Abstract: In view of the persistent mining disturbance from horizontal section top-coal caving, numerical simulation was used to study the distribution characteristics of plastic district, stress field and displacement field at the stages of mining current and next sublevels, and the surrounding rock stress distributions at next sublevel entries were intensively discussed. Meanwhile, the effect characteristics of mining disturbance were monitored and analyzed in field test. The results show that the disturbance effect of upper sublevel to next sublevel is weakened gradually with the increase of horizontal section height, and the larger thickness coal mass can play a cushion influence. In the next sublevel, the floor side stress in B3 roadway at +518 m level is larger, while the roof side stress in B6 roadway at +518 m level is larger. The advanced distance of mining disturbance affected by the upper sublevel is 10~20 m. Influenced by both the mining disturbance and caving effect of gob strata, the bolt tension variation in the entries of next sublevel is lagging behind the working face.

Key words: steeply inclined coal seam, mining disturbance, full-mechanized caving mining, horizontal section, spatial structure