Abstract: In this paper, to ensure the stability of the coal wall and head face roof, and realize the safe and high efficient production in the upward full-mechanized caving face, the instability characteristics of coal wall and immediate roof was analyzed, the mechanics model and condition to keep the stability of coal wall and head face roof were established, and the interaction between the setting load of support, the front angle of column, and the upward mining angle was discussed. The results indicate that the increasing of upward minging angle, the improving of setting load and the reducion of the front angle of column, are beneficial to control the stability of the coal wall and head face roof. When the front mining angle is less than 11°, the key point is to control the roof subsidence, otherwise, the key point is to control the rib spalling and roof downslide in the face. Combined with the field conditions of No.80113 up- ward full-mechanized caving face in one mine, the reasonable setting load of support and front angle of column were defined, and the pertinence measure to control the stability of surrounding rock was put forward, which has ensured the safe and high efficient production.

Key words: front angle of column, upward mining angle, setting load of support, full-mechanized caving face, surrounding rock stability in head face