Mechanical responses of a shallow-buried super-large-section tunnel in weak surrounding rock: A case study in Guizhou

Zhao, Jinpeng; Tan, Zhiying; Yu, Rongsen; Li, Zonglin; Wang, Xiuying

doi:10.1016/j.tust.2022.104850

Cited by 21 publications

(25 citation statements)

References 28 publications

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“…5. (b), the development trend of surrounding rock pressure shows a rapid increase and then a gradually stable trend, which is similar to the monitoring results of Luo et al, Zhou et al, Zhao et al and others [19,42,45]. The uctuation section in the middle of the time history curve is mainly caused by step excavation.…”

Section: Analysis Of Mechanical 331 Surrounding Rock Pressuresupporting

confidence: 87%

“…9.. It can be seen that after the tunnel excavation is completed, the bolts at the vault do not have a signi cant tensile effect, this is similar to previous research results [42]. The bolts on both sides of the tunnel have a good effect on suppressing the deformation of the surrounding rock and should not be cancelled.…”

Section: Bolts Axial Forcesupporting

confidence: 86%

“…(a), the maximum value of surrounding rock pressure is 157.8kPa, located at the right spandrel. From the distribution perspective, the phenomenon of excessive surrounding rock pressure in the rst pilot tunnel of Xiabei mountain No.2 tunnel is relatively mild compared to the monitoring results of Zhao et al [42]. The main reason is that the temporary support parameters for the Xiabei mountain No.…”

Section: Analysis Of Mechanical 331 Surrounding Rock Pressurementioning

confidence: 82%

“…Code for design of railway tunnel. and Zhao et al determined that the burial depth of the Xiabei mountain tunnel is shallow [28,42]. Due to the excavation span reaching 26.3m, in order to reduce the disturbance of excavation on the surrounding rock, choose the double-side-wall pilot tunnel method for construction.…”

Section: Design and Construction Overviewmentioning

confidence: 99%

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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

Preprint

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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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Section: Analysis Of Mechanical 331 Surrounding Rock Pressuresupporting

confidence: 87%

Section: Bolts Axial Forcesupporting

confidence: 86%

Section: Analysis Of Mechanical 331 Surrounding Rock Pressurementioning

confidence: 82%

Section: Design and Construction Overviewmentioning

confidence: 99%

See 2 more Smart Citations

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

Preprint

Self Cite

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show abstract

“…The feasibility of the double support reinforcement scheme is veri ed by comparing the simulated value with the measured value. In addition, many scholars (Shi et al, 2019;Song et al, 2022;Zhao et al, 2023) have conducted extensive research on advanced support technology and its application in multi-engineering geology, and have achieved relevant research results. Although many scholars have studied and achieved a lot of results on the advanced support construction of long pipe sheds, due to their long size and the different angles of support, the support effect varies.…”

Section: Introductionmentioning

confidence: 99%

Influence of external insert Angle on structural deformation of long pipe shed with shallow hole

Jiang,

Mao,

Zhang

et al. 2023

Preprint

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The long pipe shed advanced support has the characteristics of large construction difficulty, wide support range, and easy deviation. The difference in construction dip angle will produce a different plastic zone of surrounding rock and supporting effects, and the rationality of advanced support design plays an important role in the safety of tunnel opening excavation. Based on the Tianshan Tunnel project, this paper aims at the problems of the loose pebble layer structure, poor cohesion, strong permeability, shallow excavation is not easy to form a confined arch, and easy to causes surrounding rock deformation and failure. Combined with the new method theory, the finite difference software FLAC3D was used to simulate seven excavation schemes of the shallow tunnel entrances. The mechanism and effect of advance support and the influence of construction angle on support effect are analyzed, and the simulation values are compared with the measured data. The results show that using long pipe shed advanced support can effectively reduce the disturbance of excavation to lose pebble rock mass and reduce the convergence value of surrounding rock. The results show that using long pipe shed advanced support can effectively reduce the disturbance of excavation to lose pebble rock mass and reduce the convergence value of surrounding rock. The plastic zone of surrounding rock produced by different angles can be divided into three parts. The structural stability difference of the C1 zone is small, and that of the C3 zone is large. The bending moment, shear force, and shape variables of the pipe shed decrease with the increase of the dip Angle, while the axial force increases with the increase of the dip Angle. According to the fitting effect of simulation results and measured values, the best supporting effect is when the dip Angle of shallow-buried tunnel advance support pipe shed is set in the range of 0°~3°.

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Investigation on evolution mechanism and treatment of invert damage in operating railway tunnels under heavy rainfall

Luo,

Yang,

Xie

et al. 2024

Bull Eng Geol Environ

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Mechanical responses of a shallow-buried super-large-section tunnel in weak surrounding rock: A case study in Guizhou

Cited by 21 publications

References 28 publications

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

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

Influence of external insert Angle on structural deformation of long pipe shed with shallow hole

Investigation on evolution mechanism and treatment of invert damage in operating railway tunnels under heavy rainfall

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