Visco-elastic imperfect bonding effect on dynamic response of a non-circular lined tunnel subjected to P and SV waves

Fang, Xue-Qian; Jin, Hexin

doi:10.1016/j.soildyn.2016.05.014

Cited by 22 publications

(10 citation statements)

References 12 publications

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“…The second one is an elastic slip interface. They are proposed by Fang and Jin (2016) [3] and Fang et al (2018) [4]. In this proposal, we use another model developed by Achenbach and Zhu (1989) [2].…”

Section: Boundary and Interface Conditionsmentioning

confidence: 99%

“…A bibliographical survey has been carried out with a special attention to extract articles focusing on configurations close to the LSBB-kind geometry (cylindrical galleries with a concrete layer). Fang and Jin (2016) [3] study the dynamic response of a non-circular tunnel subjected to P and SV waves. They use a visco-elastic interface to model the contact between the rock mass and the tunnel.…”

Section: Introductionmentioning

confidence: 99%

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Contribution to the modeling and the mechanical characterization of the subsoil in the LSBB environment

2019

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The present research work aims at better characterizing the specific underground environment of the LSBB (Low Noise Inter-Disciplinary Underground Science and Technology, Rustrel, France) using mechanical wave propagation information. The LSBB experimental environment is characterized by a system of cylindrical galleries, some of them presenting a concrete layer. In the global project, three steps are considered : firstly the construction of an efficient forward mechanical wave propagation model to calculate the displacement vector and stress tensor components; secondly a sensitivity analysis to extract the pertinent parameters in the configurations and models under study (viscoelastic or poroviscoelastic media with potential anisotropy); and lastly an inversion strategy to recover some of the pertinent parameters. In this proposal, the first step, under progress, is described. The work carried out is in the continuity of the work presented by Yi et al. (2016) [1] who studied the harmonic response of a cylindrical elastic tunnel, impacted by a plane compressional wave, embedded in an infinite elastic ground. The interface between the rock mass and the linen is an imperfect contact modeled with two spring parameters, Achenbach and Zhu (1989) [2]. We choose a semi-analytical approach to calculate the two-dimensional displacement and stress fields in order to get a fast tool, from the numerical point of view. The main steps of the theoretical approach are : use of the Helmholtz decomposition, solving the wave equation based on the separation method and the expansion in Bessel function series in the harmonic domain. The harmonic results are validated by comparison with Yi et al. (2016) [1] and new ones are presented. Moreover, the transient regime case obtained with the use of a Fourier transform on the time variable, is under progress.

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Section: Boundary and Interface Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Contribution to the modeling and the mechanical characterization of the subsoil in the LSBB environment

2019

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“…The wave function expansion method was used and the imperfect interface was modeled with a spring model in the paper [1,2]. Using the wave function expansion method and conformal transformation method, Fang et al [3][4][5][6] derived the dynamic stress around a non-circular tunnel with imperfect interface subjected to anti-plane shear waves, P waves and SV waves. The stiffness parameter and viscosity coefficient are used to take into account the visco-elastic characteristic of the interface.…”

Section: Introductionmentioning

confidence: 99%

Surface Effects on a Coated Fiber with an Imperfect Interface Subjected to Plane Compressional Wave

Lei¹,

Wang²,

Ou³

2019

IJAMTP

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With the rapid development of nanotechnology, nano-components and nano-materials will be widely concerned and applied. At the nano-scale, due to the obvious increase the ratio of surface area to the volume effect and surface effect of nano-components and nano-materials are significant, making their mechanical properties significantly different from the material properties under the macroscopic conditions. And in the practical cases, the interface is not always perfect and smooth, they always have a certain form of defects. Therefore, the wave function expansion method is used in the analytical solutions of dynamic stress concentration factor (DSCF) around a coated fiber with an imperfect interface at nano-scale. The stress boundary conditions on the interface are obtained by using the generalized Young-Laplace equation and the imperfect displacement boundary conditions on the interface are modeled by a spring model. Considering the effects of surface and spring model, the influence of spring stiffness, the number of incident wave and the surface effects on the DSCF are analyzed. The results show that the frequency of incident wave, the spring stiffness and the surface energy have significant effects on the dynamic stress concentration distributions of the nano-sized coated fiber. The smaller the spring coefficient is, the stronger the interface imperfection is, and the stronger the stress concentration at the boundary is. When the spring coefficient reaches a certain value, it is almost close to the dynamic stress value under the ideal interface. The DSCF are obviously different under different incident wave frequencies.

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“…A bibliographical survey has been carried out with a special attention to select articles focusing on configurations close to the LSBB-kind geometry. Fang et al [1] studied the dynamic response of a non-circular tunnel subjected to longitudinal and transversal waves (P, SV). They used a visco-elastic interface to model the contact between the rock mass and the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Transient Response of a Tunnel Embedded in a Heterogeneous Elastic Full Space

Bouaré¹,

Mesgouez²,

Lefeuve-Mesgouez³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Visco-elastic imperfect bonding effect on dynamic response of a non-circular lined tunnel subjected to P and SV waves

Cited by 22 publications

References 12 publications

Contribution to the modeling and the mechanical characterization of the subsoil in the LSBB environment

Contribution to the modeling and the mechanical characterization of the subsoil in the LSBB environment

Surface Effects on a Coated Fiber with an Imperfect Interface Subjected to Plane Compressional Wave

Transient Response of a Tunnel Embedded in a Heterogeneous Elastic Full Space

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