ABSTRACT
As a vital ventilation channel in long highway tunnels, shaft channels play a crucial role in regulating air pressure and ventilation and ensuring disaster prevention and rescue operations. Despite the existence of relatively mature technologies in the mining and hydropower industries, both domestically and internationally, research on shaft construction has predominantly focused on enhancing the mechanisation of shaft construction and increasing the number of monthly driving meters. However, limited research exists on the mechanical characteristics of deep shaft construction in long and deep-buried highway tunnels. This paper introduces the Precast Diamond Framed Lining Structure (PDFSL), developed based on simulations and analyses of the Huayingshan tunnel shaft, which features interlacing surrounding rock grades. This innovative approach aims to minimise construction costs, shorten the construction period, maintain high-quality standards, and reduce environmental impacts and local disruption.
