In a significant advancement for the mining industry, researchers at the China University of Mining and Technology-Beijing have unveiled a groundbreaking layout scheme aimed at optimizing the use of coal resources while enhancing roadway support mechanisms. This innovative approach comes in response to the challenges faced at the Xinjulong Coal Mine, particularly concerning the large coal pillar sizes that have historically led to resource wastage.
Lead author WANG Zhiqiang, affiliated with the School of Energy and Mining Engineering, emphasizes the importance of this research in addressing both operational efficiency and safety in mining operations. “By rethinking the configuration of our external staggered roadways and coal pillars, we can significantly reduce the reserved size of coal pillars while improving the overall coal recovery rate,” WANG stated. This statement encapsulates the dual goals of maximizing resource extraction and minimizing waste, which are critical in an industry facing increasing economic pressures.
The study meticulously builds a mechanical model for unconventional coal pillars, focusing on their staggered positions. Utilizing limit equilibrium theory, the researchers analyzed the stress environment surrounding these pillars. Their findings revealed that a horizontal staggered distance of 3.0 meters for the bottom roadway is optimal, considering various stress conditions and the distribution of elastic strain energy density within the coal pillars.
One of the most compelling outcomes of this research is the introduction of a joint support scheme for adjacent roadways. Simulations conducted under actual geological conditions during the mining phase demonstrated that this new support scheme significantly outperformed the previously established methods. The peak stress in the joint support scheme dropped from 80 MPa to 64 MPa, marking a notable 20% reduction in stress levels. This enhancement not only improves the stability of the roadway but also contributes to safer working conditions for miners.
Furthermore, the study reported a substantial decrease in the unit reserved area of coal pillars—from 170 m² to 111.5 m²—representing a 34.4% reduction. This reduction is not merely a technical achievement; it translates into real economic benefits for mining operations by allowing for more efficient resource extraction and reducing the physical footprint of mining activities.
As the construction sector increasingly seeks sustainable and efficient practices, the implications of this research extend beyond the mining industry. WANG’s findings could influence future developments in construction methodologies, particularly in projects that require careful management of resources and environmental impacts. “Our research offers a pathway to not only enhance coal recovery but also sets a precedent for sustainable mining practices that can be adapted across various sectors,” WANG added.
Published in the Journal of Mining Science (矿业科学学报), this study represents a pivotal moment in the quest for innovative solutions in the mining sector. The ongoing evolution of mining techniques, as highlighted by this research, suggests a future where resource efficiency and safety are paramount, paving the way for a more sustainable construction landscape.
For further details on this groundbreaking work, you can visit the School of Energy and Mining Engineering at the China University of Mining and Technology-Beijing.
