A Novel Calculation Method of Process Load for Extra-Large Section Tunnels

Gao, Hongjie; He, Ping; Chen, Zheng; Li, Xinyu

doi:10.3390/sym11101228

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…The calculation formulas for the deep single-hole tunnel arch rock pressure are provided in the Highway Tunnel Design Code (JTG/, 2010; Gao et al, 2019) as follows:…”

Section: An Analysis Of Surrounding Rock Pressure's Stability Valuementioning

confidence: 99%

Surrounding rock pressure calculation based on time functions and stress release rate determination of deep soft rock tunnel: taking Zhonghe Tunnel as an example

Ding,

Deng,

Zhang

et al. 2023

Front. Earth Sci.

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On the basis of the Zhonghe Tunnel project of the An-Lan Expressway, the objective of this study was to determine the appropriate method of calculating the steel arch load and stress release rate during numerical simulation. First of all, based on the monitoring results of six similar tunnel sections where the surrounding rock exerts pressure on the steel arch, using time functions, the rock pressure time history curve could be fitted, two formulas for calculating stable rock pressure in deep tunnels were compared, and the calculation model suitable for the Zhonghe Tunnel project was constructed. Then, a simulation of the Zhonghe Tunnel was performed using Flac3D, and stress release was simulated using the Mana method. By comparing the surrounding rock characteristic curves and the initial support characteristic curves under different stress release rates, the impact pattern of the stress release rate on the support load was summarized, and an appropriate excavation stress release rate was determined based on the stable rock pressure value calculation. It was found that the Zhonghe Tunnel rock pressure calculation model could better depict the change in rock pressure over time based on the empirical formula and Weibull time function. A prediction of the steel arch load of the Zhonghe Tunnel could be made using this method, and the stress release rate of the numerically simulated rock excavation was determined to be 0.5. This study thus provides a basis for the future internal force analysis and support parameter design of support systems.

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“…The calculation formulas for the deep single-hole tunnel arch rock pressure are provided in the Highway Tunnel Design Code (JTG/, 2010; Gao et al, 2019) as follows:…”

Section: An Analysis Of Surrounding Rock Pressure's Stability Valuementioning

confidence: 99%

Surrounding rock pressure calculation based on time functions and stress release rate determination of deep soft rock tunnel: taking Zhonghe Tunnel as an example

Ding,

Deng,

Zhang

et al. 2023

Front. Earth Sci.

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show abstract

“…The Bifurcation Section is shown in Figure 3. The Bifurcation Tunnel is a key control project in the entire transit expressway line and has a total length of 1435 m [30]. It is composed of three parts: the mainline section, the municipal section, and the port connecting section, of which the mainline section is divided into left and right lines.…”

Section: Project Overviewmentioning

confidence: 99%

Calculation Method of Loose Pressure in Surrounding Rock Mass

Gao

Zou

et al. 2023

Applied Sciences

Self Cite

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With the implementation of the regional coordinated development strategy, traffic flow has grown explosively. The construction of a larger tunnel section becomes an effective way to solve the highway network’s insufficient transport capability problem. Currently, there is little research on the factors influencing and methods of calculating the loose pressure in the surrounding rock mass for highway tunnels with super-large cross-sections. Based on the Bifurcation Tunnel, which is one of the sign projects in the past five years, this paper discusses the influencing factors for the range of loose zone in deeply buried tunnels using a combination of a numerical analysis and an orthogonal test. The weight of influencing factors is calculated via an efficiency evaluation method. This paper establishes a limit analysis model of the loose pressure in the surrounding rock mass under a non-linear failure criterion based on the fitted boundary function and upper bound limit analysis method and deduces the correlations of the loose pressure. The distribution law of the loose pressure, obtained via the limit analysis method, is consistent with the pressure-monitoring results, verifying the correctness of the proposed calculation method. This study can provide a calculation basis for the design of a supporting structure and the selection of similar super-section tunnel projects.

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“…to determine the parameters of double-arch tunnels [13,14,15,16]; to compare design and field data on tunnel parameters (China) [17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Assessing the stability of underground workings in urban infrastructure

Shapoval,

Shashenko,

Morklianyk

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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This article presents the analytical formulas necessary for making optimal design and technological decisions when laying shallow underground mine workings. They make it possible to determine the following critical parameters of mine workings: the critical height of the lift of the arch of natural equilibrium is the surface above which the rock is in an undestroyed state; stability coefficient of the arch of natural equilibrium (it shows in what state the rock above the excavation is); critical rock pressure is the pressure that, if exceeded, causes the rock to collapse above the working without support; critical depth of the mine working; critical pressure in the pore fluid is the pressure above which the rock collapse above the working without support; design maximum rock pressure with a given safety factor; design maximum depth of the working with a given safety factor; rock pressure on the support.

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A Novel Calculation Method of Process Load for Extra-Large Section Tunnels

Cited by 9 publications

References 6 publications

Surrounding rock pressure calculation based on time functions and stress release rate determination of deep soft rock tunnel: taking Zhonghe Tunnel as an example

Surrounding rock pressure calculation based on time functions and stress release rate determination of deep soft rock tunnel: taking Zhonghe Tunnel as an example

Calculation Method of Loose Pressure in Surrounding Rock Mass

Assessing the stability of underground workings in urban infrastructure

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