In the depths of China’s coal mines, a silent battle rages against water seepage, a persistent foe that threatens both safety and productivity. Traditional methods of combating this issue have often proven costly and inefficient, but a groundbreaking study published in Meitan kexue jishu, which translates to Coal Science and Technology, offers a promising new approach. Led by Ang Li from the College of Civil and Architectural Engineering at Xi’an University of Science and Technology, the research delves into the hydrophobic depressurization method, a technique that could revolutionize water management in deep coal mining.
Li and his team have developed a visual similar simulation experiment platform to tackle the complex conditions of deep rock strata. “The seepage problem of the shaft wall caused by roof pressure water is particularly serious,” Li explains. “It not only threatens mine safety but also brings challenges to traditional grouting management methods, such as high cost, difficult construction, and repeated seepage problems.”
The hydrophobic depressurization method involves simulating the water pressure on the well wall and observing the flow rate changes under different rock formations and numbers of water discharge holes. The results are striking: the flow rate at the outlet increases with the pipe diameter, and the water flow rate is significantly higher with two holes compared to a single hole. Moreover, the influence range of the landing funnel increases with the number of discharge holes, forming a symmetrical, conical shape at the bottom.
The practical implications of this research are immense. In a real-world application at the Binchang Wenjiapo coal mine, the team conducted on-site water discharge tests. The results were impressive: a single-hole water discharge stabilized at 75 cubic meters per hour, while a double-hole discharge reached 175 cubic meters per hour. The groundwater level was significantly lowered, forming a landing funnel with a maximum depth of 40 meters. “The actual measurement in the field is more in agreement with the results of the simulation experiment,” Li notes, highlighting the method’s reliability.
For the energy sector, this research could mean a paradigm shift in water management. Deep vertical shafts often traverse multiple aquifers, making water seepage a constant challenge. The hydrophobic depressurization method offers a more efficient and cost-effective solution, potentially saving millions in maintenance and repair costs. Moreover, by stabilizing the groundwater level, mines can operate more safely and sustainably, reducing the risk of accidents and environmental impact.
The implications extend beyond coal mining. Any industry dealing with deep shaft construction, from oil and gas to geothermal energy, could benefit from this innovative approach. As Li’s research gains traction, it could pave the way for new standards in water management, enhancing safety, efficiency, and sustainability across the board.
The study, published in Meitan kexue jishu, marks a significant step forward in the field of mining technology. As the energy sector continues to evolve, innovations like the hydrophobic depressurization method will be crucial in overcoming the challenges of deep resource extraction. The future of mining looks brighter, one water-free shaft at a time.
