In the heart of China, researchers are tackling a formidable challenge: the scorching temperatures of high rock tunnels. Zuliang Zhong, a professor at Chongqing University and lead author of a recent study, has delved into the intricate world of tunnel lining structures, seeking to mitigate the damaging effects of extreme heat. The findings, published in *Case Studies in Thermal Engineering* (which translates to *Case Studies in Thermal Engineering*), offer promising insights for the energy sector, particularly in the construction and maintenance of tunnels in geothermal areas.
Tunnels in high rock temperature environments face unique challenges. The heat from the surrounding rock can transfer to the tunnel lining, causing thermal stress and potentially compromising the structure’s integrity. Zhong and his team set out to compare two lining configurations: composite and sandwich. The latter includes a layer of thermal insulation, a feature absent in the former.
Their three-dimensional transient numerical model revealed that the sandwich lining’s thermal insulation layer significantly reduces heat transfer from the rock to the secondary lining. “The layer of heat insulation in the sandwich lining configuration effectively prevents heat from transferring from the rock to the secondary lining,” Zhong explained. This reduction in heat transfer translates to lower thermal stress on the secondary lining, enhancing its durability.
However, the benefits don’t come without trade-offs. The thermal insulation layer causes heat to accumulate in the initial support, increasing its stress. This finding underscores the complexity of designing effective tunnel linings for high rock temperature environments.
The implications for the energy sector are substantial. As we explore and exploit geothermal energy, the need for safe and reliable tunnels in high-temperature environments becomes increasingly pressing. Zhong’s research provides a crucial step towards understanding and mitigating the thermal challenges these tunnels present.
The study’s findings could shape future developments in tunnel construction, particularly in the energy sector. By optimizing lining structures, we can enhance the safety and reliability of tunnels in high rock temperature environments, facilitating the exploration and exploitation of geothermal energy.
As Zhong puts it, “Our findings will provide an analysis of high-temperature tunnel lining structures, helping to prevent and control tunnel heat damage and improve project safety and reliability.” This research is a testament to the power of scientific inquiry in addressing real-world challenges, paving the way for safer and more efficient energy infrastructure.