3d-Fem Analysis of Shield Tunnel Construction With Ground-Spring Model

Chaipanna, Pattanasak; Jongpradist, Pornkasem

doi:10.21660/2017.31.6536

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…Moreover, evidence had shown that Stone Age people, Egyptian, Romans and other civilizations had developed different tunneling technologies to obtained metals and gold [1,2]. With modern excavation tools and analysis techniques both soil and rock tunneling has become an inevitable part of smart cities [3,4]. Researchers have studied the response of tunnels due to internal and external loadings [5,6].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Opening Shapes on the Stability of Underground Tunnels: A Finite Element Analysis

Alsabhan

Sadique²,

Ahmad³

et al. 2021

GEOMATE

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Tunnel construction and development has long been an important component of smart cities and modern sustainable development projects around the world. Despite major advances in tunneling technologies, tunneling in rocks remains one of the most mammoth tasks for a geotechnical engineer to complete. Nowadays, all new complex and significant structures are designed and analyzed through finite element techniques. In the present study, numerical simulations have been carried out using the finite element code ABAQUS. Around the tunnel, a specified region of rock mass has been discretized into about 34000 elements. The Continuum Three Dimensional Eight Nodded Reduced integrated (C3D8R) elements were used to model the Tunnel. The effect of the shape of tunnel opening has been studied in three dimensional models using the Elastic Approach Solution Technique. A circular, oval, horse-shoe and square opening of a tunnel have been analyzed. In the current investigation, the behavior of flat head tunnels was also taken into account for comparison purposes. The crown of a flat head and round tubes of equivalent dimensions have shown the most deformation. On the other side, the oval shape has been found to have the fewest deformations at the crown of the opening. Furthermore, the horse-shoe opening, which is the most commonly used tunnel opening shape, has somewhat higher distortion than the oval opening.

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Section: Introductionmentioning

confidence: 99%

The Effect of Opening Shapes on the Stability of Underground Tunnels: A Finite Element Analysis

Alsabhan

Sadique²,

Ahmad³

et al. 2021

GEOMATE

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Prediction of the additional structural response of segmental tunnel linings induced by asymmetric jack thrusts

Shi

Wang

Gong

et al. 2022

Tunnelling and Underground Space Technology

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Effect of Jack Thrust Angle Change on Mechanical Characteristics of Shield Tunnel Segmental Linings Considering Additional Constrained Boundaries

Li¹,

Jiang

Zhang

2022

Applied Sciences

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With the attitude adjustment of shield machine, the jack thrust angle will change and may lead to great damage to segmental lining structures. In this paper, a three-dimensional refined finite element method is proposed to study the action mechanism and influence of jack thrust angle change on the mechanical characteristics of shield tunnel, considering additional constrained boundaries formed by various construction loads. Firstly, the finite element method is established and verified. Then, a series of analyses is carried out to investigate the mechanical performance of a certain tunnel lining with eleven rings under conditions of different jack thrust angles. An in-depth discussion is conducted on the obtained displacement, deformation, and stress distribution. A quantitative standard is finally gained for controlling the jack thrust angle. The results show that the maximum segment displacement occurs at the lower part of the arch waist of the second ring out of the shield tail, which has little relationship with the attitude adjustment. With the increase of the jack thrust angle, the maximum offset between the rings increases linearly, which is not conducive to the safety of the lining structures. The development direction of the tunnel displacement is opposite to that of the jack thrust deflection. The displacement of the tunnel is most affected by the jack thrust deflection when the shield machine is upward, which is also the most unfavorable situation for the segmental linings. The results in this paper provide novel insights into the effect of jack thrust on shield tunnel.

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3d-Fem Analysis of Shield Tunnel Construction With Ground-Spring Model

Cited by 3 publications

References 5 publications

The Effect of Opening Shapes on the Stability of Underground Tunnels: A Finite Element Analysis

The Effect of Opening Shapes on the Stability of Underground Tunnels: A Finite Element Analysis

Prediction of the additional structural response of segmental tunnel linings induced by asymmetric jack thrusts

Effect of Jack Thrust Angle Change on Mechanical Characteristics of Shield Tunnel Segmental Linings Considering Additional Constrained Boundaries

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