Recent research from a team led by JIN Changyu at the Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines at Northeastern University has unveiled critical insights into the stability of surrounding rock in coal mines, particularly in the context of water accumulation in goaf. This study, published in the journal ‘矿业科学学报’ (Journal of Mining Science), combines field tests, laboratory experiments, and advanced numerical simulations to address a pressing concern in the mining sector.
In coal mines, goaf refers to the areas left unmined after coal extraction, which can pose significant risks when they flood. The research establishes that water accumulation in these voids can dramatically affect the stability of surrounding rock, leading to potential hazards for mining operations. “Pore water pressure exerts a significant impact on the surrounding rock and overlying rock mass,” JIN noted, emphasizing the importance of understanding these dynamics for safe mining practices.
Using cutting-edge 3D laser scanning and sonar technology, the team created detailed geometric models to study water bodies and goaf. Their findings reveal that once an old goaf floods, the surrounding rock becomes susceptible to water seepage and percolation. The research also identified a large plastic zone with low stability in the coal pillar situated between the goaf and roadway, a direct consequence of mining disturbances coupled with water seepage.
The implications of these findings extend beyond academic interest; they have significant commercial ramifications for the construction and mining industries. As water-related incidents can lead to costly delays and dangerous work conditions, the study suggests implementing temporary underground drainage facilities to manage water discharge effectively. This proactive measure could not only enhance safety but also improve operational efficiency, allowing companies to mitigate risks and reduce downtime.
This research underscores the necessity for the construction sector to adapt to the evolving challenges posed by underground water dynamics. By integrating innovative technologies and methodologies, the industry can better prepare for and respond to the complexities of mining operations. As JIN Changyu and his team continue to explore these critical issues, the potential for safer and more efficient mining practices looks promising.
For more information on this research, you can visit the Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines.
