In the heart of China’s coal mining industry, a groundbreaking study is shedding light on how mining speed can influence the activation of normal faults in deep, thick coal seams. Led by Dr. Bian Hua from the Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources at China University of Mining and Technology-Beijing, this research could significantly impact the safety and efficiency of coal extraction processes.
The study, published in the Journal of China University of Mining and Technology, focuses on the 8302 working face of the Xinjulong Coal Mine. It explores the activation mechanism of normal faults when mining occurs on the hanging wall, a critical area for understanding and mitigating geological risks. “The high-level stratum of a normal fault is a high-risk area for fault plane activation,” explains Dr. Bian. “Our research shows that the activation tendency is influenced by both the fault’s inclination and the mining speed of the working face.”
The findings reveal that the activation process can be divided into two stages: quasi-static and activation. As the mining speed increases, the peak stress of the surrounding rock initially decreases but then increases again. Notably, when the mining speed is set at 3 meters per day, the peak stress reaches its minimum of 28.12 MPa, alleviating stress concentration in the surrounding rock. This discovery could lead to more precise and safer mining practices.
The study also highlights that when the distance between the working face and the fault is less than 30 meters, the risk of fault plane activation significantly increases. However, with a mining speed of 3 meters per day, the activation tendency of the fault plane reaches its minimum, and the distance causing fault activation is reduced to 40 meters. “This speed outperforms other mining speeds in terms of reducing activation risk,” notes Dr. Bian.
The implications for the energy sector are substantial. By optimizing mining speeds, companies can enhance safety, reduce the risk of geological hazards, and improve overall efficiency. This research could shape future developments in the field, leading to more advanced and precise mining techniques that minimize risks and maximize productivity.
As the global demand for energy continues to grow, understanding and mitigating geological risks becomes increasingly crucial. Dr. Bian’s research provides valuable insights that could revolutionize the way coal is extracted, ensuring a safer and more sustainable future for the industry.