Research on key technologies of intelligent working face in coal

Mining of fully mechanised intelligent working face with large mining height (MFMIWF-LMH) is a technology which allows the mining of 3.5-8.8 m thick coal seams at one time using a whole set of fully mechanised mining intelligent equipment. The MFMIWF-LMH is characterised by complex production process, numerous types of equipment and severe mine pressure. In terms of mine pressure appearance, MFMIWF-LMH is likely to undergo a significant increase in the failure strength of surrounding rock, an obvious rise of the abutment pressure and peak value, and rib spalling and roof fall of coal wall. The study analyses the problems existing in MFMIWF-LMH and puts forward targeted solutions. In addition, it is proposed in the study that the system of MFMIWF-LMH is a complex systematic engineering whose key control technologies include general control network technology, coupling control technology of surrounding rock support, high-definition visualisation technology, rapid support-moving control technology, and equipment 3D virtual reality technology in the working face. The field engineering practice is a beneficial exploration for MFMIWF-LMH.