Numerical Investigation of Seismic Isolation Layer Performance for Tunnel Lining in Shanghai Soft Ground

Anato, Neurly Josita; Assogba, Ogoubi Cyriaque; Tang, Aiping; Diakité, Youssouf

doi:10.1007/s13369-021-05683-8

Cited by 15 publications

(5 citation statements)

References 64 publications

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“…Foam concrete or foam Aluminium are used in impact and shocking engineering so as to protect the structure [34][35][36][37]. They can be considered as a porous material that is able to absorb impaction and shocking by deformation.…”

Section: Case Of Earthquake Damage Time Locations Resultsmentioning

confidence: 99%

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Preliminary Mechanical Evaluation of Grouting Concrete as a Protective Layer for Tunnelling

Wan

Huang³

et al. 2023

Materials

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The aim of this study is to introduce a protective layer to safeguard tunnel structures. In practice, one viable approach to create this protective layer between the tunnel structure and surrounding rocks is to pump the material during tunnel construction. The primary components of the proposed material are porous sand, rubber, and cement. Static and dynamic experiments were conducted to assess the unconfined compressive strength (UCS), flexural stiffness, and compaction resistance at various mixing ratios. The results indicate that the addition of porous sand decreases the UCS compared to the solid sand under similar mixing conditions. The addition of rubber offers the elasticity, thereby enhancing the compaction resistance. However, increasing the rubber content compromises UCS. Furthermore, this study presents a linear equation to predict the 7-day UCS, which can be used as a rapid estimation for UCS, flexural stiffness, and compaction resistance of the proposed material. It is important to note that this study only investigates the fundamental mechanical properties of the proposed material, and further comprehensive research is necessary to fully understand its workability, durability, and other behaviour before practical application.

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Section: Case Of Earthquake Damage Time Locations Resultsmentioning

confidence: 99%

“…The idea of the grouting concrete proposed in this study was learnt from foam concrete or foam aluminium [34][35][36][37]45]. They are considered as porous materials and usually applied in the impact engineering to protect the structure [46][47][48][49].…”

Section: Effect Of Porous Sandmentioning

confidence: 99%

Preliminary Mechanical Evaluation of Grouting Concrete as a Protective Layer for Tunnelling

Wan

Huang³

et al. 2023

Materials

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“…(2) 𝑛 using Equation (24). c. Obtain the seismic response of the tunnel using Equations ( 13), (17), and (18).…”

Section: 𝑛 (𝑘 S 𝑟)mentioning

confidence: 99%

“…The use of an isolation coating layer as a potential measure for reducing the seismic response of tunnels has been investigated by several studies, where a softer layer is placed between the ground and the liner. [23][24][25] The isolation coating layer can be made of various materials, such as asphalt, rubber, or foamed concrete. For the asphalt layer, the effect of seismic isolation is studied by Takeuchi et al 26 using the finite element method.…”

Section: Introductionmentioning

confidence: 99%

Analytical solution for seismic response of deep tunnels covered by an isolation layer subjected to SH waves

Yu,

Chen

2023

Num Anal Meth Geomechanics

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The paper presented a novel analytical solution to evaluate the seismic‐induced stresses and displacements of tunnels covered by an isolation coating layer subjected to SH waves. The solution is derived based on the assumptions that the ground, isolation coating layer, and liner are linear elastic and in steady‐state motion. The analytical solution is obtained using the Bessel‐Fourier series. Comparisons are made between the seismic responses of tunnels obtained using the proposed analytical solution and those of the simulation results from the FEM software ABAQUS. Additionally, the proposed solution is also compared with the known degraded solution from the literature to validate its accuracy. The influence of various key factors, such as the Young's modulus ratio between the coating layer and the ground, the thickness of the coating layer, and the relative stiffness between the ground and the liner, on the seismic response of tunnels are investigated using the proposed analytical solution.

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“…For the presented study, the boundary conditions are set to avert the negative impact of artificial boundaries on the numerical analysis results. Specifically, the adopted boundary conditions follow the scheme used by many other researchers in relevant studies (Tsinidis et al, 2014(Tsinidis et al, , 2016Andreotti and Lai, 2019;Anato et al, 2021;Zhang et al, 2021), and are validated with centrifuge tests results (Tsinidis et al, 2014(Tsinidis et al, , 2015(Tsinidis et al, and 2016. As for the lateral boundaries, horizontal kinematic tie constraints, are set for the nodes on the two vertical sides of the model, so as to allow them to have the same horizontal deformation (Tsinidis et al, 2014).…”

Section: Soil-tunnel Numerical Modelmentioning

confidence: 99%

Time-Dependent Fragility Functions for Circular Tunnels in Soft Soils

Huang

Argyroudis

Zhang

et al. 2022

ASCE-ASME J. Risk Uncertainty Eng. Syst., Part A: Civ. Eng.

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Fragility functions are used in the vulnerability analysis of structures considering different sources of uncertainties. In this research, a framework to develop time-dependent fragility functions for circular tunnels embedded in soft soils is proposed, considering the impact of corrosion on the lining reinforcement. Typical shallow and deep circular tunnel sections in soft soils of Shanghai city are used as case studies. The seismic response of the tunnel lining was obtained based on a series of nonlinear dynamic analyses of the soil-tunnel system. The aging effect due to corrosion of the reinforcement bar is considered by decreasing the strength properties of the tunnel lining. Time-dependent fragility curves as a function of free-field peak ground velocity (PGV), as well as fragility surfaces in terms of PGV and service time t, are

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Numerical Investigation of Seismic Isolation Layer Performance for Tunnel Lining in Shanghai Soft Ground

Cited by 15 publications

References 64 publications

Preliminary Mechanical Evaluation of Grouting Concrete as a Protective Layer for Tunnelling

Preliminary Mechanical Evaluation of Grouting Concrete as a Protective Layer for Tunnelling

Analytical solution for seismic response of deep tunnels covered by an isolation layer subjected to SH waves

Time-Dependent Fragility Functions for Circular Tunnels in Soft Soils

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