Influence of Roof Disturbance on Stope during Equipment Withdrawal in Fully-mechanized Caving Face
In order to further study the withdrawal technology of stopping mining equipment in fully-mechanized caving face of extra-thick coal seam,the influence of elastic strain energy of hard strata of the working face roof on the stability of withdrawal passage during stopping mining was studied by theoretical analysis and field measurement.Based on the stopping mining of 8111 fully-mechanized caving face in Tashan Coal Mine,through theoretical analysis and calculation,it is found that the release of elastic strain energy before fracture of roof conglomerate stratum directly affects the stability of equipment withdrawal passage of working face,and the energy released by rheology of mudstone stratum will aggravate the deformation of withdrawal passage.Reinforcement support and carbon dioxide pre-splitting were adopted to weaken roof and reduce the effect of stress release on withdrawal passage.At the same time,the technology of net laying in stopping mining was optimized to shorten stopping mining time and reduce the effect of strain energy release of overlying strata on the withdrawal passage,which was safe and efficient.
equipment withdrawalelastic strain energyrheologysafety and efficiency
NETL
NSTL
万方数据
维普
