stress distribution, vertical displacement, seam swelling deformation law of the protected seam. The results showed that the location of the key stratum more closed to the protective seam, the longer length of the coal mining face, the smaller inclination of the seam, the high thickness of the mining seam, the better protective effect of the protected seam would be.