Research and practice on key technologies of 5G+ industrial internet-based intelligent coal mine and intelligent coal caving

Based on the intelligent coal mine construction task of CHN ENERGY Shendong Baode Coal Mine, this paper proposes a general construction scheme for an intelligent mine based on “5G + Industrial Internet" under the principle of ” Unified Data, Unified Model, Unified Platform, and Unified Solution", and constructs a “Four Layers + Two Wings” underground 5G integrated bearing network architecture: the Perception and Control Layer deploys various sensors to collect production and safety data, the Infrastructure Layer takes the 5G+ N×100G FlexE Hard Slicing Network as the core to achieve efficient transmission, the Smart Platform Layer undertakes data storage and in-depth analysis, the Decision and Application Layer supports multi-scenario intelligent applications, and the “Two Wings” refer to the unified data standards and industrial security protection system that ensure data interconnection and network security; medium frequency is adopted to meet the large bandwidth demand of the working face, while low frequency is used to achieve long-distance coverage of roadways, and the uplink transmission is enhanced through TDD (Time Division Duplex) time slot reversal and SUL (Supplemental Uplink) technology, and relying on FlexE slicing technology, 5 types of slices are divided to meet the latency and bandwidth requirements of different services, effectively supporting various intelligent scenarios such as fully mechanized mining inspection and remote driving of shuttle cars. Four core technologies were developed: ① Multi-behavior Time-series Planning Rapid Tunneling Technology: It innovates the “Roadheader-Bolter Integrator + Shuttle Car + Self-moving Conveyor Tail” equipment, integrates GA-BP (Genetic Algorithm-Back Propagation) neural network-based adaptive cutting, LiDAR obstacle perception, and power line carrier communication, solves the “last 100 meters” transportation bottleneck, and increases tunneling efficiency and advance rate by 10% and 15% respectively; ② 5G + Digital Twin-based Long-distance Directional Drilling Technology: It improves drilling accuracy by combining dynamic azimuth gamma geological steering; ③ “Automatic + Memory + Intelligent” Three-level Coal Caving System for extra-thick coal seams: It balances coal quality and resource recovery rate through asynchronous progressive scheduling, PID (Proportional-Integral-Derivative) closed-loop control, and AI (Video + Acoustic) coal-gangue identification; ④ Regional Multi-hazard Integrated Early Warning Technology: It integrates multi-source safety hazard monitoring data, adopts the CNN-LSTM (Convolutional Neural Network-Long Short-Term Memory) architecture to build a model, and achieves an early warning consistency rate of over 95%. Field application shows that this study has realized full-scenario 5G coverage in Baode Coal Mine, successfully warned of incidents such as water hazards and methane over-limit, shortened the disaster response time, and improved the mine safety management level. By deeply integrating 5G + Industrial Internet technology with the core business of coal mines, this study enables the mine to leap from single monitoring to “intelligent identification, accurate early warning, and linked disposal”, providing a technical paradigm and practical case for the high-quality development of coal mine intellectualization.