The Effect of Excavation Unloading on the Deformation of Existing Underlying Shield Tunnel

Hu, Minyun; Yang, Jingtian; Pan, Lidong; Kong-shu, Peng; Lü, Yaping

doi:10.1007/978-3-030-77238-3_10

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…Construction activities near operational subways are likely to induce stress changes and soil deformation, potentially compromising the structural integrity of the subway system [9]. In particular, simultaneous construction projects around an existing tunnel can cause multiple disturbances.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of the Numerical Simulation and Measured Data of an Existing Tunnel Subjected to Multiple Disturbances: A Case Study

Li,

Ye,

Han

et al. 2024

Applied Sciences

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As urban underground spaces continue to develop, new engineering projects are increasingly closer to existing operating tunnels. This study focuses on the impact of excavation work, such as a new tunnel or deep excavation, on an existing shield tunnel. However, few studies have examined the simultaneous effects of excavation and over-crossing tunneling on operational tunnels. This paper presents a case study of Section 2 of Hangzhou Metro Line 7, employing MIDAS GTS to simulate the settlement of the existing tunnel and analyze the data collected through automatic measurements. Both methods demonstrated that excavating a foundation pit near the existing tunnel results in the tunnel’s settlement while over-crossing tunneling of the new tunnels leads to the uplift of the existing tunnel. The excavation prompted the existing tunnel to move horizontally toward the foundation pit, whereas over-crossing tunneling pushed it horizontally away. The numerical simulation revealed minor vertical displacement but significant horizontal displacement, aligning closely with the measured data. The impacts of foundation pit excavation and over-crossing tunneling on the vertical and horizontal displacement of existing tunnels are contrary, suggesting that the two construction stages will offset each other.

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Section: Introductionmentioning

confidence: 99%

Comparative Analysis of the Numerical Simulation and Measured Data of an Existing Tunnel Subjected to Multiple Disturbances: A Case Study

Li,

Ye,

Han

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…The stress change and soil deformation caused by construction activities near the operation line are likely to have adverse effects on the subway structure. In terms of engineering, many studies have shown that improper construction leads to excessive displacement, deformation, segment damage, and even engineering accidents in adjacent subway tunnels [3][4][5][6][7]. Some scholars have also proposed quantitative analysis and evaluation approaches for possible damage to existing tunnels [8].…”

Section: Introductionmentioning

confidence: 99%

“…3 Þ Cohesion, c (kPa) Angle of friction, φ (°) Soil thickness (stable position. The total station adopts a fixed instrument table for 24-hr automatic measurements and is supplemented by manual retesting.…”

mentioning

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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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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Evolution of tunnel uplift induced by adjacent long and collinear excavation and an effective protective measure

Zhao

Chen

et al. 2023

Tunnelling and Underground Space Technology

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The Effect of Excavation Unloading on the Deformation of Existing Underlying Shield Tunnel

Cited by 3 publications

References 5 publications

Comparative Analysis of the Numerical Simulation and Measured Data of an Existing Tunnel Subjected to Multiple Disturbances: A Case Study

Comparative Analysis of the Numerical Simulation and Measured Data of an Existing Tunnel Subjected to Multiple Disturbances: A Case Study

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

Evolution of tunnel uplift induced by adjacent long and collinear excavation and an effective protective measure

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