Unified modeling of soil behaviors before/after flow liquefaction

Yao, Bin; Ni, Xueqian; Huang, Yu; Zhang, Feng

doi:10.1016/j.compgeo.2018.06.011

“…The reason is that the liquefaction resistance of the foundation soil increases with the increase of soil relative density. Therefore, a higher pore pressure ratio is required in the foundation with higher relative density to achieve the corresponding fluid characteristics, which has been confirmed in previous studies [29]. When the foundation soil is at a low pore pressure ratio level, the change of pile internal force and deformation response with the development of pore pressure ratio is not obvious, especially in the foundation with higher initial relative density.…”

Section: Initial Relative Density Of Soilsupporting

confidence: 54%

“…Proper assessment of the characteristics of liquefied soil is necessary for the analysis of the liquefiable soil-pile interaction. Various studies have shown that the liquefied soil behaves like fluid [3,[25][26][27][28][29][30] and exhibits rate-dependent characteristics [13,31,32] which are caused by viscous nature [32]. Wang.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-static Simplified Analysis Method of the Pile-liquefiable Soil Interaction Considering Rate-dependent Characteristics

Zhang¹,

Ji²,

Gao³

et al. 2021

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0

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The lateral pressure generated by liquefied soil on pile is a critical parameter in the analysis of soil-pile interaction in liquefaction-susceptible sites. Previous studies have shown that liquefied sand behaves like a non-Newton fluid, and its effect on piles has rate-dependent properties. In this study, a simplified pseudo-static method for liquefiable soil-pile interaction analysis is proposed by treating the liquefied soil as a thixotropic fluid, which considers the rate-dependent behavior. The viscous shear force generated by the relative movement between the viscous fluid (whose viscosity coefficient varies with excess pore pressure and shear strain rate) and the pile was assumed to be the lateral load on the pile. The results from the simplified analysis show that the distribution of bending moment is in good agreement with experiments data. Besides, the effects of various parameters, including relative density, thickness ratio of non-liquefiable layer to liquefiable layer, and frequency of input ground motion, on the pile-soil rate-dependent interaction were discussed in detail.

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“…e reason is that the liquefaction resistance of the foundation soil increases with the increase of soil relative density. erefore, a higher pore pressure ratio is required in the foundation with higher relative density to achieve the corresponding uid characteristics, which has been conrmed in previous studies [31]. When the foundation soil is at a low pore pressure ratio level, the change of pile internal force and deformation response with the development of pore pressure ratio is not obvious, especially in the foundation with higher initial relative density.…”

Section: Initial Relative Density Of Soilmentioning

confidence: 72%

“…Proper assessment of the characteristics of lique ed soil is necessary for the analysis of the lique able soil-pile interaction. Various studies have shown that the lique ed soil behaves like uid [3,[27][28][29][30][31][32] and exhibits rate-dependent characteristics [13,33,34], which are caused by viscous nature [34]. Wang et al [35] considered the soil fabric as a uid net-type structure and presented a uni ed thixotropic uid model describing the behavior of the lique able soil in response to cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-static Simplified Analysis Method of the Pile-liquefiable Soil Interaction Considering Rate-dependent Characteristics

Zhang¹,

Ji²,

Gao³

et al. 2022

Preprint

0

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The lateral pressure generated by liquefied soil on pile is a critical parameter in the analysis of soil-pile interaction in liquefaction-susceptible sites. Previous studies have shown that liquefied sand behaves like a non-Newton fluid, and its effect on piles has rate-dependent properties. In this study, a simplified pseudo-static method for liquefiable soil-pile interaction analysis is proposed by treating the liquefied soil as a thixotropic fluid, which considers the rate-dependent behavior. The viscous shear force generated by the relative movement between the viscous fluid (whose viscosity coefficient varies with excess pore pressure and shear strain rate) and the pile was assumed to be the lateral load on the pile. The results from the simplified analysis show that the distribution of bending moment is in good agreement with experiments data. Besides, the effects of various parameters, including relative density, thickness ratio of non-liquefiable layer to liquefiable layer, and frequency of input ground motion, on the pile-soil rate-dependent interaction were discussed in detail.

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“…It is a continuous transformation process during which the internal structure and properties of saturated sandy soil undergo continuous changes, gradually transitioning from a solid to a liquid state [17]. The transformation process from solid to liquid and the properties of the solid and liquid phases during the liquefaction process are key issues in describing the entire liquefaction process of saturated sandy soil [18]. The main factors influencing soil liquefaction include saturation, density, stress history, and initial shear stress [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Strength and Liquefaction Characteristics of Sand under Dynamic Loading

Cai

¹

,

Zhang

²

,

Qi

³

et al. 2023

Sustainability

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To investigate the influence of moisture content, density, and loading frequency on the dynamic strength and liquefaction characteristics of sandy soil, a series of vibration triaxial tests were designed and conducted. The tests were divided into incremental loading tests and cyclic loading failure tests. The results of the incremental loading tests indicated that the shear modulus decreases with increasing moisture content and density, while it increases with increasing loading frequency. The damping ratio of unsaturated samples showed no significant correlation with moisture content, whereas samples with a density above 50% exhibited an increasing trend in damping ratio with increasing density. The damping characteristics of the sandy soil were found to be related to the loading frequency, exhibiting the characteristics of viscous damping. The results of the cyclic loading tests revealed that the dynamic failure mode of the sand soil is the ultimate equilibrium failure mode. Increasing moisture content and decreasing density make the samples more susceptible to failure. During the process of cyclic loading leading to dynamic failure, the shear modulus of unsaturated samples remains constant, while the shear modulus of saturated samples gradually decreases. The damping ratio of saturated soil is significantly higher than that of unsaturated soil. During the process of cyclic loading leading to dynamic failure, the damping ratio of saturated soil shows no apparent correlation with loading frequency, but it decreases with increasing density.

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Unified modeling of soil behaviors before/after flow liquefaction

Cited by 23 publications

References 31 publications

Pseudo-static Simplified Analysis Method of the Pile-liquefiable Soil Interaction Considering Rate-dependent Characteristics

Pseudo-static Simplified Analysis Method of the Pile-liquefiable Soil Interaction Considering Rate-dependent Characteristics

Pseudo-static Simplified Analysis Method of the Pile-liquefiable Soil Interaction Considering Rate-dependent Characteristics

Experimental Study on Strength and Liquefaction Characteristics of Sand under Dynamic Loading

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