关键词: 不等长工作面, 采动影响, 覆岩活动, 巷道变形, 现场监测

Abstract: Affected by fault，the length of 2225 working face in Xingdong coal mine，Jizhong Energy Resources Co.，Ltd.，presents 50 m，80 m and 126 m along with the drifting direction.In order to research the laws of overburden strata movement and roadway deformation under the influence of strata movement in the unequal length of working face，monitoring instruments were installed in the roof and floor stratum and surrounding rock of roadway to monitor the roof strata displacement，the destroyed floor depth and the roadway deformation.The results showed that：With working face advancing，there is a gradual increase for the laws of overburden strata movement and roadway deformation under the influence of strata movement.As for No.1 monitoring station，when the working face was -32～-42.8 m distant from the station，the displacement rate of floor strata was 4 mm/m，and the destroyed floor depth surpassed 45 m.As for No.3 monitoring station，when the working face was 40.1 m distant from the station，the relative displacement between roof and floor strata was about 0.45 m，the relative displacement between roadway's sides was about 0.5 m and the displacement rate was 20 mm/d.And there is a great influence for the length of working face to the disturbance and displacements of the floor strata，with a significant increase on the elongation of the working face length.As for No.2 monitoring station where the length of working face was 126m，the floor disturbance distance ahead was about 40.5 m，and the floor strata displacement was approximately 300 mm；by contrast；As for No.1 monitoring station where the length of working face was 50 m，the floor disturbance distance ahead was about 92.8 m，and the floor strata displacement was just 90 mm.

Key words: Unequal length of working face, Mining influence, Overburden strata movement, Roadway deformation, Field monitoring