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中文摘要：
以云冈极近距离煤层群11—2#煤层为研究对象，利用现场观测方法对处于下位煤层的81109工作面巷道掘进期间开挖初期和回采期巷道围岩变形特征进行分析。研究表明：下位煤层稳定的顶板结构在上覆煤层开采后形成，并承受上覆岩层的重量。巷道掘进期间，由于稳定结构块体产生变动，导致下位煤层顶板岩层变形增大；回采期间上覆岩层结构被破坏，上覆岩层下沉量增大，进而巷道围岩也产生较大位移。
英文摘要：
Taking 11-2# coal seam in extremely contiguous seams in Yungang Mine as the researching object, using on-site observation method, the paper studies the deformation charac- teristics of surrounding rock of 81109 working face in underlying seam in early tunneling and mining period. The study shows that the stability of the roof structure of the underlying seam is formed after the overlying coal seam mining, and it bears the weight of the overlying strata. During the roadway tunneling, the changes of the stable structure bulk may lead to increasing of the deformation of the underlying seam roof rock; in mining period, the structure of the overlying strata is destroyed, and its subsidence is increasing, so the roadway surrounding rock will have large displacement.
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