In the ever-evolving world of underground construction, a groundbreaking study has emerged, poised to reshape how we understand and manage the internal forces acting on tunnels during shield tunneling under ground loading. Led by Xiang Pengfei of Shihezi University and a team of experts from various institutions, this research delves into the intricate dynamics of tunnel confining pressure and internal force analysis, offering insights that could significantly impact the energy sector and beyond.
The study, published in the prestigious journal ‘Yantu gongcheng xuebao’ (translated to ‘Chinese Journal of Geotechnical Engineering’), introduces several innovative circumferential load calculation formulas that consider the stress release effect of tunnel excavation. This is a game-changer, as it simplifies the influence of ground loading on tunnels into two critical stages: stress redistribution and transverse elliptization. “By introducing a shear dislocation and rigid body rotation collaborative deformation model, we’ve been able to derive internal force calculation formulas for any ring segment,” explains Xiang Pengfei. This breakthrough allows for a more precise understanding of the forces at play, ultimately leading to safer and more efficient tunnel construction.
The research team collected and analyzed 34 groups of measured water and soil stress data from tunnels both domestically and internationally. This extensive data set enabled them to propose an empirical formula for the stress release rate (σ). To validate their findings, they combined indoor model tests with theoretical calculations, demonstrating that the magnitude and distribution of tunnel confining pressure under surcharge load closely align with experimental results. “The confining pressure obtained by considering the stress release effect are closer to the measured values,” notes Qi Yongjie, a co-author from Zhejiang University. This accuracy is crucial for ensuring the structural integrity of tunnels, particularly in the energy sector where underground infrastructure is vital.
The implications of this research are far-reaching. For the energy sector, understanding the internal forces acting on tunnels can lead to more robust and cost-effective designs for pipelines, cables, and other critical infrastructure. By optimizing the design and construction processes, companies can reduce costs and minimize risks, ultimately enhancing the reliability of energy transmission and distribution systems.
Moreover, the study’s findings can inform the development of new technologies and methodologies for tunnel construction. As Xiang Pengfei puts it, “Our research provides a solid foundation for future advancements in the field.” This could include the development of smart materials and sensors that can monitor and respond to changes in tunnel confining pressure in real-time, further enhancing the safety and efficiency of underground construction projects.
In conclusion, this groundbreaking research by Xiang Pengfei and his team offers a deeper understanding of the internal forces acting on tunnels during shield tunneling under ground loading. By providing more accurate and reliable data, this study paves the way for advancements in tunnel construction and design, with significant implications for the energy sector and beyond. As the field continues to evolve, the insights gained from this research will undoubtedly play a crucial role in shaping the future of underground infrastructure.