Study of the collapse mechanism of shield tunnels due to the failure of segments in sandy ground

Zheng, Gang; Cui, Tingwei; Cheng, Xuesong; Diao, Yu; Zhang, Tianqi; Sun, Jibin; Ge, Longbo

doi:10.1016/j.engfailanal.2017.04.030

Cited by 82 publications

(31 citation statements)

References 30 publications

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“…Ye et al [4] and Huang et al [26] improved the method to consider the deformation features of a joint when a load was applied to the joint. Zheng et al [37] proposed the formula for the additional deformation Δl b of the bolt and the relative rotation angle θ of two adjacent segments, and they deduced the similarity relationships between the prototype and the model bolt, which are expressed as follows:…”

Section: Similarity Relationships Of the Segmentmentioning

confidence: 99%

“…e type of model bolt must satisfy the segment assembly requirements and the geometric and elastic modulus similarities. Considering the results of the bolt tension tests in Zheng et al [37] and based on the elastic modulus similarity constant C E s � 20.4 and the geometric similarity constant C L � 20, the value of (E b • A b /l b ) m can be calculated using equation ( 5 10 8 N/m. We decided that an aluminium wire (type 1060) was suitable for a secondary processing material and had a small size that fit the size of the segment.…”

Section: Bolt Selectionmentioning

confidence: 99%

“…e model tank was the same as the other tank. e rigid steel tank was 1800 mm wide, 1900 mm high, and 1080 mm thick, and it contained two 20 mm plexiglass windows [37], as illustrated in Figure 6. e model tunnel was laid horizontally in the middle of the model box.…”

Section: Model Boxmentioning

confidence: 99%

“…Dry fine sand was used for the model test; the sand was the same as that used by Zheng et al [37]. e falling height was kept at 300 mm above the soil surface prior to testing.…”

Section: Fine Sandmentioning

confidence: 99%

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Experimental Research on the Transverse Effective Bending Rigidity of Shield Tunnels

Zheng

Lei

Cui

et al. 2019

Advances in Civil Engineering

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The uniform rigidity ring model is commonly used to design the segmented structures of shield tunnels. However, model tests have been primarily used to study the transverse effective rigidity ratio η with a concentrated force, which is notably different from realistic loading patterns. To obtain more reasonable η values, in this study, tests were performed with a concentrated load on an experimental bench and with a realistic loading pattern in sandy soil in a rigid steel tank. Three types of segmental ring models were designed and tested: straight-jointed, stagger-jointed, and uniform rings. The test results indicated that the η values of the stagger-jointed assembly mode were clearly larger than those of the straight-jointed assembly mode under both loading patterns. η increased as the load increased under the realistic loading conditions, whereas η decreased as the load increased under the concentrated load. More importantly, the η values derived from the realistic load tests were considerably larger than those derived from the concentrated load tests for both assembly modes (i.e., 0.423–0.672 and 0.587–0.761 for the straight-jointed and stagger-jointed assembly modes, respectively), and the former should be recommended for practical engineering applications. Furthermore, formulas relating η to the ratio of the cover depth to the tunnel diameter were proposed for sandy soil.

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Section: Similarity Relationships Of the Segmentmentioning

confidence: 99%

Section: Bolt Selectionmentioning

confidence: 99%

Section: Model Boxmentioning

confidence: 99%

“…Dry fine sand was used for the model test; the sand was the same as that used by Zheng et al [37]. e falling height was kept at 300 mm above the soil surface prior to testing.…”

Section: Fine Sandmentioning

confidence: 99%

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Experimental Research on the Transverse Effective Bending Rigidity of Shield Tunnels

Zheng

Lei

Cui

et al. 2019

Advances in Civil Engineering

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“…The sandy layer can cause severe damage to underground projects [1][2][3]. Grouting is a common method of soil reinforcement in underground engineering and has been playing an important role in treating the sand layer [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Modified Maag’s Spherical Diffusion Model of Vacuum Penetration Grouting

Feng

Lyu

Gao

et al. 2018

Mathematical Problems in Engineering

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The penetration grouting is very widely used in geotechnical engineering nowadays, but the slurry diffusion radius is not long enough because of low grouting pressure. The vacuum grouting method is proposed to solve this problem. However, there is no diffusion theory model of vacuum grouting, which makes the practical application lack scientific basis. In this paper, the distribution law of vacuum negative pressure in soil is deduced. Then, the boundary conditions of Maag's spherical diffusion model are modified by the vacuum pressure distribution law. After that, the vacuum modification model is deduced. Finally, Maag's model and modified model are analyzed according to a published experiment, which proves that the vacuum modification model is suitable for predicting the slurry diffusion of vacuum grouting. The proposed model provides a reference for the theoretical study of vacuum grouting.

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Mechanical Properties of Segment Joints in Subway Shield Tunnels by a Full-Scale Test

Li,

Feng,

Gao

et al. 2024

Lecture Notes in Civil Engineering

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Study of the collapse mechanism of shield tunnels due to the failure of segments in sandy ground

Cited by 82 publications

References 30 publications

Experimental Research on the Transverse Effective Bending Rigidity of Shield Tunnels

Experimental Research on the Transverse Effective Bending Rigidity of Shield Tunnels

Modified Maag’s Spherical Diffusion Model of Vacuum Penetration Grouting

Mechanical Properties of Segment Joints in Subway Shield Tunnels by a Full-Scale Test

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