松软厚煤层大采高仰采工作面煤壁片帮机理研究

摘要

According to problem that the rib spalling easy occurred in the coal wall of the rise mining face of soft thick seam,in order to re-veal the spalling mechanism of the coal wall in the high inclined rise mining face in soft thick seam and to have an effective method to pre-vent the spalling,an analytical method was applied to analyze the spalling mechanics mechanism of the coal wall in the high inclined rise coal mining face in soft thick seam.The numerical simulation method was applied to study the rise mining angle and the mining height af-fected to the coal wall spalling.The study showed that with the rise mining angle of the seam increaseing,the shearing failure of the coal wall would be occurred and thus the probability of the spalling occurred would be increased.Under the certain geological conditions,when the seam angle was over 10°,the spalling would be more serious.When the rise mining angle was in a certain condition,with the cutting height increased,the spalling depth would be increased.The rational cutting height had a critical value,when the cutting height was over the critical cutting height,the inner failure depth of the coal wall would be rapidly increased with the cutting height increased.%针对松软厚煤层仰采工作面煤壁易于片帮的问题，为揭示松软厚煤层大倾角仰采工作面煤壁片帮机理，并提出有效防止煤壁片帮方法，采用解析方法分析了松软厚煤层大倾角仰采工作面煤壁片帮力学机制，并通过数值模拟方法研究了仰采角度和采高对煤壁片帮的影响。研究结果表明：随着煤层仰采角度增大，煤壁发生剪切破坏进而导致片帮概率增大，在一定地质条件下，煤层倾角超过10°后片帮变得十分严重；在仰采角度一定的条件下，随着采高增加，片帮深度增加，但合理采高有一临界值，超过临界采高时，煤壁内部的破坏深度会随着采高的增加而急剧增大。