介绍了3227工作面回风巷变形严重五个方面的原因,既围岩性质结构复杂,应力三阶段重新分布;窄煤柱处于应力集中带;工作面推进速度慢;巷道支护不充分,根据原因提出了改进意见。 The reasons for the serious deformation of the return air duct in 3227 working face are introduced. The characteristics of the surrounding rock are complicated and the stress is redistributed in three stages. The narrow coal pillar is in the stress concentration zone. The working face advancing slowly and the support of the roadway is not sufficient. Reason for the proposed improvement.