Effect of pre-dynamic loading on dynamic liquefaction of undisturbed loess

Liu, Wei; Wang, Qian; Lin, Guangming; Chen, Wenwu

doi:10.1007/s10518-020-00917-w

Cited by 8 publications

(6 citation statements)

References 70 publications

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“…Figure 6 shows the SEM test results of compacted loess and fly ash modified loess, in which the fly ash modified loess has a fly ash content of 10%, 15%, and 20%, respectively. According to Figure 10(a), although the loess has been compacted, there are still many overhead pores, some particles are still in point contact with each other, and the particles' outline is relatively clear [2,42,47]. However, when the content of fly ash reaches 10% (Figure 10(b)), compared with the mesostructure of compacted loess, although spherical fly ash particles are attached in the pores and particles of soil and there is a certain amount of hydrated cement produced due to hydration and flocculation of fly ash [27,46], there are still a large number of overhead pores in the soil.…”

Section: Discussionmentioning

confidence: 99%

“…However, when the content of fly ash reaches 10% (Figure 10(b)), compared with the mesostructure of compacted loess, although spherical fly ash particles are attached in the pores and particles of soil and there is a certain amount of hydrated cement produced due to hydration and flocculation of fly ash [27,46], there are still a large number of overhead pores in the soil. Although the contact form between particles is partly transformed into surface contact [2,42], there are still many unstable pointcontact forms. erefore, the reinforcement effect of fly ash on the soil skeleton of fly ash modified loess with a content of 10% is still relatively weak, and the filling of overhead pores is relatively limited, so the dynamic parameters change a little.…”

Section: Discussionmentioning

confidence: 99%

“…According to Figure 10(c), when the fly ash content reaches 15%, more spherical fly ash particles and flocculent hydrate produced by fly ash hydration, which can be seen in the field of vision, fill the large pores in the soil, and the outline of some soil particles tends to be fuzzy. Besides, the contact form between particles is mainly surface contact [2,42]. At this time, the dynamic stiffness and antideformation ability of soil at the macro level is further enhanced due to the enhanced cementation between particles produced by hydration reaction.…”

Section: Discussionmentioning

confidence: 99%

“…For the dynamic residual deformation test, under the same consolidation state, the dynamic stress of different amplitudes was applied to three samples with similar physical parameters in each group until large residual deformation occurred. e maximum loading vibration time of each sample was 40 [40][41][42][43][44]. e consolidation and loading conditions of each group of samples are shown in Table 4.…”

Section: Sample Test Equipment and Methodsmentioning

confidence: 99%

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Dynamic Nonlinear and Residual Deformation Behaviors of the Fly Ash‐Modified Loess

Wang¹,

Wang²,

Zhong³

et al. 2021

Shock and Vibration

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Metastable loess soils can deform, inducing geological and engineering disasters. Therefore, the behavior of the loess under dynamic load is gaining massive attention from researchers to improve the strength of the soils. Fly ash mixed with loess can improve strength and reduce construction costs and environmental pollution. Moreover, it has strong economic and social benefits. This paper investigates the influence of fly ash on the dynamic properties of the modified loess through a series of dynamic triaxial tests of the fly ash modified loess with different fly ash contents. The treated soil samples were prepared using a static compaction method in both ends and cured for 28 days. The dynamic shear modulus ratio, the damping ratio, and the dynamic residual strain of the modified loess were analyzed. The variation characteristics of the dynamic shear modulus ratio and damping ratio with the dynamic shear strain of the fly ash modified loess were obtained. The effect of fly ash content on the dynamic nonlinear parameters of the modified loess was also investigated. In addition, the relationship between the dynamic residual strain and the fly ash content was discussed. The results show that the dynamic shear modulus ratio of fly ash modified loess decreases nonlinearly with the increase in the dynamic shear strain. However, the attenuation rate difference of the curves is small. The damping ratio increases gradually with increasing dynamic shear strain. Under a certain dynamic shear strain level, the damping ratio decreases with the increase in the fly ash content. The dynamic residual strain increases with the increase in the dynamic stress. However, it decreases with the increase in the fly ash content. When the fly ash content is between 10% and 20%, the dynamic residual strain of fly ash modified loess is reduced rapidly. However, when the fly ash content exceeds 20%, the dynamic residual strain decreases slowly. The fly ash content of 20% could be suggested as an optimal content for seismic resistance of the loess foundation.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Sample Test Equipment and Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic Nonlinear and Residual Deformation Behaviors of the Fly Ash‐Modified Loess

Wang¹,

Wang²,

Zhong³

et al. 2021

Shock and Vibration

Self Cite

View full text Add to dashboard Cite

show abstract

“…After reaching the target height, pressure application was stopped, and the sample was kept in this state for 10 min to ensure stable internal structure formation. The transfer wetting method used the water film transfer method to increase water content [44,45]. The preparation method of the transfer wetting method was similar to that of the pre-wetting method; an annular sample with 5% moisture content was prepared first.…”

Section: Permeability Coefficient Testmentioning

confidence: 99%

Effects of Sample Preparation Methods on Permeability and Microstructure of Remolded Loess

Ma,

Qiu,

Gao

et al. 2023

Water

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To explore the influence of sample preparation methods on the permeability and microstructure of remolded loess, remolded loess collected from Heifangtai was taken as the research object. A total of 40 sets of falling-head permeability tests were conducted using two commonly used sample preparation methods, and five different dry density and four initial water content conditions. Additionally, the electrical conductivity of the leachate and the microscopic structure of the samples were analyzed. The results demonstrate that compared to the transfer wetting method, the homogeneity of samples prepared using the pre-wetting method is inferior. This difference is particularly evident when the initial water content is high. Due to the long duration of the permeability test, the pore structure is prone to change, resulting in relatively higher permeability coefficients. Moreover, the total dissolved solids (TDS) of the leachate exhibit a significant decrease with increasing seepage time, indicating the loss of soluble salts. Microscopic structural analysis reveals that samples prepared using the pre-wetting method exhibit a greater number of large pores and aggregates, which are intrinsic factors contributing to the observed differences in permeability between the two sample preparation methods. Furthermore, it should be noted that the impact of the sample preparation method on the permeability of remolded loess is more significant when the dry density is relatively low (specifically, less than 1.45 g/cm3). Conversely, when the dry density is higher, the influence becomes less pronounced.

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Review on image-based non-destructive observation methods for soil meso-liquefaction process

Wang,

Wu,

Zhou

et al. 2024

Bull Eng Geol Environ

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Effect of pre-dynamic loading on dynamic liquefaction of undisturbed loess

Cited by 8 publications

References 70 publications

Dynamic Nonlinear and Residual Deformation Behaviors of the Fly Ash‐Modified Loess

Dynamic Nonlinear and Residual Deformation Behaviors of the Fly Ash‐Modified Loess

Effects of Sample Preparation Methods on Permeability and Microstructure of Remolded Loess

Review on image-based non-destructive observation methods for soil meso-liquefaction process

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