Stability control technology of coal drift in deep underground mine

In order to solve the support difficulty,high repair rate and high failure ratio problems of the mining roadway in the deep section of Yaoqiao Mine,Datun Minin g Area,with the theoretical analysis and the site investigation,the great deep depth of the mining roadway,the soft,weak and broken lithology and frequent surrounding neig hbor mining influences would be the major causes of the large deformation occurred.The previous support method was hard to meet the stability control requirements of th e surrounding rock along the deep roadway.Based on the circumstances,a new bolt-mesh-anchor coupling support design plan with an integration of an " intensified suppor t" and "proper yielding" was provided.The site application results showed that during the roadway driving period,a max convergence of the two sidewalls was 127 mm only, a max subsidence of the roof was 43 mm and the max floor heave was 42 mm. During the mining period,the floor heave of the roadway was mainly occurred,the max floor heave was 112 mm and was about two times higher than the convergence of the two sidewalls.The influence scope of the mining support pressure was ranging from 180 ~ 200 m,the serious influence area was 80 ~ 100 m and the obvious effect to control the roof-floor and the two sidewalls deform ation with the obuous bolt-mesh-anchor coup ling support system was verified.