Abstract
Limited drainage tunnels face pore water pressure, water inflow, and permeability challenges. At present, there is little systematic analysis and research on the lining water pressure of sub-sea tunnels, and there is a lack of verification of relevant engineering examples and field monitoring data. Based on the numerical simulation method, this paper discusses the lining water pressure and its reduction coefficient of the horseshoe section tunnel, which is verified by an engineering example. Based on many numerical simulations, the recommended value of the water pressure reduction coefficient considering the thickness of the grouting ring and grouting effect is put forward. The stress law and safety of tunnel lining under different water reduction coefficients are studied, and the safety of lining is evaluated combined with the measured data of lining stress. The results show that the numerical simulation has been well verified. Considering the water pressure according to the water pressure reduction coefficient method proposed in this paper can ensure the structural safety of tunnel lining. The method of lining water pressure reduction coefficient proposed in this paper can provide a reference for the subsequent lining design of the sub-sea tunnel.
Highlights
With the improvement of China’s synthetic national power and the development of transportation, the construction of underwater tunnels has ushered in a good development period [1]
Stress and safety of lining under different water pressure reduction degrees based on the sub-sea tunnel project of Qingdao Metro Line 8, through the combination of and the calculation safety of and tunnel is evaluated with field monitoring d numerical fieldlining test, combined with thecombined actual situation of the project, the factors with significant influence effect are selected, and a selection table of underwater tunnel water pressure reduction coefficients consideringCoefficient these factors isof proposed
Because can be seen from 6 that numerical calculation is slightly different from the stratum is regarded as isotropic in the numerical calculation, and it is considered that the field measurement of the external water pressure distribution of the initial support
Summary
With the improvement of China’s synthetic national power and the development of transportation, the construction of underwater tunnels has ushered in a good development period [1]. El Tani [19] and Kolymbas and Wagner [20] There another is a lack of systematic analysis of thetoexternal of tunne adopted analytical method, conformal mapping, study thiswater problempressure under differtheboundary verification of relevant engineering examples and and field monitoring data ent conditions along the tunnels, such as zero water pressure constant water head. Stress and safety of lining under different water pressure reduction degrees based on the sub-sea tunnel project of Qingdao Metro Line 8, through the combination of and the calculation safety of and tunnel is evaluated with field monitoring d numerical fieldlining test, combined with thecombined actual situation of the project, the factors with significant influence effect are selected, and a selection table of underwater tunnel water pressure reduction coefficients consideringCoefficient these factors isof proposed
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