In a groundbreaking study published in the ‘International Journal of Mining Science and Technology,’ researchers are tackling one of the most pressing challenges in coal mining: coal bursts caused by thick and hard roofs. Led by Jiaxin Zhuang from the Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention and the School of Mines at China University of Mining and Technology, this research introduces multistage hydraulic fracturing of horizontal wells (MFHW) as a promising solution to mitigate the risks associated with these explosive events.
Coal bursts pose significant hazards not only to miners but also to the stability of mining operations. Zhuang’s team employed numerical modeling and real-world applications to delve into the mechanics of MFHW, focusing on its ability to control coal bursts. “Our study provides new insights into the fracturing process, allowing us to categorize the degree of fracturing and its implications for safety in mining operations,” Zhuang stated.
The research introduces a novel damage parameter (D) to quantify the effectiveness of hydraulic fracturing in the roof. The findings categorize fracturing into four distinct levels: lightly-fractured, moderately fractured, well-fractured, and over-fractured. This classification is crucial for assessing the effectiveness of MFHW in real-time scenarios. Notably, the study highlights a key transition stage in the fracturing process, where a slowdown in crack development signals a shift towards a well-fractured condition, which is ideal for controlling coal bursts.
Moreover, the study reveals that after the application of MFHW, there is a marked decrease in both the zone range and peak value of front-abutment stress. This reduction is significant as it indicates a lower risk of mining-induced seismicity, which can lead to dangerous conditions underground. Zhuang noted, “By effectively managing mining-induced stress, we can ensure that the stresses remain below the ultimate stress level, significantly enhancing the safety of mining operations.”
The implications of this research extend beyond safety; they hold substantial commercial potential for the construction and mining sectors. The ability to effectively control coal bursts can lead to more efficient mining operations, reduced downtime, and lower costs associated with disaster management. As the coal industry continues to evolve, the insights gained from this study could pave the way for safer and more sustainable mining practices.
As the construction industry increasingly seeks innovative solutions to complex geological challenges, the findings from Zhuang’s research could serve as a reference point for future developments in mining technology. The methods and assessments proposed in this study not only enhance safety but also contribute to the overall efficiency of mining operations, which is vital in a sector that often grapples with the unpredictability of geological conditions.
For those interested in further exploring this research, Jiaxin Zhuang’s work can be found through his affiliation at Jiangsu Engineering Laboratory of Mine Earthquake Monitoring and Prevention, China University of Mining and Technology. The insights from this study mark a significant step forward in the ongoing effort to balance mining productivity with safety, promising a more secure future for coal mining operations in China and beyond.
