Cross-anisotropic stiffness characteristics of a compacted lateritic clay from very small to large strains

Bentil, Obed Takyi; Zhou, Chao; Zhang, Junhui; Liu, Kai

doi:10.1139/cgj-2022-0617

Cited by 3 publications

(1 citation statement)

References 41 publications

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“…It has been found that there is anisotropy in the soil under small strain conditions. Bentil [46] has delved into the anisotropy of the small-strain shear modulus by conducting bending element experiments. The consideration of soil anisotropy in the seismic response analysis of soil layers has been scarce among scholars, primarily due to the complexities involved in studying anisotropy, seismic loads, and their associated intricacies.…”

Section: Introductionmentioning

confidence: 99%

Effect of Soil Anisotropy on Ground Motion Characteristics

Xie,

Cao,

2023

Buildings

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Soil transverse isotropy results in different stiffness characteristics in horizontal and vertical directions. However, the effect is usually neglected in seismic motion analysis. In this study, an equivalent linear anisotropic soil model was established based on the finite element method, and we investigated the impact of anisotropic parameters on ground motion at the site under various seismic wave inputs. It was found that the anisotropic parameters have a more significant effect on seismic waves, with the dominant frequency being closer to the fundamental frequency of the site. As an example, the soil dynamic parameters in Shanghai Yangshan Port were calibrated by a series of bending elements, resonance columns, and cyclic triaxial tests. The influences of anisotropy on the peak ground acceleration (PGA) and response spectrum were studied for Yangshan Port. Additionally, the standard design response spectra considering the soil anisotropy were provided. A comparison reveals that the existing isotropic design response spectrum may lead to dangerous seismic design for the structures at Yangshan port.

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Section: Introductionmentioning

confidence: 99%

Effect of Soil Anisotropy on Ground Motion Characteristics

Xie,

Cao,

2023

Buildings

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Suction and anisotropy effects on the stiffness characteristics of a compacted lateritic clay from small to large strains

Bentil,

Zhou

2024

Can. Geotech. J.

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Lateritic clay has distinct properties from other clays due to its high sesquioxide content. Its stiffness characteristics have not been well understood, especially when the soil is unsaturated and anisotropic. This study investigated the stiffness characteristics of compacted lateritic clay through suction-controlled triaxial compression tests equipped with local strain measurements. Both vertically and horizontally cut specimens were tested to determine the evolution of stiffness anisotropy during shearing. Three suctions (0, 10 and 150 kPa) and two confining pressures (50 and 200 kPa) were considered. When strains are relatively small (e.g., less than 0.2%), the secant Young’s modulus Esec of vertical specimens is consistently higher than that of horizontal specimens at all suctions and stresses due to the inherent anisotropic structure. The degree of anisotropy increases with increasing suction since suction enhances the stiffness significantly more in vertical specimens than in horizontal specimens. This behaviour may be due to an enhanced force chain in the vertical direction during shearing. As strains increase, the degradation of Esec normalized by the maximum Young’s modulus E0 is almost independent of suction and anisotropy. Lateritic clay has a higher degradation rate than other clays with a similar plasticity index because of its aggregated microstructure.

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Effect of Soil Anisotropy on Ground Motion Characteristics

Xie,

Cao,

2023

Preprint

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Soil transverse isotropy results in different stiffness characteristics in the horizontal and vertical directions. However, the effect is usually neglected in the seismic motion analysis. In this study, an equivalent linear anisotropic soil model was established based on the finite element method and investigated the impact of anisotropic parameters on ground motion at the site under various seismic wave inputs. It is found that the anisotropic parameters have a more significant effect for the seismic waves with the dominant frequency closer to the fundamental frequency of the site. As an example, the soil dynamic parameters in Shanghai Yangshan Port were calibrated by a series of bending elements, resonance columns, and cyclic triaxial tests. The influences of anisotropy on the peak ground acceleration (PGA) and response spectrum are studied for Yangshan Port. Addi-tionally, the standard design response spectra considering the soil anisotropy were provided. A comparison reveals that the existing isotropic design response spectrum may lead to dangerous seismic design for the structures at Yangshan port.

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Cross-anisotropic stiffness characteristics of a compacted lateritic clay from very small to large strains

Cited by 3 publications

References 41 publications

Effect of Soil Anisotropy on Ground Motion Characteristics

Effect of Soil Anisotropy on Ground Motion Characteristics

Suction and anisotropy effects on the stiffness characteristics of a compacted lateritic clay from small to large strains

Effect of Soil Anisotropy on Ground Motion Characteristics

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