Numerical simulation of deformation influence of foundation pit excavation on shield tunnel under support structures

Li, Senyu; Liu, Wenzhao; Huang, Zhi‐Tang; Liu, Genshen; Xie, Shusen

doi:10.1201/9781003344209-40

Cited by 2 publications

(2 citation statements)

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“…What is more, since the safety risk management and environmental protection policies are getting stricter in China [13,14], the application of the drilling-blasting method will be gradually restricted, especially for roadway excavation in the ecologically fragile area of China, for example, in Xinjiang and Tibet. The rock breaking and roadway excavation method has been proven in recent years, such as using air-water coupling blasting [15], water jet-assisted rock breaking [16], hydraulic fracturing [17], and so on, but these technologies have a huge of water consumption, which is not in line with the principle of environmental friendly operating standards.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Preliminary In Situ Investigation on Roadway Excavation Using Static Expansion Mechanical Fracturing

Chen,

Li,

Zhao

et al. 2024

Advances in Civil Engineering

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This paper introduced a new nonexplosive roadway excavation method, combining the reserved free space technology and the static expansion mechanical fracturing technology, where the former is implemented by the gasbag, while the piston splitter is for the latter. The numerical model of roadway excavation was set up via PFC3D to investigate the mechanical fracturing performance, including the single-hole fracturing and the hole network fracturing. The results show that the reasonable hole margin is about 1.0–1.5 m, and the optimal column spacing of the hole network pattern is 1.0 m, after comprehensively analyzing the fracturing performance and the splitting force evolution. Moreover, the mechanical fracturing excavation method was applied to construct a parking chamber in the Kalatongke Mine, to preliminarily verify the feasibility of the static expansion mechanical fracturing technology. The in situ investigation results indicate that the excavation footage is about 0.8 m with the piston splitter when adopting a hole margin of 1.0–1.5 m. To sum up, the preliminary field application and the numerical simulation result both support the feasibility of mechanical fracturing, and the reasonable fracturing hole margin is about 1.0 m.

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Section: Introductionmentioning

confidence: 99%

Numerical and Preliminary In Situ Investigation on Roadway Excavation Using Static Expansion Mechanical Fracturing

Chen,

Li,

Zhao

et al. 2024

Advances in Civil Engineering

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“…Finite element analysis combined with specific examples is commonly used to comprehensively analyze and verify the structural strength and stiffness [1][2][3], with a specific focus on the deformation [4,[7][8] and safety [5,[9][10] of support structures. International research emphasizes simulation analysis [11], utilizing simulation software combined with on-site data collection techniques to recreate tunnel conditions [6,12]. Simulation analysis of models focuses on optimizing the design of tunnel support structures to enhance construction safety and reliability [13][14].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study of Midas-Based Tunnel Section Structural Forces and Deformations

2024

HSET

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The burial depth significantly influences the structural forces and deformations of tunnel sections, playing a crucial role in the safe operation of tunnels. This study focuses on the structural design and deformation analysis in underground tunnel engineering. Utilizing Midas modeling techniques, tunnel models were designed for experimentation to comprehensively explore the impact of tunnel burial depth and key design parameters on structural deformations and safety.(1) The research reveals that design parameters such as tunnel diameter are the dominant factors affecting deformation, lining pressure, and structural displacement.(2) With an increase in tunnel diameter, substantial deformation occurs, and the lining pressure distribution evolves from a "fan-shaped" pattern to a "peach-shaped" pattern. The bottom structure transitions from uplift to slight settlement. (3) The study results provide a rational range of parameter values for tunnel design. Simulation outcomes highlight areas with higher deformation, offering insights for proposing corresponding remedial measures.

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Numerical simulation of deformation influence of foundation pit excavation on shield tunnel under support structures

Cited by 2 publications

References 0 publications

Numerical and Preliminary In Situ Investigation on Roadway Excavation Using Static Expansion Mechanical Fracturing

Numerical and Preliminary In Situ Investigation on Roadway Excavation Using Static Expansion Mechanical Fracturing

Numerical Simulation Study of Midas-Based Tunnel Section Structural Forces and Deformations

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