保护层卸压开采两煤层终采线合理位置确定

摘要

In order to study the stress distribution evolution of the surrounding rock during the protective seam mining process and to study the dynamic law influenced to the front floor gateway, based on the transmission law of the mining support stress in the front seam and seam floor, the FLAC2D was applied to simulate and analyze the surrounding rock stress distribution features of the mining face with differ- ent coal pillar width under the protective seam mining process in No. 11 seam as in No. 13 seam. The FLAC2D was also applied to monitor and measure the surrounding rock deformation of the gateway. The results showed that during the low protective mining process, 110 m coal pillar left could reduce the mining activities affected to the front floor gateway and when the mining operation was in the top protected seam, the final terminal mining lines set for the two seams should be eliminated at the same location and the distance between the two lines should be 30 - 50 m in order to reduce the overlying influences of the mining stress.%为了研究保护层开采过程中围岩应力分布演化及其对前方底板巷的动态影响规律，基于采动支承压力在煤层前方及底板内的演化规律，运用FLAC^2D模拟分析了淮南矿区11煤作为13煤下保护层开采过程中在不同煤柱宽度下的采场围岩应力分布特点，并进行了巷道围岩变形监测。结果表明：下保护层开采过程中，留110m煤柱可以减弱采动对前方底板巷道的影响，当开采上方解放层时，应避免两煤层终采线留设在同一位置，错距为30—50m，可以减少采动应力叠加影响。