综采面回撤期间回撤巷道围岩应力演化规律研究

摘要

Based on shallow fully mechanized working face, surrounding rock stability of retracement roadway is analyzed during mining in working face to stop line, the mining process of working face toward the retracement roadway is simulated with FLAC, and the surrounding rock stress of retracement roadway is observed. The results show that, during the period of working face retracement, the abutment pressure of the main and auxiliary retracement channel superimposes with each other, coal pillar stress between which increases to 13�5MPa, while that during normal mining is 10MPa, the coal pillar between main and auxiliary retracement channel can bear the abutment pressure; when the working face and retracement roadway cut through, roadway convergence between the two sidewalls and the top end of the nearer quantity are 210mm and 320mm, the retracement roadway is stable, ensuring the safe retracement.%以浅埋深综采工作面为研究背景，针对工作面回采至停采线这一过程，对工作面回撤巷道的围岩稳定性进行分析，采用FLAC有限元模拟软件，对工作面回采接近回撤巷道这一过程进行模拟，并对回撤巷道的围岩应力进行观测。结果表明：工作面回撤期间主回撤巷道支承压力和辅回撤巷道围岩应力相互叠加，两者之间的煤柱应力值增至13�5MPa，较正常开采期间的应力值高3�5MPa，主辅回撤巷道之间的煤柱能够承受支承压力的作用；工作面与回撤巷道贯通时，巷道两帮移近量和顶底移近量分别为210mm和320mm，回撤巷道保持稳定，确保了工作面的安全撤出。