Influence of long-term dynamic load induced by high-speed trains on the accumulative deformation of shallow buried tunnel linings

Yi, Haiyang; Qi, Taiyue; Qian, Wangping; Lei, Bo; Pu, Binrong; Yu, Yangyang; Liu, Yixuan; Li, Zongyang

doi:10.1016/j.tust.2018.11.005

Cited by 39 publications

(13 citation statements)

References 42 publications

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“…Although Zhao [34][35][36] have successfully used the finite and infinite elements coupled method and the related wave input procedure in infinite media to solve the dynamic response, the application of this method to study the dynamic response of polymeric seismic isolation around tunnels has not been done before.…”

Section: Infinite Element Modelmentioning

confidence: 99%

Seismic Isolation Effect of Non-Water Reacted Two-Component Polymeric Material Coating on Tunnels

Wang

Guo

et al. 2020

Applied Sciences

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An isolation layer is one of the countermeasures to promote the anti-seismic performance of tunnels. A newly invented polymeric material, non-water reacted two-component polymeric material (NRTCPM), is superior in impermeability and construction efficiency. In this study, covering a tunnel with NRTCPM coating to mitigate the damage caused by an earthquake is discussed, and an Impact Resonance Test (IRT) is firstly used to obtain the damping ratios and dynamic elastic modulus of NRTCPM. By using infinite element boundary, eight dynamic numerical modelsare made to study the isolation effects based on different density, Poisson’s ratio, dynamic elastic modulus and thickness of isolation layer values. Three different conditions are explored in this paper, namely (1) no NRTCPM layer coating around tunnel; (2) different densities, Poisson’s ratios and dynamic elastic moduli of a polymeric layer; and (3) various thicknesses of polymeric isolation layers around the lining. Tensile and compressive stresses are compared under these different conditions. The results show that retrofitting tunnel lining with this material has a good effect on seismic isolation. An optimum density and thickness of the NRTCPM layer is suggested considering cost and strength.

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Section: Infinite Element Modelmentioning

confidence: 99%

Seismic Isolation Effect of Non-Water Reacted Two-Component Polymeric Material Coating on Tunnels

Wang

Guo

et al. 2020

Applied Sciences

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“…The additional internal force of shield tunnel with segment lining (joint interface) was larger than that of shield tunnel with homogeneous equivalent stiffness model, In addition, the secondary lining could significantly inhibit the development of segmental lining cracking and reduced the internal force of bolts [12][13]. Yi et al studied the cumulative deformation mechanism of tunnel lining under long-term dynamic load, and they found that the deformation of lining ring increased slightly at the beginning and significantly later due to joint dislocation and opening [14]. Seong et al studied the dynamic response of rigid lining with different curvature under the train wind load, they found that the higher the vehicle speed, the greater the dynamic response, and the smaller the dynamic response when the curvature was greater [15].…”

Section: State Of the Artmentioning

confidence: 99%

“…The finite element model was 90 m long, 60 m wide, and 40 m high. The size of the infinite element model was ten times that of the finite element model [14]. As shown in Fig.…”

Section: Building Computational Modelmentioning

confidence: 99%

Spatial Distribution Law of Vibration Acceleration of Ultra-small-spacing Tunnel under Train Moving Loads

Wang¹,

Shi²,

Li³

et al. 2019

JESTR

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The operation safety of ultra-small-spacing subway tunnels is seriously threaten by long-term, high-frequency, low amplitude train vibration loading. Although the vibration loading generated by the train is small each time, the durability of the tunnel structure may be reduced or even cracked under long-term impact. To study the spatial distribution law of vibration acceleration of ultra-small-spacing tunnels under train moving loading, a three-dimension numerical model was established for a subway-track tunnel with a design speed of 120 km/h, and the spatial distribution law of vibration acceleration of the subway track system and surrounding rocks of the tunnel with single train running, double trains running in the same direction and double trains running in the reverse direction were analyzed. Results show that the vertical acceleration of the wheel-rail contact point is always the largest in the longitudinal direction, and the vertical acceleration of waist of the middle rock pillar wall is about 60% of the bottom of the roadbed. The vertical acceleration of the surrounding rock of the tunnel satisfies the distribution law of the exponential function in both the horizontal and vertical directions. The vertical acceleration propagates along the midline to both sides in the lateral direction, the vertical acceleration attenuates about 80% at 6 m and 95% at 10 m. The vertical acceleration at the waist of the middle rock pillar wall is the largest in the vertical direction, and its attenuate sharply to both ends of the rock pillar. After 10 m, the attenuation rate gradually becomes gentle. The obtained conclusions can provide the theoretical base in the design and construction of similar engineering.

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“…Owing to the characteristics of multieffect coupling, load reciprocating superposition, and complex deformation of overlapped tunnels under dynamic loading, the degree and scope of structural damage are aggravated, which poses a great potential safety risk for the construction and operation of the overlapped tunnel [18]. At present, some scholars have studied the dynamics of the overlapped tunnel, mainly focusing on the effects of blasting vibration, train loading, and seismic loading [19,20]. e blasting excavation of overlapped tunnels has specific unique characteristics, which not only ensures that the original tunnel structure and support system will not be damaged during blasting but also considers the self-stability of surrounding rock after multiple vibrations [21].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Parallel Overlapped Tunnel under Seismic Loading by Shaking Table Tests

Yang

Rao

Wu³

et al. 2021

Shock and Vibration

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Potential earthquake-induced damage to overlapped tunnels probably occurs during the operation and maintenance of mountain tunnel engineering, especially in the seismically active zone. This study investigated the dynamic response and the failure characteristics of the parallel overlapped tunnel under seismic loadings by employing shaking table tests. The failure mode of the parallel overlapped tunnels was analyzed through macroscopic test phenomena. The dynamic responses of the surrounding rock and tunnel lining were evaluated by acceleration and dynamic strain, respectively. In particular, wavelet packets were used to investigate the spectrum characteristics of the tunnel structure in depth. The failure process of the model can be divided into three stages. The upper-span and the under-crossing tunnels showed different failure characteristics. Additionally, the lining damage on the outer surface of the tunnel mainly occurred on the right side arch waist and the left side wall, whereas the lining damage on the inner surface of the tunnel mainly appeared on the crown and invert. Wavelet packet energy results showed that the energy characteristic distributions of the upper-span and the under-crossing tunnels were not consistent. Specifically, the energy eigenvalues of the crown of the upper-span tunnel and the invert of the under-crossing tunnel were the largest, which should be considered to be the weak parts in the seismic design.

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Influence of long-term dynamic load induced by high-speed trains on the accumulative deformation of shallow buried tunnel linings

Cited by 39 publications

References 42 publications

Seismic Isolation Effect of Non-Water Reacted Two-Component Polymeric Material Coating on Tunnels

Seismic Isolation Effect of Non-Water Reacted Two-Component Polymeric Material Coating on Tunnels

Spatial Distribution Law of Vibration Acceleration of Ultra-small-spacing Tunnel under Train Moving Loads

Dynamic Response of Parallel Overlapped Tunnel under Seismic Loading by Shaking Table Tests

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