The No.2 Longwall Mining Team of the 12417 Working Face at Bulianta Coal Mine of Shendong Coal successfully passed the waist roadway section with complex geological conditions. It marked the official implementation of the team’s innovative Mining Pressure Active Control Technology Based on Numerical Simulation. The technology successfully tackled three major difficulties in severe mining pressure, stress concentration and limited space. It injected technical impetus into stable mine production and supply.

The waist roadway section, affected by geological structures, featured a “hard roof + gangue interlayer” structure. The interval of periodic roof weighting shortened and stress superposition became obvious. Traditional “empirical” mining failed to adapt. It not only restricted the advancing speed but also posed potential safety hazards. Faced with the bottleneck, the No.2 Longwall Mining Team proposed a “data-driven decision-making” approach, and established a closed-loop system of “simulation guidance – on-site execution – dynamic review”. Relying on numerical simulation technology, the team transformed the dangerous geological section into a visualized “digital battlefield”. It digitally reproduced key indicators including the stress path of surrounding rock, and accurately identified the coupling relationship among mining height, advancing speed and support resistance. Through coordinated control of “three parameters”, technicians put forward adjustment suggestions based on model deduction before shifts. They precisely controlled mining height, maintained stable support and flexibly adjusted the advancing pace during shifts. They reviewed and optimized strategies after shifts. Mining pressure thus became predictable and controllable.

At present, the technology has been successfully applied. Roof weighting remains stable and support stress is balanced, effectively resolving the risk of roof accidents, and providing a new paradigm for safe and efficient mining under complex geological conditions.