深部厚煤层条带开采煤柱的稳定性

Coal pillar stability of deep and high seam strip-partial mining

通过对三向应力状态下的煤柱极限强度计算公式分析得出:我国目前普遍应用的A.H.威尔逊计算理论公式存在因简化带来的问题,并且随着采深的增大,问题表现的越明显.理论分析表明,煤柱塑性区宽度不仅与采深、采厚有关,而且也同采出率有关.结合古城煤矿的实际情况,利用FLAC3D模拟得出了不同开采条件下煤柱塑性区宽度,通过二元线性回归分析,得出了煤柱塑性区宽度与采深、采厚及采出率的计算公式.最后给出了在深部厚煤层条带开采情况下煤柱极限载荷的计算公式.

A conclusion that A. H. Wilson simplified calculation formulation for coal pillar used widely in our country exists some limitations was induced by analysis calculation formulation that limit strength of coal pillar under triaxial stresses at present, and with the increase of mining depth, the problem was pefformanced more obvious. Theoretical analysis shows that coal pillar＇ s plastic zone width not only with mining depth, mining height, but with the recovery rate. Combined with the actual situation in Gucheng Coal Mine, using FLAC^3D obtained coal pillar＇ s plastic zone width that under different conditions for mining, through binary linear regression analysis, obtained the calculation formula of plastic zone width that is about mining depth, mining height and mining recovery rate. Finally, calculation formula of limit load of strip-partial coal pillar under the conditions of deep and high seam strip-partial mining was given.