Numerical investigation of multi-directional site response based on KiK-net downhole array monitoring data

Han, Bo; Zdravković, Lidija; Kontoe, Stavroula; Taborda, David M.G.

doi:10.1016/j.compgeo.2017.04.008

Cited by 17 publications

(3 citation statements)

References 27 publications

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“…It is noted that this paper only investigates the one-dimensional site response due to the vertical ground motion without considering any potential interaction with the horizontal component. In multi-directional analyses, the interaction of the three components of the ground motion can be important, particularly when significant nonlinearity in the soil behaviour is expected (Han et al 2016b and2017). Zienkiewicz et al (1980) theory Table 3: Soil parameters for the coupled 1-D soil column analysis Table 4: Permeability values for parametric studies (coupled FE analysis)…”

Section: Quantitative Study Of the Variation Of Hm Viscous Dampingmentioning

confidence: 99%

Analytical and numerical investigation of site response due to vertical ground motion

2018

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Due to the repeatedly observed strong vertical ground motions and compressional damage of engineering structures in recent earthquakes, the multidirectional site response analysis is increasingly critical for the seismic design of important structures, such as nuclear power plants and high earth dams. However, the site response to the vertical component of the ground motion has not been the subject of detailed investigation in the literature. Therefore, in this paper, the vertical site response due to vertical ground motion is investigated by employing both analytical and numerical methods. Firstly, a 1-D frequency domain analytical solution, which can be employed for vertical site response analysis in practice, is studied and compared against time domain Finite Element (FE) analyses for the two extreme soil state conditions (i.e. undrained and drained conditions). The vertical site response is further investigated with hydro-mechanically (HM) coupled FE analysis, considering solid-fluid interaction. The undertaken parametric studies show that the predicted vertical site response is strongly affected by the parameters characterising the hydraulic phase, i.e. soil permeability and soil state conditions, both in terms of frequency content and amplification. The subsequent corresponding quantitative investigation, of the frequency content and amplification function of the vertical site response, shows that depending on the soil permeability the response is dominated by the two types of compressional waves (fast and slow wave). Notably, the parametric studies identify a range of permeability that significantly affects dynamic soil properties in terms of P-wave velocities, damping ratios and vertical site response, and this range is relevant for geotechnical earthquake engineering applications. It is therefore recommended that coupled consolidation analysis is necessary to accurately simulate this effect at such permeability-dependent intermediate transient states between fully undrained and drained conditions. Finally, this work suggests a simple modification of standard total-stress site response analysis to account for vertical ground motion and solid-pore fluid interaction. In order to simulate the attenuation of the response due to solid-pore fluid interaction effects, it is suggested to employ additional HM viscous damping in total-stress analysis, further to the one used to account for hysteretic material damping. This additional viscous damping can be quantified based on the empirical curves proposed in the paper.

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Section: Quantitative Study Of the Variation Of Hm Viscous Dampingmentioning

confidence: 99%

Analytical and numerical investigation of site response due to vertical ground motion

2018

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“…The only exception is that a higher value was adopted for parameter s, which controls the constrained modulus degradation, than the corresponding parameter b which controls shear modulus degradation (see Table 2). This is based on the investigation of Han (2014) and Han et al (2016b), where by back-analysing downhole array seismic data it was found that the constrained modulus has a wider linear plateau but its degradation appears to be slightly steeper afterward, than that of the shear modulus.…”

Section: Materials Propertiesmentioning

confidence: 99%

Numerical investigation of the response of the Yele rockfill dam during the 2008 Wenchuan earthquake

Han

Zdravković

Kontoe

et al. 2016

Soil Dynamics and Earthquake Engineering

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“…This model has been successfully used in static and dynamic-seismic analyses of soil-structure interaction problems [Kontoe et al, 2012;Kontoe et al, 2014;Han, 2014;Han et al, 2016;Han et al, 2017]. Due to the lack of experimental data, the CNL model is calibrated on empirical relations.…”

Section: Numerical Model and Calibrationmentioning

confidence: 99%

The Effects of Dam–Reservoir Interaction on the Nonlinear Seismic Response of Earth Dams

Pelecanos

Kontoe

Zdravković

2018

Journal of Earthquake Engineering

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The objective of this study is to investigate the effects of damreservoir interaction (DRI) on the nonlinear seismic response of earth dams. Although DRI effects have for long been considered as insignificant for earth dams, that conclusion was mainly based on linear elastic investigations which focused only on the acceleration response of the crest without examining the seismic shear stresses and strains within the dam body. The present study explores further the impact of DRI focusing on the nonlinear behavior of earth dams. The effects of reservoir hydrodynamic pressures are investigated in terms of both seismic dam accelerations and nonlinear dynamic soil behavior (seismic shear stresses and strains). It is shown that although dam crest accelerations are indeed insensitive to DRI, the stress and strain development within the dam body can be significantly underestimated if DRI is ignored. ARTICLE HISTORY

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Numerical investigation of multi-directional site response based on KiK-net downhole array monitoring data

Cited by 17 publications

References 27 publications

Analytical and numerical investigation of site response due to vertical ground motion

Analytical and numerical investigation of site response due to vertical ground motion

Numerical investigation of the response of the Yele rockfill dam during the 2008 Wenchuan earthquake

The Effects of Dam–Reservoir Interaction on the Nonlinear Seismic Response of Earth Dams

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