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Seismic Stability of 3D Tunnel Face considering Tensile Strength Cut-Off

  • Tunnel Engineering
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KSCE Journal of Civil Engineering Aims and scope

Abstract

Earthquakes can have a very adverse effect on tunnel excavation. The Mohr-Coulomb failure criterion is modified by introducing tensile strength cut-off, which allows nonlinear strength reduction of soil under tensile conditions, and kinematic analysis of tunnel face subjected to the earthquake is carried out. The pseudo-dynamic method is adopted to simulate the earthquake with the acceleration varying with time and space, improving the accuracy of the simulation. The external power and internal energy dissipation rate are equal to obtain the expression of tunnel face support pressure under the limit analysis framework. And the most unfavorable tunnel face support pressure is optimized by using the method of exhaustion. Compared with other research results, the validity of this method is proved. The influence of soil parameters and pseudo-dynamic parameters on the critical support pressure is revealed by further parameter analysis. Finally, this study provides an effective reference for seismic design of tunnel engineering construction.

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Abbreviations

a h :

Horizontal seismic accelerations

a v :

Vertical seismic accelerations

c :

Cohesion

d :

Tunnel diameter

f :

Factor of amplitude enhancement

G :

Shear modulus

g :

Acceleration of gravity

k h :

Horizontal seismic acceleration coefficient

k v :

Vertical seismic acceleration coefficient

R :

Radius of the cross section circle

r A :

Length of radial line OA

r B :

Length of radial line OB

r E :

Length of radial line OE

r F :

Length of radial line OF

r G :

Length of radial line OG

r m :

The distance between the origin O and the center of the cross section circle

T s :

Seismic vibration period

u v :

Ratio of vertical to horizontal seismic coefficients

V s :

Shear wave velocity

V p :

Primary wave velocity

γ :

Unit weight of soil

δ :

Dilatancy angle

δ n :

Maximum dilatancy angle

θ A :

Angle between vertical direction and radial line OA

θ B :

Angle between vertical direction and radial line OB

θ F :

Angle between vertical direction and radial line OF

θ G :

Angle between vertical direction and radial line OG

θ O :

Angle between vertical direction and radial line OE

λ s :

Wavelengths of shear wave

λ p :

Wavelengths of primary wave

μ :

Poisson’s ratio of soil

ξ :

The coefficient of tension cut-off

ρ :

Density of soil

ϕ :

Friction angle

ω :

Angular velocity

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Acknowledgments

This manuscript was supported by the Fundamental Research Funds entitled “Pseudo-dynamic Stability of Tunnel Face Based on 3D Discretization Technique” for the Central Universities of Central South University.

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Correspondence to Jing Liu.

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Liu, J., Luo, WJ. & Liu, LL. Seismic Stability of 3D Tunnel Face considering Tensile Strength Cut-Off. KSCE J Civ Eng 26, 3620–3632 (2022). https://doi.org/10.1007/s12205-022-1967-3

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  • DOI: https://doi.org/10.1007/s12205-022-1967-3

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