Negative Poisson’s ratio cable compensation support for 32 m super-large-span highway tunnel: A case study

Guo, Aipeng; He, Manchao; Liu, Songyuan; Du, Zhifeng; Lyu, Zhan; Tao, Zhigang

doi:10.1016/j.undsp.2023.07.001

Cited by 10 publications

(2 citation statements)

References 32 publications

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“…With the rapid expansion of urban railways, the construction of subway tunnels has progressively revealed the evolution features of enormous burial depth, large sections, and big spans [1][2][3][4][5]. The increase in the number of large-section tunnels has also created some engineering challenges, such as surrounding rock deformation [6][7][8], support structure instability [9][10][11], and lining cracking [12][13][14], which have seriously threatened project construction and operation safety.…”

Section: Introductionmentioning

confidence: 99%

Optimization Analysis of Partition Wall Support Scheme of Multi-Arch Tunnel

Yang,

Li,

Zhang

et al. 2024

Buildings

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With the fast progress of infrastructure projects, super-large cross-section projects are constantly emerging, and, therefore, engineering challenges and problems are increasing. Taking the triple-arch tunnel project in the turn-back line section of Santunbei Station in Urumqi Metro Line 1# as a case study, this research applied numerical simulation software Midas GTS/NX 2022 for the analysis of tunnel force and deformation in triple-arch cross-sections under different support forms of partition wall. Following the optimization of the support design of the mixed partition wall to a single straight wall, the following analytical results were obtained: surface settlement was decreased by 21.15% at the original cross-section; maximum values of principal stress and displacement of partition wall were decreased by 6.73 and 10.64%, respectively; and corresponding values for initial support structure were decreased by 21.47% and 54.74%, respectively. Meanwhile, combined with comparative analysis of engineering measurement and numerical simulation results, surface settlement and vault deformation were found to be similar to the optimized simulation results, which not only verified the reliability of simulation results but also ensured the safe and smooth construction of the project, greatly improving construction efficiency and saving construction time and cost.

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Section: Introductionmentioning

confidence: 99%

Optimization Analysis of Partition Wall Support Scheme of Multi-Arch Tunnel

Yang,

Li,

Zhang

et al. 2024

Buildings

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“…Zhang et al 27 used on-site monitoring methods to study the construction mechanical response and deformation characteristics of large-span and small spacing tunnels. Guo et al 28 used on-site monitoring methods to study the application of negative Poisson's ratio bolts in super large span tunnels. Li and Zhao 29 analyzed the mechanical response of loess tunnels using step excavation method based on on-site monitoring data.…”

Section: Introductionmentioning

confidence: 99%

Support mechanical response analysis and surrounding rock pressure calculation method for a shallow buried super large section tunnel in weak surrounding rock

Lai,

Wang,

Tan

et al. 2024

Sci Rep

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At present, China's demand for high-speed railway construction is constantly increasing, and the construction of Multi line high-speed railway tunnels has been put on the agenda. The design and construction issues of super-large-sections tunnels urgently need to be addressed. The Xiabei mountain No. 1 and No. 2 tunnels in the Hangzhou-Taizhou Railway are typical shallow-buried super-large-section-tunnels in weak surrounding rock, and their design and construction issues are representative. Eleven monitoring sections were set up in the tunnel, including tunnel deformation, surrounding rock, shotcrete, steel frames, bolts and temporary support mechanical responses. Taking the monitoring data of the most typical cross-section as an example, the mechanical response of the support structure of a shallow-buried super-large-section tunnel was analyzed in detail. Based on previous research results, this paper discusses and summarizes the common construction problems of this type of tunnel, and puts forward corresponding suggestions. The existing formula for calculating surrounding rock pressure has poor applicability to super-large-section tunnels constructed by step excavation, resulting in conservative support parameters. Therefore, based on the monitoring values of surrounding rock pressure at 10 monitoring sections in Xiabei mountain No. 1 and No. 2 tunnels, empirical parameters reflecting the impact of step excavation were summarized. Based on the Wang formula and combined with the step excavation empirical parameters, an empirical formula for the surrounding rock pressure of shallow-buried super-large-section tunnels considering step excavation was constructed. The calculated results are in good agreement with the on-site monitoring data. This study can provide a good reference for similar projects.

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