Field Monitoring of the Deformation and Internal Forces of the Surrounding Rock and Support Structures in the Construction of a Super-Span High-Speed Railway Tunnel—A Case Study

Liu, Daoping; Zhang, Dingli; Fang, Qian; Sun, Zhenyu; Luo, Juan; Li, Ao

doi:10.3390/app10155182

Cited by 12 publications

(5 citation statements)

References 18 publications

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“…Due to the late start of single-hole four-lane highway tunnels, research in the field of tunnel engineering on large-span highway tunnels mainly focuses on single-hole threelane highway tunnels and double-track railway tunnels [8][9][10], while there are limited studies on single-hole four-lane super large-span highway tunnels. Previous research on large-span highway tunnels has mainly focused on construction methods [11,12], support parameters [13][14][15], and stability control of surrounding rock [16][17][18] during construction. Nevertheless, there has been less attention paid to the stress properties of the secondary lining of large-span highway tunnels, and related research has mainly focused on load effects.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Secondary Lining in Super Large-Span Tunnels Considering Temperature Effects

Dong,

Luo,

Chen

et al. 2024

Symmetry

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Temperature stress has a significant impact on the structural stress of (super) large-span tunnel lining, which can easily lead to structural fatigue damage and premature cracking. With the increasing scale and quantity of super large-span tunnels, the issue of temperature stress in secondary lining has attracted widespread attention. Previous studies have paid little attention to the influence of temperature stress on the structural internal forces of ordinary small–medium-span tunnels, but this influence cannot be ignored for super large-span tunnels. We take the Letuan Tunnel (a double-hole eight-lane tunnel) of the Binzhou-Laiwu expressway renovation and expansion project in Shandong Province as a case study and analyze the mechanical response of the secondary lining through on-site measurement. Moreover, a numerical simulation was conducted to evaluate the effects of self-weight and temperature stress on the secondary lining of the case tunnel. The results indicate that: the stress of the secondary lining concrete and steel bars is greatly affected by seasonal temperature changes. The compressive stress of the concrete and steel bars is significantly greater in summer than in winter, and the tensile stress is greater in winter than in summer. Furthermore, multiple measurement points have shown a phenomenon of transition between tensile and compressive stress states. The stress of concrete and steel bars fluctuates periodically with a sine function over time, with a fluctuation period of one year. The structural stress increases with the increase of summer temperature and decreases with the decrease of winter temperature. The fluctuation amplitude of stress in the inner side of the lining concrete and steel bars is greater than that on the outer side. Among them, the stress amplitudes of the inner and outer sides of the concrete are between 0.77–1.75 MPa and 0.44–1.07 MPa, respectively, and the stress amplitudes of the inner and outer steel bars are between 5–31 MPa and 7–13 MPa, respectively. The safety factors in summer are lower than those in winter. The minimum safety factors for secondary lining in summer and winter are 3.4 and 4.6, respectively, which can meet the safety requirements for service. The average axial forces of the secondary lining under the coupling effects of self-weight and temperature in winter and summer are 528 MPa and 563 MPa, respectively, which are significantly greater than the combined axial forces under their individual effects. The bending moment distribution of the secondary lining at the tunnel vault, inverted arch, wall spring and other positions under the coupling effect of self-weight and temperature is different from or even opposite to the bending moment superposition result under the two individual actions. The achieved results reveal that the influence of temperature stress on the service performance of the lining structure cannot be ignored, and the research results can provide useful reference for similar tunnels and related studies.

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Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Secondary Lining in Super Large-Span Tunnels Considering Temperature Effects

Dong,

Luo,

Chen

et al. 2024

Symmetry

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“…In the meantime, the findings of numerical modeling revealed that the damage rule of the tunnel's surrounding rock was governed by both stress and lithological characteristics, which was extremely consistent with experimental results. Liu et al (2020) took the Badaling Great Wall station in Beijing as the research object, selected a typical monitoring section in the super-span transition section of the tunnel, and methodically monitored deformation and stress between surrounding rock and supporting structures [24]. Their findings revealed that deformations and stresses between the surrounding rock and tunnel lining were directly related to construction processes, geophysical conditions, and super-span tunnel positions.…”

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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“…Li et al (2021) established a microseismic (MS) monitoring system and performed numerical simulation based the discrete element method (DEM) to investigate the stability of rock mass in high geostress underground powerhouse caverns subjected to excavation. Liu et al (2020) taken the Badaling Great Wall station in Beijing as the engineering background, a typical monitoring section was selected in the super-span transition section of the tunnel and the deformation and forces of both the surrounding rock and the support structures were systematically monitored. The results showed that the deformation and the forces acting on both the surrounding rock and the tunnel's lining are directly related to the construction procedures, the geological conditions and the locations in the super-span tunnel.…”

Section: Introductionmentioning

confidence: 99%

Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slate

Niu

Wang²,

Fan³

2023

Front. Earth Sci.

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Affected by dip angle and thickness of strata and the tunneling method, soft rock tunnel has obvious characteristics of large deformation, long deformation time and difficult support. Based on a case study of Gelong the deformation and failure mechanism of surrounding rock, stress characteristics of supporting structural and control method of large section highway tunnel passing through strong-medium weathered carbonaceous slate stratum are studied. This paper proposed construction method based on strengthening the longitudinal stiffness of supporting structure and increasing the integrity of surrounding rock, The results showed that the deformation of surrounding rock and the stress of supporting structure increased rapidly in the early stage of construction. The cumulative deformation of vault settlement and horizontal convergence reached 116.9 mm and 97.9 mm, respectively, accounting for 73.53% and 76.62% of the total deformation. The proportion of surrounding rock pressure shared by the primary support and the secondary lining was about 8.9:1.1. This shows that the initial support after comprehensive reinforcement has a strong supporting capacity, and effectively reduces the secondary lining pressure of the tunnel, which plays a vital role in the long-term service of the secondary lining.

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Field Monitoring of the Deformation and Internal Forces of the Surrounding Rock and Support Structures in the Construction of a Super-Span High-Speed Railway Tunnel—A Case Study

Cited by 12 publications

References 18 publications

Mechanical Behavior of Secondary Lining in Super Large-Span Tunnels Considering Temperature Effects

Mechanical Behavior of Secondary Lining in Super Large-Span Tunnels Considering Temperature Effects

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

Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slate

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