In the heart of China’s coal mining industry, a groundbreaking study led by Peng Zhu from the School of Earth and Environment at Anhui University of Science and Technology is set to revolutionize how we manage mine water and potentially reshape the energy sector. The research, published in the journal ‘Meikuang Anquan’ (translated to ‘Coal Mine Safety’), delves into the complex world of water-conducting fracture zones in overlying strata of goafs, offering insights that could significantly impact mine safety and water management strategies.
The study focuses on the Lingxin Coal Mine, where the goal is to create an underground water reservoir to store high-salinity water, ultimately aiming for zero discharge of treated mine water. This is no small feat, as managing mine water, especially in highly mineralized environments, is a critical challenge for the industry. Zhu and his team employed advanced numerical simulations using FLAC3D finite difference software, incorporating rock mechanics and hydro-geological parameters to model the behavior of the overlying strata during mining operations.
The findings are both intriguing and practical. The research determined that the development height of the collapse zone and fracture zone during the mining process of the L1614 working face in the 14# coal seam is 15 meters and 56 meters, respectively. This information is crucial for understanding the permeability of the overlying strata, which is essential for designing effective water management systems.
One of the key takeaways from the study is the distribution of porosity and permeability coefficients in the caving zone. According to Zhu, “The horizontal distribution of porosity and permeability coefficient in the caving zone of 14# coal after mining is similar, showing a ‘basin’ shape, with the largest near the coal wall and the smallest in the central part.” This insight could guide engineers in optimizing the placement of water storage facilities and ensuring the structural integrity of the mine.
The longitudinal permeability coefficient of the water-conducting fracture zone was found to increase gradually from top to bottom, ranging from 1.07×10−6 to 0.89 m/s. This gradient is vital for predicting water flow and designing efficient drainage systems. The average permeability coefficient of the caving zone was determined to be 0.89 m/s, providing a benchmark for future simulations and real-world applications.
The implications of this research extend far beyond the Lingxin Coal Mine. As the energy sector continues to grapple with environmental regulations and the need for sustainable practices, understanding and managing mine water effectively becomes paramount. This study offers a roadmap for other mines to follow, potentially leading to widespread adoption of similar water management strategies.
The commercial impact for the energy sector is significant. By achieving zero discharge of treated mine water, mines can reduce their environmental footprint, comply with stricter regulations, and potentially lower operational costs associated with water treatment and disposal. This could make mining operations more sustainable and economically viable in the long run.
As the industry moves towards more sustainable practices, research like Zhu’s will be instrumental in shaping future developments. The ability to accurately model and predict the behavior of water-conducting fracture zones could lead to innovative solutions for water management, enhancing both safety and efficiency in mining operations. The study, published in ‘Meikuang Anquan’, serves as a testament to the ongoing efforts to advance mining technology and sustainability.
