2D numerical investigation of segmental tunnel lining behavior

Anh, Ngoc; Dias, Daniel; Oreste, Pierpaolo; Djéran-Maigre, Irini

doi:10.1016/j.tust.2013.03.008

Cited by 176 publications

(88 citation statements)

References 16 publications

(15 reference statements)

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“…HRM Method [1], [16]- [18] Method HRM is a direct method. This is part of the numerical method, method HRM used to Matlab program to construction model of tunnel lining and environment ground surrounding tunnel [16]- [17]. This method simulates the interaction between the lining and ground surrounding the tunnel through a number of independent "Winkler" type springs.…”

Section: B Penzien's Methods [11]-[12]mentioning

confidence: 99%

Influence of Segmental Joints in the Segmental Circular Tunnel Lining under the Impact of Earthquakes

Alexandr¹,

Nguyen²

2017

IJET

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-At present, the underground construction system is developing very strongly in the world and in Vietnam. In particular, the metro tunnel system was developed very rapidly due to its ability to serve in the urban transport system. Most tunnels in the metro system today use the segmental tunnel lining, which has segmental joints in the segmental tunnel lining due to its advantages. Tunnels these have circular cross section are very popular in metro tunnels system. In this paper, the methods of calculating the impact of earthquake on tunnels lining in the case of the tunnel has lining continuous or segmental (with segmental joints between segments of lining tunnel) have been used to comparisons of internal forces, displacement of tunnel lining in two cases under the impact of earthquake and comments about effects of segmental joints in the segmental tunnel lining. This paper is used as a case study for the Hanoi metro tunnel.Keyword -Tunnel, segmental lining, earthquake, joints, effect, earthquake. I. INTRODUCTION At present, tunnels for transportation and infrastructure are developing rapidly in the world and Viet Nam. Due to these tunnels's characteristics, tunnels may be heavily influenced by earthquakes that could impact to the area, where tunnels are located. There are many methods of calculating the impact of earthquakes to tunnels, such as methods of Wang, Pezien and Wu.... However, these methods have disadvantages such as: considering the environment the rock surrounding the tunnel and the tunnel lining are models that operate in linear elastic state, the tunnel lining is continuous.In actually design, construction of tunnels, the segmental tunnel lining could be used to tunnels, especially with tunnels under the impact of earthquakes. In the literature, effects of segmental joints on the tunnel lining are usually considered in both indirect methods and direct methods. With indirect methods are concerned, the tunnel lining is perceived as a rigid lining ring embedded on a continuous ground model, to consider the segmental lining as a continuous ring with a reduced rigidity by applying a reduction factor, η, to the bending rigidity (EI) of the tunnel lining [1]: where (EI) eq is the bending stiffness of the tunnel segmental lining, (EI) is the bending stiffness of the continuous lining (Muir Wood, Einstein và Schwartz, Takano, Oreste) [2]- [5]. The effect of joints in the tunnel lining taken into calculation through a reduced rigidity of the tunnel lining. The ground-structure interaction is usually considered by means of so-called bedded ring models, in which the ground reaction is taken into consideration by means of discrete springs according to Winkler's theory. In direct methods, segmental joints has been added directly to the tunnel lining (Lee et al, Blom, Ding et al, Naggar) [6] - [9]. In Ding et al method, has got effects of three joint stiffnesses to the tunnel lining, these be the rotational stiffness, the axial stiffness and the radial stiffness. But in this method not could calculatio...

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Section: B Penzien's Methods [11]-[12]mentioning

confidence: 99%

Influence of Segmental Joints in the Segmental Circular Tunnel Lining under the Impact of Earthquakes

Alexandr¹,

Nguyen²

2017

IJET

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“…The tunnel lining parameters are presented in Table 2. The stiffness parameters of the joint connection were taken into consideration by means of a set composed of a rotational spring (K  ), an axial spring (K A ), and a radial spring (K R ) (Do et al, 2013;2014a;2014b;2014c). Similarly, the rigidity characteristics of the ring joint connection were represented by a set A total weight of 3980 kN was simulated for the back-up train through the vertical loads, which act on the lining elements in the bottom region of the tunnel over an assumed angle of 90° in the cross-section and over a tunnel length of 72 m behind the shield tail (Kasper and Meschke, 2004).…”

Section: Three-dimensional Numerical Modelmentioning

confidence: 99%

Three-dimensional numerical simulation of mechanized twin stacked tunnels in soft ground

Anh

Dias

Oreste

2014

J. Zhejiang Univ. Sci. A

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Abstract:The increase in transportation in large cities has made it necessary to construct twin tunnels at shallow depths. As far as the parallel excavation of mechanized twin tunnels is concerned, most of the cases reported in previous studies have focused on the interactions between two horizontally driven tunnels. However, less work has been devoted to the interactions between tunnels stacked over each other. The numerical investigation performed in this study has made it possible to evaluate the influence of the construction process on two stacked tunnels, using the FLAC 3D finite difference element software. The structural forces induced in each of the stacked tunnels and the displacements in the surrounding ground have been highlighted. The results of the numerical analysis indicate that new tunnel construction can have a great impact on an existing tunnel. The greatest impacts are observed when the upper tunnel is excavated first. The excavation of the upper tunnel generally leads to greater surface settlements than when the lower tunnel is excavated first. This study also shows that the normal forces induced in the lower tunnel are always greater than those developed in the upper tunnel. The normal displacements and the bending moments induced in the lower tunnel are usually smaller than those in the upper tunnel.

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“…In mean time, non-uniform ground pressures and joint interaction induced tunnel lining movement (i.e., bending moment). Lots of researchers agreed that joints in a tunnel lining evidently affect the tunnel behaviour [1][2][3][4][5][6][7]. Therefore, segmental joint needs to be less stiff and shall possess more deformation than the main portion [4].…”

Section: Introductionmentioning

confidence: 99%

3D Numerical Model of Soil-Tunnel Interaction Induced by Segment Joint Parameter

Jusoh

Mohamad

Marto

et al. 2018

J. Phys.: Conf. Ser.

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Abstract. In a shallow tunnel, tunnel construction will triggers a chain of ground movements, resulting in settlements at the ground surface, which become more significant with the decrease in tunnel depth. Therefore, by considering behaviour of the segment tunnel joints (can affect the integrity of tunnel in both circumference and longitudinal directions), the surface settlement trough were investigated. Initial model of dual segmental tunnel lining was model and validated with laboratory test to gain nonlinear response of segment joint. Then, a soil-tunnel simulation model was developed with various segment joint parametric models for Singapore Circle Line Stage 3 (C852) project. Results showed that with the use of flexible segment joints that allow movement (hinge-nonlinear model) in staggered ring tunnel model, the ground deformation depicted higher resemblance of surface settlement pattern to the field data. Steady state settlement was observed after 10m of cutter head distance.

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2D numerical investigation of segmental tunnel lining behavior

Cited by 176 publications

References 16 publications

Influence of Segmental Joints in the Segmental Circular Tunnel Lining under the Impact of Earthquakes

Influence of Segmental Joints in the Segmental Circular Tunnel Lining under the Impact of Earthquakes

Three-dimensional numerical simulation of mechanized twin stacked tunnels in soft ground

3D Numerical Model of Soil-Tunnel Interaction Induced by Segment Joint Parameter

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