Seismic ground amplification by unlined tunnels subjected to vertically propagating SV and P waves using BEM

Alielahi, Hamid; Kamalian, Mohsen; Adampira, Mohammad

doi:10.1016/j.soildyn.2015.01.007

Cited by 80 publications

(19 citation statements)

References 52 publications

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“…In order to evaluate the seismic response of underground cavities and the impact of them on the ground surface, an effective software system known as SAMBE (Seismic Analysis of Multiple Boundary Element) was developed by Alielahi [3] and Alielahi et al [4,5] based on time-domain boundary element method. Using this code, deformations due to scattering of seismic waves affected by surface and subsurface features are measured.…”

Section: Numerical Formulationmentioning

confidence: 99%

“…In the case of SV waves, f(t) designates the horizontal component of the incident motion, while the vertical component is zero, and in case of P waves, it is vice versa. The maximum amplitude of Ricker wave is assumed 1.0 mm, and also, the cavity has a radius of 50 m. The shear wave velocity, Poisson ratio and mass density are 223 m/s, 0.33 and 2.0 ton/m3, respectively [4,5].…”

Section: Validation Of the Proposed Algorithmmentioning

confidence: 99%

“…Later, Parvanova et al [49] examined the seismic reaction of unlined and lined tunnels, as well as multiple buried inclusions within the elastic homogeneous halfplane in the frequency domain. Recently, Alielahi [3] and Alielahi et al [4,5] provided an advanced formulation of time-domain 2D boundary element method (BEM) and developed an efficient algorithm to analyze the seismic reaction of underground structures and the ground surface response.…”

Section: Introductionmentioning

confidence: 99%

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A BEM investigation on the influence of underground cavities on the seismic response of canyons

2015

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Two-dimensional site effects caused by cavities under topographical functions can considerably impact the seismic reaction of the ground surface. Due to the complexity of scattering issues by topographical features above subterranean cavity, few studies have been done in this field. In the present study, the seismic response of semisine-shaped canyons above a subterranean cavity (hole) of different dimensions, depths and locations is examined. The medium is assumed to have a linear elastic constitutive behavior exposed to vertically propagating incident SV and P waves. All calculations are performed using the direct boundary element technique in the time domain. It is observed that a cavity below a canyon can considerably change the ground response of the surface in different periodic bands. The seismic interaction between canyon and cavity with respect to various geometrical parameters will lead to different amplification patterns in the center and edge of the canyon. One of the most important results is the increase in amplification of long periods compared with the case of a canyon without cavity. Moreover, parametric research shows the fact that the cavity detail and canyon height, the ratio of cavity to the canyon size and cavity location impact on the seismic amplification of the canyon surface. Finally, spectral amplification coefficients of the canyon surface led by the cavity are reported for different cases of the canyon-cavity interaction.

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Section: Numerical Formulationmentioning

confidence: 99%

Section: Validation Of the Proposed Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A BEM investigation on the influence of underground cavities on the seismic response of canyons

2015

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“…Pitilakis et al (2014) presented a series of numerical analysis to investigate the dynamic response of shallow circular tunnels. Alielahi et al (2015) utilized the BEM to study the seismic ground amplification by unlined tunnels subject to vertically P and SV wave propagation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic interaction of twin vertically overlapping lined tunnels in an elastic half space subjected to incident plane waves

2016

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The scattering of plane harmonic P and SV waves by a pair of vertically overlapping lined tunnels buried in an elastic half space is solved using a semi-analytic indirect boundary integration equation method. Then the effect of the distance between the two tunnels, the stiffness and density of the lining material, and the incident frequency on the seismic response of the tunnels is investigated. Numerical results demonstrate that the dynamic interaction between the twin tunnels cannot be ignored and the lower tunnel has a significant shielding effect on the upper tunnel for high-frequency incident waves, resulting in great decrease of the dynamic hoop stress in the upper tunnel; for the low-frequency incident waves, in contrast, the lower tunnel can lead to amplification effect on the upper tunnel. It also reveals that the frequency-spectrum characteristics of dynamic stress of the lower tunnel are significantly different from those of the upper tunnel. In addition, for incident P waves in low-frequency region, the soft lining tunnels have significant amplification effect on the surface displacement amplitude, which is slightly larger than that of the corresponding single tunnel.

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“…Rostami et al (2016) [11] evaluated seismic behavior and earth's surface acceleration, by interaction of tunnels with different shapes and different types of soils. Also Alielahi et al [12] (2015) worked on seismic ground amplification by unlined tunnels and concluded that the effect of the tunnel on the seismic ground surface response is gradually decreased or becomes insignificant with increasing the buried depth of the tunnel. Several researchers (e.g.…”

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confidence: 99%

Impact of Soil Type Used in Tunneling on Land Subsidence and Mobility Effective Time under Different Earthquake Records

Rostami¹,

Firoozfar²,

Adhami³

et al. 2016

OJG

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During recent decades, tunnels construction in urban environments has been recognized as a useful factor in improving transportation situation in cities. Construction of underground structures like tunnels has a direct impact on the above-ground structures. The most important impacts are soil crust movement of the structure movement), acceleration change of the earthquake on structures, and land subsidence. The present research aims at seismic evaluation of the effect of soil type in land subsidence and effective mobility time in tunneling projects. For this purpose, two different soil types are chosen to model and assess factors using numerical methods. The outcome of this research concludes that tunneling changes in the dominant frequency record if these changes reach to the extent that structure frequency equals to record frequency, resonance phenomenon happens.

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Seismic ground amplification by unlined tunnels subjected to vertically propagating SV and P waves using BEM

Cited by 80 publications

References 52 publications

A BEM investigation on the influence of underground cavities on the seismic response of canyons

A BEM investigation on the influence of underground cavities on the seismic response of canyons

Dynamic interaction of twin vertically overlapping lined tunnels in an elastic half space subjected to incident plane waves

Impact of Soil Type Used in Tunneling on Land Subsidence and Mobility Effective Time under Different Earthquake Records

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