Surface Motion of Alluvial Valleys Subjected to Obliquely Incident Plane<i>SH</i>-Wave Propagation

Panji, Mehdi; Mojtabazadeh-Hasanlouei, Saeed

doi:10.1080/13632469.2021.1927886

Cited by 17 publications

(5 citation statements)

References 77 publications

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“…The boundary technique mostly known as the Boundary Element Method (BEM) are formulated in two types of the full-space and half-space (Dominguez & Meise, 1991) In this field, the isotropic investigations are presented by Ohtsu & Uesugi (1985), Ding & Dravinski (1996), Mogi & Kawakami (2007), Kamalian et al (2008), Ba et al (2017). In the studies of Panji et al (2020), Panji & Mojtabazadeh (2018& 2021& 2022b they studied the seismic behavior of various topographic features by a simple process half-space time-domain BEM.…”

Section: Literature Surveymentioning

confidence: 99%

A Simple Time-Domain BEM Model for Heterogeneous Orthotropic Hill-Shaped Topographies Under Attenuated Incident SH-Wave

Mojtabazadeh-Hasanlouei

Panji

Kamalian

2023

Preprint

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A simple numeric model named DASBEM was successfully developed to analyze the seismic heterogeneous orthotropic hill-shaped topographies by a time-domain boundary element method based on half-space Green’s functions. The model was elaborated only by discretizing the hill surface and its interface with the underlying half-space in the use of image source theory and substructure approach. To improve the model at the corners, the double node procedure was applied to extreme nodes of the used quadratic elements. An attenuation ratio is implemented in the boundary equations using a decremental exponential function. After presenting the technique, a validation example presented beside the literature to measure the convergence with an isotropic response. Then, a sample Gaussian–shaped hill model is prepared under propagating obliquely incident SH-waves as common sample topography and the surface response is obtained by considering some significant parameters as well as the shape ratio, isotropy factor, frequency content, and angle of the incident wave. The ground surface response is sensitized in two time and frequency realms. The results showed that the amplitude of the response was not only dependent on the impedance ratio but also the isotropy ratio was always effective in orienting the wavefront to amplify the ground movement.

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Section: Literature Surveymentioning

confidence: 99%

A Simple Time-Domain BEM Model for Heterogeneous Orthotropic Hill-Shaped Topographies Under Attenuated Incident SH-Wave

Mojtabazadeh-Hasanlouei

Panji

Kamalian

2023

Preprint

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“…The application examples connect to recent seismic hazard research concerning amplification of incident plane SH (shear horizontal) waves, and related dynamic stress concentration, caused by 2D medium anomalies close to the surface. Single and multiple inclusions of various types have been considered [17][18][19], as well as topography irregularities [20] and alluvial valleys [21][22][23]. Numerical methods like the boundary-element method (BEM), which is used in several of the mentioned papers, are very flexible concerning variations of anomaly shape and type.…”

Section: Introductionmentioning

confidence: 99%

Coupled-mode separation of multiply scattered wavefield components in two-dimensional waveguides

Ivansson

2023

R. Soc. open sci.

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For a waveguide that is invariant in one of the horizontal directions, this paper presents a mathematically exact partial-wave decomposition of the wavefield for assessment of multiple scattering by horizontally displaced medium anomalies. The decomposition is based on discrete coupled-mode theory and combination of reflection/transmission matrices. In particular, there is no high-frequency ray approximation. Full details are presented for the scalar case with plane-wave incidence from below. An application of interest concerns ground motion induced by seismic waves, which may be severely amplified by local medium anomalies such as alluvial valleys. Global optimization techniques are used to design an artificial medium termination at depth for a normal-mode representation of the field. A derivation of a horizontal source array to produce an incident plane wave gives, as a by-product, an extension of a previous Fourier-transform relation involving Bessel functions. Like purely numerical methods, such as finite differences and finite elements, the method can handle all kinds of (two-dimensional) anomaly shapes.

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“…In addition, research has also been conducted on surface terrain dynamics using the Boundary Element Method (BEM). For example, Panji [18] utilized the BEM approach to analyze the surface motion of arbitrarily shaped impact craters subjected to incident planar shock waves. Panji [19] also employed the BEM method to perform a dynamic analysis of inclined SH-waves propagating over a semi-sine-shaped alluvial hill above a subsurface circular cavity.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Analysis of Wedge-Shaped Rock Slopes under Harmonic Wave Action

Du,

Xu,

Han

et al. 2023

Buildings

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In dynamic disasters involving rock slopes, wedge failures formed by complex structural discontinuities are more predominant, and the dynamic response associated with them remains a classic concern in rock slope engineering. To address this concern, this paper utilized refined modeling to analyze a wedge-shaped rock slope by inputting horizontal harmonics as loads. We conducted dynamic response analyses by varying the inclination of the structural surface on the wedge-shaped rock slope, the axial offset angle, the friction coefficient, and the configuration of the single sliding surface. The results in this paper indicate that for wedge-shaped and single-sliding-surface configurations of rock slopes, with an increase in the structural surface inclination angle, the dynamic response of the sliding body, stress distribution, excellent frequency, and spectrum values all increase. Furthermore, wedge-shaped rock slopes’ dynamic responses are more significant than those of single-sliding-surface rock slopes. For wedge-shaped rock slopes, increases in the axial offset angle and structural surface friction coefficient reduce the dynamic response, excellent frequency, and spectrum values. Meanwhile, within the context of the axial offset angle conditions in wedge-shaped rock slopes, the dynamic response, excellent frequency, and spectrum values are better than the variations in the structural surface friction coefficient. Under the influence of these factors, stress concentration occurs at the sliding fronts of rock slopes.

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Surface Motion of Alluvial Valleys Subjected to Obliquely Incident PlaneSH-Wave Propagation

Cited by 17 publications

References 77 publications

A Simple Time-Domain BEM Model for Heterogeneous Orthotropic Hill-Shaped Topographies Under Attenuated Incident SH-Wave

A Simple Time-Domain BEM Model for Heterogeneous Orthotropic Hill-Shaped Topographies Under Attenuated Incident SH-Wave

Coupled-mode separation of multiply scattered wavefield components in two-dimensional waveguides

Dynamic Response Analysis of Wedge-Shaped Rock Slopes under Harmonic Wave Action

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