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FLAC2D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110 m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30～50 m,可以减少采动应力叠加影响。

In order to study the stress distribution evolution of the surrounding rock during the protective seam mining process and to study the dynamic law influen ced 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 an alyze the surrounding rock stress distribution features of the mining face with different coal pillar width under the protective seam mining process in No.11 seam as in N 0.13 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 mi ning 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, t he 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 3050 m in order to redu ce the overlying influences of the mining stress.

国家自然科学基金资助项目(51074004,51004002)；中国矿业大学煤炭资源与安全开采国家重点实验室开放基金资助项目(08KF03)；安徽省高等学校优秀青年人才基金资助项目(2010SQRL044ZD)；安徽高等学校省级自然科学研究资助项目(KJ2009A139)；安徽理工大学青年科学研究基金资助项目(QN200803)；