Abstract
The calculation of load and surrounding rock pressure of extra-large-section tunnels serves as an important premise for the design and construction of tunnel projects with extra-large sections. Based on the large-span section of the Shenzhen Liantang Tunnel (China), which is the largest highway tunnel in the world to date, this paper discusses the challenges existing in the calculation method of state load and surrounding rock pressure for extra-large-section tunnels and puts forward a novel calculation method for process load, which is suitable for extra-large-section highway tunnels. In the current work, we derived the related application correlations and improved the specific application steps, methods, and project models of the proposed calculation method. Both the rationality and feasibility of the calculation method were verified from a practical perspective by comparing the on-site data of surrounding rock pressure at the Liantang Tunnel with the calculated load, which provides a fundamental basis for the process design of tunnels.
Highlights
Due to the fast-paced urbanization in China, rapid developments in the transportation industry, and improvements in vehicle capacity and road grade requirements, the design width of highway tunnels has greatly increased
If an unsuitable correlation is used to calculate the load and surrounding rock pressure, it will increase the difficulty of tunnel design and eventually lead to hidden dangers in tunnel safety or significant economic problems
This paper discusses the problems existing in the application of load and surrounding rock pressure calculation methods to extra-large-section tunnels
Summary
Due to the fast-paced urbanization in China, rapid developments in the transportation industry, and improvements in vehicle capacity and road grade requirements, the design width of highway tunnels has greatly increased. Due to the peculiarity of the structural design of extra-large-section highway tunnels, the large span of the sections, and the complex stress conditions and construction procedures, the limitations of commonly used methods to calculate the loosening loads of tunnels are becoming increasingly prominent. Based on the summary of the calculation methods of tunnel load and surrounding rock pressure, and considering the calculation process, we analyzed the influencing factors, the different surrounding rock conditions, and the applicable conditions of various correlations, and the results are presented in. This paper discusses the problems existing in the application of load and surrounding rock pressure calculation methods to extra-large-section tunnels On this basis, we proposed a concept of process design load and focused on the difference and relationship between the process load calculation method and the traditional state load calculation method. By comparing the on-site monitored pressure data and the calculated load results, this paper demonstrates the rationality and feasibility of the process load calculation method from a practical perspective and provides a theoretical reference and a calculation basis for the design and construction of similar projects in the future
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