Collapse behavior and microstructural alteration of remolded loess under graded wetting tests

Shao, Xianxian; Zhang, Huyuan; Tan, Yu

doi:10.1016/j.enggeo.2017.11.025

Cited by 154 publications

(44 citation statements)

References 31 publications

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“…These results are qualitatively in agreement with previous data reported for natural and compacted loess (e.g. Phien-wej et al, 1992; Muñoz-Castelblanco et al, 2011; Shao et al, 2018). Figure 9 shows the evolution of the recompression index Cr = -∆e/∆log(σv) (for σv < σyield) as well as the compression index Cc = -∆e/∆log(σv) (for σv > σyield), estimated from the compressibility curves presented in Figure 6.…”

Section: Test Resultssupporting

confidence: 94%

Collapse behaviour of compacted loess: role of the stress level on soil microstructure

Pineda

Sheng

et al. 2019

JGS Special Publication

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The paper presents preliminary results of an experimental study aimed at evaluating the influence of soil microstructure on the collapse behaviour of compacted loess from Xi'an, Shannxi province, China. Collapse behaviour was evaluated from one-dimensional compression tests in which compacted specimens were loaded to different vertical stresses, under constant water content conditions, prior soaking. Mercury intrusion porosimetry (MIP) tests and Scanning Electron Microscopy (SEM) analysis reveals a strong influence of the stress level on the soil microstructure formed by soaking under zero lateral deformation conditions.

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Section: Test Resultssupporting

confidence: 94%

Collapse behaviour of compacted loess: role of the stress level on soil microstructure

Pineda

Sheng

et al. 2019

JGS Special Publication

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“…For example, as the initial water content and dry density increase, collapsibility tends to decrease 7 – 11 . It is widely accepted that the difference in collapsing is also reflected in the microstructure of the soil 12 , 13 . Numerous studies have shown that changes in the accumulation state of loess can also affect collapsibility 14 .…”

Section: Introductionmentioning

confidence: 99%

Mining and analysis of multiple association rules between the Xining loess collapsibility and physical parameters

Yan-peng³

et al. 2021

Sci Rep

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Collapsibility determination in loess area is expensive, and it also requires a large amount of experimentation. This paper aims to find the association rules between physical parameters and collapsibility of the loess in Xining through the method of data mining, so to help researchers predict the collapsibility of loess. Related physical parameters of loess collapsibility, collected from 1039 samples, involve 13 potential influence factors. According to Grey Relational Analysis, the key influence factors that lead to collapsing are identified from these potential influence factors. Subsequently, take the key influence factors, δs (coefficient of collapsibility) and δzs (coefficient of collapsibility under overburden pressure) as input items, and use the Apriori algorithm to find multiple association rules between them. Then, through analysing the results of association rules between these key influence factors and collapsibility, the evaluation criteria for collapsibility in this area is proposed, which can be used to simplify the workload of determining collapsibility. Finally, based on these research results, recommendations for projects construction were made to ensure the safety of construction in the area.

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“…Gu et al [32] conducted an experimental study on the permeability of undisturbed soil, remolded soil, and solidified soil of clay. The collapsibility of remolded loess was studied, and the change of loess microstructure was observed by microscope [33]. The collapsible loess was studied by the method of high-energy dynamic compaction.…”

Section: Introductionmentioning

confidence: 99%

Infiltration Law of Water in Undisturbed Loess and Backfill

Meng

Liao

Zhang

2020

Water

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Loess has the characteristics of complex structure and reduced mechanical strength after encountering water. In Chinese loess areas, irrigation, water storage, and rainfall affect the stability of the original loess structure and cause damage to the foundation. This paper analyzes the results of in situ water immersion test (in order to study the permeability of water storage in undisturbed loess), rainfall test (in order to study the permeability of rainwater in the backfill loess), and water storage test (in order to study the permeability characteristics of water storage in backfill loess) on the filling site and studies the permeability law of water in unsaturated layered loess and backfill remolded loess. The results of the in situ immersion test show that the vertical seepage velocity of water was very fast, and the infiltration depth was close to 25 m after 9 days of water storage, and at the interface of the new loess, the paleosol, and the old loess, the water infiltration line appeared to be refracted. Finally, the vertical and horizontal penetrations of water in the loess are analyzed, and the range of water immersion and saturation are determined. Through the rain test and water storage test of a loess-filled surface, the relationship between the moisture content and depth of the backfill loess before and after rainfall and storage is obtained. The results of rain period test show that the water infiltrated into the loess about 3 m after 25 days of rainfall. A further 90 days storage test shows that the final infiltration depth of water was about 7 m.

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Collapse behavior and microstructural alteration of remolded loess under graded wetting tests

Cited by 154 publications

References 31 publications

Collapse behaviour of compacted loess: role of the stress level on soil microstructure

Collapse behaviour of compacted loess: role of the stress level on soil microstructure

Mining and analysis of multiple association rules between the Xining loess collapsibility and physical parameters

Infiltration Law of Water in Undisturbed Loess and Backfill

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