The underlying seam mining would cause an unfavorable influence to the mine transportation roadway for the upward seam mining.In order to determine the failure scope and degree of the mine transportation roadway influenced by the underlying seam mining as well as to set up the design of the underlying seam mining plan and to set up the reinforcement measures of the mine transportation roadway, the FLAC3D software was applied to the simulation on the displacement and deformation conditions of the mine transportation roadway as well as on the stress distribution of the rock strata in the mine roadway.The limit balance theory in combination with the features of the mine roadway surrounding rock and support system was applied to analyze the deformation failure causes of the mine roadway.The study results showed that the mining of No.21040 coal mining face would not affect to the stability of the mine roadway.After the mining of No.21060 coal mining face completed, the mine transportation roadway liner at the 280-500 m section of the mine roadway was failure in different degree.And the mine transportation roadway was seriously failure at the 240-440 m section of the mine roadway.The strength of the mine roadway surrounding rock was low and the integrality of the surrounding rock was poor.The failure of the mine roadway liner caused the support resistances reduced and the rock stress obviously increased in the mine roadway would be the cause to make the deformation failure in serious.%因下伏煤层开采对上覆煤层开采的运输大巷造成不利影响,为了确定采动影响下运输大巷的破坏范围及程度,以便制定下伏煤层开采方案的设计和大巷加固措施,采用FLAC<'3D>软件对采后运输大巷的移动变形情况及所处位置岩层的应力分布情况进行了模拟,结合极限平衡理论与大巷围岩及其支护体的自身特点,分析了大巷变形破坏的原因.研究结果表明:21040工作面的回采不会影响大巷的稳定,21060工作面回采结束,在大巷的280-500 m段,巷道砌体受到不同程度的损坏,其中240-440 m段破坏会较为严重.大巷围岩强度较低、完整性差,巷道砌体的损坏导致其支护阻力降低以及大巷所在位置岩层应力高是导致其变形破坏较为严重的原因.
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