特厚煤层大巷煤柱支承压力分布规律研究

Study on support pressure distribution law of ultra thick seam gateway

针对特厚煤层综放工作面一次采出煤层厚度大,支承压力影响范围明显增加的问题,在保证煤层大巷长期稳定的前提下确定合理停采煤柱(大巷保护煤柱)宽度,以塔山煤矿8106特厚煤层综放工作面为研究对象,对8106综放工作面设计终采线与大巷之间的煤柱应力进行了连续监测,得到较完整的煤体应力随工作面推进距离及时间的变化曲线。结果表明:特厚煤层综放工作面支承压力在工作面经采后仍将缓慢变化,并在大约70 d趋于稳定;工作面超前支承压力明显影响范围为70~80 m,一般影响范围小于110 m。

According to one pass mining with high thick seam in the fully-mechanized top coal caving mining face in ultra thick seam,the support pressure influence scope obvious increased problem,on the premise to ensure a long term stability of the seam gateway,a rational terminal mining coal pillar( protective coal pillar of the seam gateway) width was determined. Based on No. 8106 fully-mechanized top coal caving mining face in the ultra thick seam of Tashan Mine as a study object,a continued monitoring and measuring was conducted on the coal pillar stress between the designed mining terminal line and the gateway of No. 8106 fully-mechanized top coal caving mining face. A completed variation curve of the coal stress with the forward advancing distance and time was obtained. The results showed that after the mining operation of the coal mining face stopped,the support pressure of the fully-mechanized top coal caving mining face in the ultra thick seam would still be varied slowly and would be in stabilization after 70 days. The advance support pressure influence scope of the coal mining face was about 70 ~ 80 m and a general influence scope would be less than 110 m.