Longwall fully-mechanized mining technology on the strike of inclined slicing in high inclined and ultra thick spontaneous combustion tendency coal seam

In order to improve the mining rate of mine resources,the mining technical problem of similar formation coal seam in Dongxia Mine was solved and longwall fully- mechanized top coal caving mining method on the strike of inclined slicing was applied to No.37220 coal mining face. The theoretical analysis,physical analog simula tion,numerical simulation and site observation were applied to study on mining roading layout of coal mining face,equipment selection and matching of"three machineries", mine pressure and top coal migration law,surrounding rock stress distribution features and powered support stability of coal mining face ,mining technology,safety protection . technology and others. The site application results showed that different interface space layout was applied to coal mining face ,the mining technology was simplified and th e stability of support system was improved. Based on the different interface space layout,the application of different type powered supports could meet the production requi rements of the coal mining face and the safety protection technology mainly with“the ventilation and gas, coal dust and fire prevention and control"could effectively protect t he safety production of the coal mining face. The max output of coal mining face was 105 Kilotons per month. The mining rate of the seam was 89. 7%,the driving rate was 25 meters per ten kilotans and coal cost per ton was RMB 120. 95 Yuan per tons lower than the horizontal slice top coal caving mining.