上行开采上部煤层合理巷道位置选择研究

Study on reasonable roadway position of upper coal seam in upward mining

根据淮北朱仙庄煤矿Ⅱ5采区8煤解突要求,采用开采10煤作为下保护层的上行开采方法。数值模拟表明,Ⅱ1051工作面开采过程中,在工作面上覆岩层中形成由高应力束构成的应力壳。在回采之初,应力壳形成较为完整,同时上方壳体应力集中程度较高,随工作面向前推进,应力壳范围逐步向上发展,壳高最大约111.4m,受应力壳作用,在应力壳内部受应力壳保护的低应力区不断变大,同时壳体应力集中程度减弱。综合数值模拟与相似模拟实验得出8煤回采巷道和底板巷道应分别布置于应力壳保护内和8煤底板约14m处,此处巷道围岩应力集中程度最低,破坏范围最小,巷道最为稳定,利于8煤的安全回采。

According to the Ⅱ5 mining area No. 8 coal seam in Huaibei Zhuxianzhuang coal mine outburst prevention requirements, upward mining is used to exploit No. 10 coal seam as the lower protection seam. Numerical simulation indicates that mining-induced stress sheU（MISS） is formed by high stress in surrounding rock above the working face. In the early mining period, the stress shell is relatively complete and the concentration degree of stress shell is high. MISS goes upward gradually as the working face advances, the max height is about 111.4m. The low stress area in MISS becomes larger under the shell protection, while the stress concentration degree subsides. According to the numerical simulation and similarity simulation experiment, the No. 8 coal roadway and the roadway floor shall be respectively arranged within the protective range of the shell and 14m along No. 8 coal seam floor, where the roadway surrounding rock stress concentration degree is lowest, the damage is smallest and roadway most stable.