Study on inner force and dislocation of segments caused by shield machine attitude

Mo, Hongqiang; Chen, J.S.

doi:10.1016/j.tust.2007.06.007

Cited by 108 publications

(36 citation statements)

References 4 publications

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“…Therefore, the transferred force FR,B is limited by the maximum tangential stress that packers can resist before slipping (τsl), which depends on the existent normal compression stress (σp). According to this phenomenon, several researches have indicated the necessity of properly considering the longitudinal force present at a tunnel lining in order to adequately reproduce its three dimensional response (Blom et al, 1999;Mo and Chen, 2008). The transfer of tangential forces from the loaded ring (FR) produces the deformation of the adjacent ones, originating the longitudinal deformation profile shown in figure 4.…”

Section: Interaction Mechanisms Under Localized Loadsmentioning

confidence: 99%

Theoretical and numerical analysis of the three-dimensional response of segmental tunnel linings subjected to localized loads

Arnau

Molins

2015

Tunnelling and Underground Space Technology

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Segmental tunnel linings present a significant 3D response when they are subjected to localized loads or to other scenarios that produce different deformations of adjacent rings. The present paper analyzes the interaction mechanisms mobilized in such conditions, determining the most influence parameters and their repercussion on the structural response of the lining. A complete set of numerical analyses is carried out on a complex 3D numerical model that accurately reproduces a real tunnel section on multiple scenarios. Numerical results show the structural benefits of the lining three-dimensional response when subjected to localized loads, allowing the determination of the influence presented by the main involved parameters. The surrounding ground stiffness determines the interaction degree achievable between adjacent rings, whilst lining longitudinal compression determines the maximum load for which a complete interaction is produced.

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Section: Interaction Mechanisms Under Localized Loadsmentioning

confidence: 99%

Theoretical and numerical analysis of the three-dimensional response of segmental tunnel linings subjected to localized loads

Arnau

Molins

2015

Tunnelling and Underground Space Technology

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“…Xin et al have investigated the tension and compression stress and the damage mode for the proportional tunnel model, respectively, with and without lining headspace by conducting research on the dynamic behavior of tunnel structure based on shaking table [8]. Mo and Chen have conducted numerical simulations for segment cracks during construction and service stage by software ADINA and ANSYS, respectively, and have analyzed the expansion law of the cracks in the vicinity of bolt hole; then, the corresponding method has been put forward on the promotion of crack resistance property for concrete [9,10]. He and Liu have illuminated the effect of different crack numbers, length, and position on the structural mechanical property of segment in shield tunnel [11,12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Influence of Regional Concrete Spalling on Shield Tunnel Segments

Wang

Liu

et al. 2019

Advances in Civil Engineering

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Based on the field investigation and analysis, the mechanical characteristics of segment structure in shield tunnels are compared and analyzed under the circumstances of different concrete spalling region by the method of similarity model experiment. Through data analysis of acoustic emission, the results for displacement and internal force of shield tunnel segments are clarified on the segment lining, the influential rule of load bearing capacity is also determined, and the deformation and stress for the different concrete spalling region are described as well. The corresponding research results indicate that range for elastic bearing stage is enlarged while it is narrowed for plastic bearing stage, the convergence and deformation and the accumulated event numbers for acoustic emission on critical instability point are obviously increasing, and the process of damage and failure tends to be sudden for segment lining structure. The ultimate bearing capacity of the damaged segment lining obviously decreases due to regional concrete spalling; to be more specific, the reduction rate for ultimate bearing capacity becomes 6%, 6%, and 13%, respectively, when the range of concrete spalling reaches 45°, 60°, and 75°.

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“…These analyses take into account the steps of tunnel construction, but the tunnel lining is commonly modeled by means of continuous ring. Katebi et al, [7] and Blom et al, [8] model tunnel lining by segmental lining, but the surrounding soil is characterized by elastic medium which is not rational to represent the actual soil behavior.…”

Section: Introductionmentioning

confidence: 99%

“…Although, it is commonly realized that the effect of the tunnel construction loads on the tunnel lining must be taken into account in the analysis and design of shield tunnels, only few research has been carried out to grasp the effect of tunnel construction loads [5], [6]- [8]. This paper presents a threedimensional analysis model to enhance the appreciation of tunnel lining behavior due to the construction loads.…”

Section: Introductionmentioning

confidence: 99%

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

Chaipanna¹,

Jongpradist²

2017

GEOMATE

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ABSTRACT:The shield tunneling has been extensively implemented for construction of underground transportation systems in urban areas. Reports on tunnel segment damage during tunnel construction become increasing. The jack thrust force is the essential cause of damage to the segment. The objective of this article is to present the model which analyzes the behavior of tunnel lining during construction. The model consists of five rings and ten segments for each ring connected together with the shear springs which represent the segment joints and ring joints. The zero thickness interface elements are used to model the segment interface behavior and soil stiffness is represented by mean of ground springs. All relevant construction loads are taken into account in the analysis. The ground spring model is implemented into FEM program ABAQUS to analyze the behavior of segmental lining during construction along straight and curve alignments. The analysis results agree with the measurement data and confirm that the stresses of tunnel segments are governed by jack thrust force. The ground-spring model has been proven to be appropriate for analysis of behavior of the tunnel segments.

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Study on inner force and dislocation of segments caused by shield machine attitude

Cited by 108 publications

References 4 publications

Theoretical and numerical analysis of the three-dimensional response of segmental tunnel linings subjected to localized loads

Theoretical and numerical analysis of the three-dimensional response of segmental tunnel linings subjected to localized loads

Experimental Investigation on the Influence of Regional Concrete Spalling on Shield Tunnel Segments

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

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