Study on Harbin Metro Shield Tunnel Segment and the Deformation of Tunnel Rock

Yang, Yue; Chen, Xiao Guo

doi:10.4028/www.scientific.net/amm.405-408.1297

Cited by 3 publications

(4 citation statements)

References 1 publication

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“…At the stage of main structure construction, the existing tunnel is consistent with the previous stage without significant horizontal displacement. Similar to vertical displacement, this measurement result is consistent with the research conclusions of Yang et al [40], Zheng et al [41], and Meng et al [42]. At the stage where the right line shield crosses the existing line tunnel, the 500-545 rings exhibit significant displacement away from the foundation pit, with a maximum value at the 528 ring and a displacement value of 3.80 mm.…”

Section: Analysis Of Monitoring Data Of Existing Tunnelssupporting

confidence: 89%

“…Ding et al [39] concluded that the influence of shield crossing on an existing tunnel is mainly due to uplift deformation and that the deformation curve is parabolic based on field measurement data. Yang et al [40] analyzed the influence of a shield on an existing tunnel and stratum in the shield tunneling process under different stratum loss rates through numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

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Multiple Disturbances of Existing Tunnels Caused by Deep Excavation and New Shield Tunnel

Li,

Ye,

et al. 2023

Advances in Civil Engineering

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With the continuous development of urban underground spaces, new underground engineering approaches are becoming more similar to existing operating tunnels. Existing research is typically concerned with the impact of a single project, such as a new tunnel or deep excavation, on existing shield tunnels. There are few studies on the influence of both excavation and overcrossing tunneling on operational tunnels. Taking a section ranging from the Chengzhan Station to the Jiangcheng Road Station of Hangzhou Metro Line 7 as a case study, this study analyzes the automatic monitoring data of the existing tunnel within this section. Through data analysis, the influences of deep excavation and shield tunneling on the vertical settlement, horizontal displacement, segment convergence, and differential settlement of the tunnel ballast of the adjacent existing line segment are assessed. The influence of deep excavation and overcrossing tunneling on multiple disturbances of existing line tunnels is summarized. This study will be useful for similar projects involving deep excavation next to existing tunnels and overcrossing tunneling, as it will help clarify the protection range of existing lines and determine the displacement alarm value of existing structures.

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Section: Analysis Of Monitoring Data Of Existing Tunnelssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Multiple Disturbances of Existing Tunnels Caused by Deep Excavation and New Shield Tunnel

Li,

Ye,

et al. 2023

Advances in Civil Engineering

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“…The paper used MIDAS/GTS software to establish a 3D numerical model, the majority of single-track subway tunnels are around 6 m in diameter (Yang, 2017), so the diameter of the small cross-section tunnel is taken as 6 m. Figure 4 illustrates the model (with m is 2 and n is 2), the large section tunnel has a diameter of 8.80 m. Given to which degree the tunnel excavation influences the surrounding rock (Yang, 2017;Lu et al, 2019;Yu et al, 2019), the lengths of the X, Y, and Z direction are 96 m, 120 m, and 60 m respectively, where the Y direction stands for the tunnel excavation direction. The small section tunnel has a burial depth of 20 m. The distance between the excavation faces is 36 m and the step method is adopted for tunnel excavation.…”

Section: Finite Element Mesh and Model Parametersmentioning

confidence: 99%

Prediction for the surface settlement of double-track subway tunnels for shallow buried loess based on peck formula

et al. 2023

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In the process of constructing double-track subway tunnels in shallow buried loess areas, the interaction of double-track tunnels is significantly influenced by the net distance and the cross-section size, which is challenging to control the surface settlement. Therefore, the surface settlement prediction is essential while constructing double-track subway tunnels in shallow buried loess areas. The paper analyzed the surface settlement law of shallow buried double-track tunnels in loess areas through theoretical research and numerical simulation. The research results show that with the decrease of the net distance, the surface settlement superimposed curve was double V shape -W shape - single V shape. When the superimposed curve is double V shape and W shape, the Peck formula was used to calculate the surface settlement curve of the single-track tunnel, then superimposed to obtain the final surface settlement curve. When the superimposed surface settlement curve was V shape, based on the Peck formula, the formula for predicting the surface settlement suitable for symmetry and asymmetry was established. The net distance ratio and the area ratio were defined, and considering the tunnel’s interaction, the value and position of the maximum were corrected. Then numerical tests were carried out 16 times with different net distance ratios and area ratios, to determine the parameters of increments and position offsets of the maximum regarding the net distance ratio and the area ratio. Finally, two engineering were conducted for verifying the rationality and applicability exhibited by the prediction formula. The prediction formula served for predicting the surface settlement of double-track subway tunnels in shallow buried loess areas. Which can reduce construction risks and assure the safety of buildings above the ground.

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“…The diameter of the cutter head of a shield tunneling machine is generally slightly larger than the outer diameter of the shield shell. In the full section surrounding rock strata, there will be a gap between the surrounding rock and the shield shell after shield excavation [1]. Due to the relatively stable surrounding rock strata, this gap exists for a long time, which induces grout flow toward the excavation face occurs, causing construction risks to the shield tunneling construction.…”

Section: Introductionmentioning

confidence: 99%

Study on the escaping condition of backfill grouting based on two-phases flow for shield tunnelling during whole section rock

Zhu,

Ji,

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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During the process of full section surrounding rock shield tunneling, the occurrence of synchronous grout escaping can seriously affect the assembly quality of the detached shield tail segment ring. The segment is prone to quality accidents such as floating, misalignment of the tunnel pipes, and even cracking, and even a large number of rock fractures in the shield tail gap mix with water flow towards the excavation face and pressure chamber, leading to frequent fissure water gushing out of the screw conveyor. Taking the shield tunnelling section of Nanjing Metro Line 6 as the engineering background, this paper uses the finite element software Ansys Fluent to establish the two-phases flow shield tail escaping grout model, and analyzes the influence laws of the grout properties, grouting pressure difference, grouting escaping thickness and other factors in the process of grout escaping behind the shield tail wall based on Bingham fluid. The results show that the amount of synchronized grout escaping increases linearly with the increase of grouting pressure difference and grouting escaping thickness, and decreases with the increase of grout shear yield stress. The paper also discusses the three-dimensional curved surface of grout escaping volume, grouting pressure difference and grouting fluid properties behind shield tunnel tail in a full section surrounding rock shield project of Nanjing Line 6, and gives the measures to prevent grout escaping when the allowable grout escaping volume is not more than 1m3: when the grouting escaping thickness is 20mm, the grouting pressure difference should be controlled within 0.20∼0.25MPa, and the shear yield stress of the grouting fluid should be controlled within 300∼350Pa.

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Study on Harbin Metro Shield Tunnel Segment and the Deformation of Tunnel Rock

Cited by 3 publications

References 1 publication

Multiple Disturbances of Existing Tunnels Caused by Deep Excavation and New Shield Tunnel

Multiple Disturbances of Existing Tunnels Caused by Deep Excavation and New Shield Tunnel

Prediction for the surface settlement of double-track subway tunnels for shallow buried loess based on peck formula

Study on the escaping condition of backfill grouting based on two-phases flow for shield tunnelling during whole section rock

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