Seismic Effects of Two-Dimensional Subsurface Cavity on the Ground Motion by BEM: Amplification Patterns and Engineering Applications

Alielahi, Hamid; Adampira, Mohammad

doi:10.1007/s40999-016-0020-7

Cited by 14 publications

(5 citation statements)

References 38 publications

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“…They confirmed that cavities significantly influenced ground motion at high frequencies. In this context, many researchers have explored the cavity or tunnel effect on seismic ground response under body waves through various methods, such as analytical methods [8][9][10], numerical simulations [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], and model tests [27][28][29][30]. Due to the complexity involved in wave propagation and limitations in modeling complicated systems of equations, numerical techniques are more effective compared to analytical and model tests for the parametric study of ground vibration problems [31].…”

Section: Introductionmentioning

confidence: 99%

A numerical study on effect of underground cavities on seismic ground response due to Rayleigh wave propagation

2023

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Recent studies found that some structural damage can be attributed to the effect of surface waves. A shallow underground structure may be heavily influenced by surface waves, which makes to lose energy over distance more slowly than body waves. This study deals with evaluating the effect of Rayleigh waves (R-waves) interaction with underground cavities on the seismic ground response and amplification pattern using the Finite Element Method (FEM). First, the FEM model was verified to ensure its accuracy. Then, the influences of the effective parameters, such as cavity burial depth, distance from the cavity axis, and dimensionless incident frequency were investigated. Parametric studies revealed that the amplitude of ground motion is greater in the presence of a cavity with respect to that in the free-field condition. It was indicated that shallow cavities cause more amplification than cases with a larger depth ratio. By moving away from the wave source, the response of receiver points has a declining trend. Due to the complex interaction of R-waves with a cavity, the right side of the cavity has less amplitude than the left side. Finally, by increasing the dimensionless incident frequency, the distribution of the surface displacements and wave diffraction patterns gradually becomes more complicated while the peak displacement components decrease. Consequently, in light of the importance of the R-wave interaction with subsurface spaces, the findings of this study can help improve seismic design procedures and seismic microzonation guidelines.

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Section: Introductionmentioning

confidence: 99%

A numerical study on effect of underground cavities on seismic ground response due to Rayleigh wave propagation

2023

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“…They showed that a significant amplification and a horizontal peak ground acceleration appears at the edge of the larger subway station and in the vicinity of the Daikai station, respectively. Other researchers [11], [12], [13], [14], [15] used the boundary element method to study the ground surface displacement and dynamic behaviour of the underground structures. They concluded that the presence of underground cavities had a noteworthy effect on the amplification generated on the ground surface.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the influence of near-fault and far-fault earthquakes on a subway station with emphasis to scattering on the wave propagation

Isari,

Hadidi,

Razavi

et al. 2023

Numerical Methods in Civil Engineering

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To improve the design of surface structures built on underground structures for safety and earthquake resistance, it is necessary to study the effects of the underground structures on wave propagation scattering and surface ground acceleration. To this end, various parameters must be studied, including input motion, structure embedment, and dimensions of different subway stations. The present study focuses on these parameters by employing a nonlinear cyclic model called ARCS soil's shear modulus reduction and damping ratio increase corresponding to those given by the user. The variations in spectral ratio, affected period range, peak ground acceleration, and peak relative lateral displacement versus relative distance under near-fault and far-fault earthquakes are presented. The results indicate that different amplification or deamplification effects at different surface positions were produced at each frequency by appearing a significant influence on the dynamic behavior of ground surface, soil layers, and the surface structure when a subway station is present. A 1.3 times increase in the surface ground acceleration when subjected to far-fault earthquakes and a 1.6 times increase in the relative displacement indicated that study parameters have significant influence on the amplification ratio and scattering of wave. D

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“…In general, the calculation methods include the analytical method [6][7][8][9], finite element method [10][11][12], finite difference method [13][14][15], boundary element method [16][17][18][19], boundary integral equation method [20][21][22][23], etc. It is worth mentioning that all of these studies assumed that the lining and surrounding rock are completely bonded.…”

Section: Introductionmentioning

confidence: 99%

IBIEM Analysis of Dynamic Response of a Shallowly Buried Lined Tunnel Based on Viscous‐Slip Interface Model

Zhou

Liang

Liu

et al. 2019

Advances in Civil Engineering

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A viscous-slip interface model is proposed to simulate the contact state between a tunnel lining structure and the surrounding rock. The boundary integral equation method is adopted to solve the scattering of the plane SV wave by a tunnel lining in an elastic half-space. We place special emphasis on the dynamic stress concentration of the lining and the amplification effect on the surface displacement near the tunnel. Scattered waves in the lining and half-space are constructed using the fictitious wave sources close to the lining surfaces based on Green’s functions of cylindrical expansion and the shear wave source. The magnitudes of the fictitious wave sources are determined by viscous-slip boundary conditions, and then the total response is obtained by superposition of the free and scattered fields. The slip stiffness and viscosity coefficients at the lining-surrounding rock interface have a significant influence on the dynamic stress distribution and the nearby surface displacement response in the tunnel lining. Their influence is controlled by the incident wave frequency and angle. The hoop stress increases gradually in the inner wall of the lining as sliding stiffness increases under a low-frequency incident wave. In the high-frequency resonance frequency band, where incident wave frequency is consistent with the natural frequency of the soil column above the tunnel, the dynamic stress concentration effect is more significant when it is smaller. The dynamic stress concentration factor inside the lining decreases gradually as the viscosity coefficient increases. The spatial distribution and the displacement amplitudes of surface displacement near the tunnel change as incident wave frequency and angle increase. The effective dynamic analysis of the underground structure under an actual strong dynamic load should consider the slip effect at the lining-surrounding rock interface.

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Seismic Effects of Two-Dimensional Subsurface Cavity on the Ground Motion by BEM: Amplification Patterns and Engineering Applications

Cited by 14 publications

References 38 publications

A numerical study on effect of underground cavities on seismic ground response due to Rayleigh wave propagation

A numerical study on effect of underground cavities on seismic ground response due to Rayleigh wave propagation

Numerical study on the influence of near-fault and far-fault earthquakes on a subway station with emphasis to scattering on the wave propagation

IBIEM Analysis of Dynamic Response of a Shallowly Buried Lined Tunnel Based on Viscous‐Slip Interface Model

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