An Approach to Determine the Stiffness Reduction Factor of Tunnel Lining

Zhou, Hai Ying; Li, Lixin; Chen, Ting Guo

doi:10.4028/www.scientific.net/amr.243-249.3659

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…The reduction factors of the stiffness of the lining ring with only grooves, only holes, and both grooves and holes compared to a homogeneous ring are 0.88, 0.99, and 0.84, respectively. The results show that the influence of only drilling holes on the structural stiffness is negligible, and the reduction factor of the ring with both grooves and holes, which is finally used in the tests, is within the range of previous research results of 0.2 to 0.9 [26], demonstrating the reasonability of the joint simulation method.…”

Section: Stiffness Characteristics Of Model Segmental Lining Ringsupporting

confidence: 72%

Centrifugal Model Test Study on the Mechanical Characteristics of Shield Tunnels Influenced by Different Types of Openings for Cross Passages

Yuan

Luo

et al. 2022

Applied Sciences

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To investigate the mechanical characteristics of shield tunnels when openings are made for the construction of cross passages, a series of centrifugal model tests were conducted. The segmental features of the shield tunnel were simulated in the tests, and the influence of different types of openings, namely, rectangular opening, small circular opening, and big circular opening was compared. External earth pressures, structural deformations, dislocations, and structural stresses were monitored during the tests, while the influence of different buried depths was also investigated. The results show that (1) soil arching effect occurred in the overlying soil due to the deformation of the tunnel, and the earth pressure reduction coefficients can guide the tunnel structural design; (2) vertical deformations of the main tunnel and the dislocations between adjacent rings increased with the opening sizes significantly; (3) significant stress concentration occurred close to the openings, and the compressive stress at the inner surface may even exceed the limit strength of the concrete. In summary, the adverse responses of the tunnel increased with the increase of the buried depth and the opening size. Targeted measures should be taken, such as temporary support, longitudinal connections, and high-strength materials near the openings.

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Section: Stiffness Characteristics Of Model Segmental Lining Ringsupporting

confidence: 72%

Centrifugal Model Test Study on the Mechanical Characteristics of Shield Tunnels Influenced by Different Types of Openings for Cross Passages

Yuan

Luo

et al. 2022

Applied Sciences

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“…The shield tunnel joints’ influence on the stiffness of the tunnel can be considered through stiffness reduction. According to the equivalent continuity model and stiffness calculation equation of the shield tunnel proposed by Zhou, et al [ 26 ], the reduction factor of the shield tunnel segment was calculated as 0.88. The segments were made of C30 grade concrete, and the elastic modulus E, Poisson’s ratio, and gravity were 25.9 GPa, 0.2, and 25 kN/m 3 , respectively.…”

Section: Engineering Example Verificationmentioning

confidence: 99%

Calculation of additional load and deformation of the receiving well enclosure structure caused by shield tunneling

xin,

Chen,

et al. 2024

PLoS ONE

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The bulkhead additional thrust during shield tunneling, the force of friction between shield and soil, and the additional grouting pressure can cause additional stress in the surrounding soil, thereby disturbing existing buildings and structures. However, few studies focused on the disturbance situation when the shield tunneling machine approaches the receiving well. If the additional stress and deformation of the receiving well are too excessive, it could result in the collapse of the receiving well. Based on the two-stage method, this study derived the calculation formula of the additional stress and deformation of the receiving well enclosure structure caused by shield tunneling. Taking a shield machine receiving engineering as the context, this study established a numerical simulation model and compared theoretical calculation, the results of numerical simulation model and on-site monitoring data. Finally, the additional stress of the receiving well is analyzed. The research findings demonstrate that the theoretical prediction results, numerical simulation calculation results, and on-site monitoring data exhibit relatively small calculation errors, which validated the applicability of the theoretical prediction formula and numerical simulation model. As the distance between the shield machine and the receiving well decreases, the disturbance to the receiving well increases sharply. When the distance between the cutter head and the receiving well is less than three times the shield length, it is crucial to enhance the deformation monitoring of the receiving well. The primary factors affecting the additional load and deformation of the receiving well enclosure structure are the force of friction between shield and soil and the additional thrust of the cutterhead. The disturbance caused by the additional grouting pressure on the enclosure structure can be ignored.

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Centrifugal model tests on the structural response of the shield tunnel when constructing cross passages by mechanical methods

Yuan²,

Jin³

et al. 2022

Tunnelling and Underground Space Technology

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An Approach to Determine the Stiffness Reduction Factor of Tunnel Lining

Cited by 3 publications

References 5 publications

Centrifugal Model Test Study on the Mechanical Characteristics of Shield Tunnels Influenced by Different Types of Openings for Cross Passages

Centrifugal Model Test Study on the Mechanical Characteristics of Shield Tunnels Influenced by Different Types of Openings for Cross Passages

Calculation of additional load and deformation of the receiving well enclosure structure caused by shield tunneling

Centrifugal model tests on the structural response of the shield tunnel when constructing cross passages by mechanical methods

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