In the high-stakes world of tunnel construction, particularly in the energy sector where deeply buried tunnels are crucial for infrastructure projects, a recent study offers a significant breakthrough. Researchers led by DENG Xianghui from the School of Architectural Engineering at Xi’an Technological University have developed a method to optimize the inclination angle of locking anchor pipes, a critical component in the support systems of soft rock tunnels. This research, published in ‘Yantu gongcheng xuebao’ (translated to ‘Chinese Journal of Geotechnical Engineering’), could revolutionize how engineers approach tunnel excavation and support, potentially saving time and resources while enhancing safety.
The study focuses on the combined support of steel frames and locking foot anchor pipes, a measure widely used to control the deformation of surrounding rock in tunnels. The key innovation lies in deriving a mechanical analytical model that predicts the optimal setting angle of these anchor pipes after the excavation of upper and middle benches. “The setting angle of the locking foot anchor pipe is an important parameter affecting its support effects,” explains DENG Xianghui. “Our research provides a theoretical formula for this angle, which can significantly improve the stability and safety of tunnel construction.”
The researchers used the Zhonghe Tunnel as a case study to validate their model. They found that the settlement of the tunnel vault predicted by their mechanical model closely matched the actual measured values. This consistency is a strong indicator that the model can be reliably applied in real-world scenarios. The optimal setting angle for the locking foot anchor pipe was determined to be between 60° and 70°, a finding that could standardize practices in the industry.
For the energy sector, the implications are substantial. Deeply buried tunnels are often essential for transporting resources and connecting energy infrastructure. The ability to optimize the support systems for these tunnels can lead to more efficient and safer construction processes. “This research provides a theoretical basis for the optimization design of the dip angle of the locking foot anchor pipe in the step excavation of deeply buried tunnels,” says HE Hailong, a co-author of the study. “It can help engineers make more informed decisions, ultimately reducing costs and improving project outcomes.”
The study’s findings are particularly relevant for companies involved in large-scale infrastructure projects, such as China Railway 18th Bureau Group Fifth Engineering Co., Ltd., where co-author ZHAO Bangxuan works. The practical application of this research could lead to more robust and cost-effective tunnel designs, benefiting both the construction industry and the energy sector.
As the demand for energy infrastructure continues to grow, the need for efficient and safe tunnel construction becomes ever more critical. This research offers a promising step forward, providing engineers with the tools they need to optimize their designs and ensure the stability of deeply buried tunnels. The study’s publication in ‘Yantu gongcheng xuebao’ further underscores its significance within the academic and professional communities.
In the broader context, this research highlights the importance of continuous innovation in the construction industry. As projects become more complex and the stakes higher, the need for advanced mechanical models and analytical tools becomes paramount. The work of DENG Xianghui and his team exemplifies how theoretical research can translate into practical solutions, shaping the future of tunnel construction and energy infrastructure.