Experimental Study on Consolidation Characteristics of Compacted Loess

Li, Jinhua; Song, Zhao; Wang, Xiong; Hao, Jiaqi; Zhi, Bin; Zhang, Hui; Deng, Botuan

doi:10.1155/2021/6687858

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…There was a total of 60 samples for the triaxial test, with each sample made into a cylindrical reconstituted specimen with a diameter of 3.91 cm and a height of 8 cm. These samples were divided into three groups based on dry densities of 1.3 g/cm 3 , 1.4 g/cm 3 , and 1.5 g/cm 3 , with each group having four different water contents of 14%, 16%, 18%, 20%, and 22% and confining pressures set at 100 kPa, 200 kPa, 300 kPa, and 400 kPa, as shown in Table 2. The isotropic compression test included saturated reconstituted specimen specimens at three dry densities and unsaturated reconstituted specimens with a saturation degree of 60%.…”

Section: Testing Proceduresmentioning

confidence: 99%

“…In these arid and semi-arid regions, the groundwater level is generally deep, resulting in the soil often being in a partially saturated state. With large-scale engineering projects such as flat mountain construction in the hilly and gully areas of the Loess Plateau [2], engineering practices are based on compacted unsaturated loess, including loess foundations [3] and loess subgrades [4].…”

Section: Introductionmentioning

confidence: 99%

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Deformation and Strength of Unsaturated Loess—Hydraulic Coupling Effects under Loads

Chai,

Li,

Qin

et al. 2024

Water

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The volumetric change in unsaturated loess during loading causes serious damage to the foundation and structure, accompanied by changes in hydraulic conditions. Therefore, quantifying the change in the load effect of loess under hydraulic coupling is of great significance for revealing the mechanism of hydraulic interaction. This study conducts isotropic compression and undrained shear tests on unsaturated compacted loess, simultaneously introducing the strength parameter η to enhance the Glasgow coupled model (GCM). The objective is to elucidate the hydraulic and mechanical coupling mechanism, where saturation increases under mechanical effects lead to strength degradation. The results show that saturation increases under mechanical effects improve the compressibility of the sample, and saturation has a direct impact on the stress–strain relationship. The increase in water content and confining pressure increases the trend of the critical state stress ratio M decreasing, and the strain softening trend increases. The compression of volume during shear tests increases the saturation, changes the hydraulic characteristics of loess, and affects the deformation and strength of loess. The modified GCM improves the applicability and prediction accuracy of unsaturated loess under the same initial state. The research results are of great significance for revealing the hydraulic and mechanical behavior of loess.

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Section: Testing Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deformation and Strength of Unsaturated Loess—Hydraulic Coupling Effects under Loads

Chai,

Li,

Qin

et al. 2024

Water

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“…In engineering practices, the compacted loess is widely used as the construction material, such as high-fills, embankments, and landfill covers [1][2][3][4][5]. As a typical structural soil, the deformation behavior of loess is significantly influenced by water content.…”

Section: Introductionmentioning

confidence: 99%

Effects of Compaction Water Content on Water Retention and Deformation Behavior of Compacted Loess

Di,

Zhang,

Zhou

et al. 2024

Advances in Civil Engineering

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Compacted loess is widely used as a construction material in engineering practices. The compaction dry density and compaction water content have significant effects on the hydromechanical behavior of compacted loess, thereby influencing the serviceability and safety of engineering structures. The former was widely studied in previous studies, while the latter is rarely known. In this study, the water retention, compression, and collapse behavior of compacted loess at different compaction water contents are investigated through pressure plate and oedometer tests. Microstructure analysis was carried out for insight analysis of the test results. The air entry value and yield stress of compacted loess decreased by 64% and 50%, respectively, with the compaction water content increasing from 12.4% to 19.0%. This is due to the fact that the number of clods increases with increasing the compaction water content, leading to many large-sized pores (i.e., diameter > 1,000 μm) and weaker soil skeletons. The influence of compaction water content on the water retention and compression behavior of loess is more pronounced at lower compaction dry densities and lower testing water contents, respectively. In addition, the specimen shows smaller collapse indexes at higher compaction water contents, mainly because of the larger deformation induced by the initial compression.

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Secondary consolidation characteristics of organic soil modified by bio-enzyme based on the Gibson model

Zhang

Cheng

2022

Front. Mater.

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In order to study the secondary consolidation characteristics of organic soil improved by bio-enzyme, the secondary consolidation test was carried out. First, the Gibson rheological model parameters were fitted according to the experimental results. Then, the relationship between rheological model parameters, Ca/Cc value, secondary consolidation coefficient Ca, and load was analyzed for different ratios of bio-enzyme. The results showed that: 1) the rheological model parameters were negatively correlated with the ratios of bio-enzyme and positively correlated with the load value. The rheological model parameters E1 (Kelvin elastic modulus) and η (Kelvin viscosity coefficient) reached the maximum value when the ratio of bio-enzyme was 0.01%. 2) The secondary consolidation coefficient was related to the load and showed a certain law. At 100 kPa, the secondary consolidation coefficient of samples reached the peak. When it was less than 200 kPa, the secondary consolidation coefficient changed obviously with the increase in load. When the load was greater than 200 kPa, the variation trend of the secondary consolidation coefficient tended to be gentle with the increase in load and finally tended to be constant. With the increase in load, the secondary consolidation coefficient Ca finally approached to a stable value. 3) The value of Ca/Cc of improved organic soil varied from 0.042 to 0.1 under various loads. In this article, the secondary consolidation characteristics of organic soil modified by bio-enzyme were studied. The secondary consolidation strain can be predicted by the established rheological model parameter equations.

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Experimental Study on Consolidation Characteristics of Compacted Loess

Cited by 3 publications

References 17 publications

Deformation and Strength of Unsaturated Loess—Hydraulic Coupling Effects under Loads

Deformation and Strength of Unsaturated Loess—Hydraulic Coupling Effects under Loads

Effects of Compaction Water Content on Water Retention and Deformation Behavior of Compacted Loess

Secondary consolidation characteristics of organic soil modified by bio-enzyme based on the Gibson model

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