Testing performance of pore pressure models implemented in one-dimensional site response analysis program against centrifuge test data measured in mildly sloping ground

Pervaiz, Usman; Park, Duhee; Hashash, Youssef M. A.; Xing, Guangchao

doi:10.1016/j.soildyn.2021.106867

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…Different models exhibit distinct maximum Ru pro les. The GQH-PA model represents the worst-case scenario, with liquefaction occurring (Ru = 1) in layers between 5 and 22 m, whereas the GQH-VD model represents the mildest case, where substantial Ru of 0.2-0.4 is generated at depths of 15-22 m. Generally, the PA model predicts higher PWP than the VD model, which is consistent with the study made by Pervaiz et al (2021). Despite the differences among the models, the NF motion consistently produces higher Ru than the GL motion.…”

Section: Nonlinear Modelssupporting

confidence: 86%

Numerical study on the effect of near-fault pulse motion on soil liquefaction potential

Tsai,

Li,

Wang

2023

Preprint

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Near-fault (NF) pulse-like ground motions have a significant impact on the performance of structures, but their effects on soil liquefaction potential have been relatively understudied. This paper uses 1D effective stress site response analysis capable of modeling porewater pressure (PWP) generation to investigate the seismic site response under NF and general ground motions. The aim is to assess the effects of NF motions on soil liquefaction by considering different soil models and PWP generation models. The results show that NF ground motions generally induce larger ground responses in terms of PWP generation, especially when the durations of the motions are short. This is due to the higher cumulative absolute velocity associated with NF ground motions compared with general ground motions due to a high-velocity pulse under the same peak ground acceleration. However, this effect diminishes as the duration of motion increases. To avoid underestimating seismic demand, especially for small to moderate earthquakes, a preliminary magnitude scale factor modified for the NF effect is suggested for use in conventional soil liquefaction triggering analysis.

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Section: Nonlinear Modelssupporting

confidence: 86%

Numerical study on the effect of near-fault pulse motion on soil liquefaction potential

Tsai,

Li,

Wang

2023

Preprint

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“…However, these models often require many parameters that are difficult to be obtained [35,36]. For this reason, stressbased, strain-based, and energy-based models usually implemented with loosely coupled approaches in 1D non-linear analysis codes are the most used in designing [37].…”

Section: Introductionmentioning

confidence: 99%

Energy-Based Pore Pressure Generation Models in Silty Sands under Earthquake Loading

Tomasello,

Porcino

2024

Geosciences

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During an earthquake, excess pore water pressure generation in saturated silty sands causes a reduction in shear strength and even liquefaction of the soil. A comprehensive experimental program consisting of undrained cyclic simple-shear tests was undertaken to explore the key factors affecting the energy-based excess pore water pressure generation models for non-plastic silty sands. The examined influencing factors were non-plastic fines content (less than and greater than the threshold value ≅ 25%), packing density, vertical effective stress, applied cyclic stress ratio, and soil fabric. The relationship between excess pore water pressure ratio and dissipated energy per unit volume was found to be mainly dependent on the relative density and fines content of soil, whereas the cyclic stress ratio, initial vertical effective stress, and soil fabric (i.e. the reconstitution method) appeared to have a minor impact. A revision of the original energy-based model developed for clean sand by Berrill and Davis was proposed to improve prediction accuracy in terms of residual excess pore water pressures versus normalised cumulative dissipated energy. Nonlinear multivariable regression analyses were performed to develop correlations for the calibration parameters of the revised model. Lastly, these correlations were validated through additional cyclic simple-shear tests performed on different silty sands recovered at a site where liquefaction occurred after the 2012 Emilia Romagna (Italy) earthquake.

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Correlations between pore water pressure development in sandy soil and CAV-based ground motion intensity measures

Tsai

Wang²,

Huang³

et al. 2022

Engineering Geology

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Testing performance of pore pressure models implemented in one-dimensional site response analysis program against centrifuge test data measured in mildly sloping ground

Cited by 4 publications

References 23 publications

Numerical study on the effect of near-fault pulse motion on soil liquefaction potential

Numerical study on the effect of near-fault pulse motion on soil liquefaction potential

Energy-Based Pore Pressure Generation Models in Silty Sands under Earthquake Loading

Correlations between pore water pressure development in sandy soil and CAV-based ground motion intensity measures

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