Study on Roof Movement Law of Shortwall Continuous Coal Mining Face

In order to prevent the bumping occurred by the large area roof weighting and to optimize the stress distribution caused by the coal mining, according to the deposition features of the thin base rock and thick overburden in Yujaliang Mine, the coal mining technology with full roof falling method was adopted in No.42209 shortwall continuous coal mining face, a conception of the technical limit mining area and the stress limit mining area were provided and roof control of the shortwall mi ning was realized. The results showed that the strike and side stress concentrated cofficients of the advance support pressure caused by the mining operation were 3. 4 and 2.1 individually. According to the site measurements, the technical limit mining area was 1 500 m2and the stress limit mining area was 15 000 m2. The full roof fa ling control mode with artificial forced roof falling + short distance natural roof falling applied to the roof could effectively ensure the safety of the mining technology.