Study on settlement deformation of high fill foundation in large thickness loess area

Zhao, Zhuangfu; Yan-peng, Zhu; Ye, Shuaihua

doi:10.1007/s12517-021-07569-3

Cited by 12 publications

(5 citation statements)

References 30 publications

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“…This is mainly because the water film on the surface of soil grains is thin when the water content is small, the linkage between soil grains is strong, and the soil skeleton composed of soil grains, intergrain cement, and shrinkage film is not easily deformed under the action of additional pressure, the structure of the soil sample is not destroyed, the compressibility of the soil is not great, and the soil is in the elastic stage [50]. When the water content continues to increase, the water film on the surface of soil grains thickens, the linkage between soil grains is weakened, the loess skeleton is easily deformed under the action of additional pressure, the compressibility of the structural soil increases sharply, and the soil sample gradually becomes softer during the compaction process but shows the characteristics of easy compression [51].…”

Section: Effect Of Moisture Content On Compressibilitymentioning

confidence: 99%

Influence of Moisture Content and Dry Density on the Compressibility of Disturbed Loess: A Case Study in Yan’an City, China

Yang

et al. 2023

Sustainability

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Loess is a kind of soil that experiences a long period of deposition, and it is relatively stable under natural conditions. However, in the process of engineering construction in loess areas, the original soil structures of the loess are destroyed, inducing changes in the composition and water content in the loess. These changes may cause different environmental and engineering geologic problems. To reveal the engineering properties of disturbed losses in the Chinese Loess Plateau, the physical properties of 135 groups of disturbed loess samples in Yan’an City were analyzed statistically, and the compression properties of loess with different moisture contents and dry densities were studied by high-pressure consolidation experiments. We elucidate the compressive deformation law for perturbed solids at different moisture contents and dry densities. The experimental results show that the water content rate for the best compaction performance of the disturbed loess is 16%. The compressive deformation coefficient generally decreases with increasing dry density and water content. However, when the soil moisture is low, a small amount of water and salt is concentrated in the contact position of the powder, and the soluble salt is condensed into cement. The molecular forces between particles and the bonding forces of bound water and capillary water are larger. The soil forms a porous structure with coarse grains as the main skeleton, and the cement bonding strength is strong at the contact points of the coarse grains. As a result, the loess shows high intensity at low-water content. This results in a compression-deformation coefficient that increases with dryness density in the small load range.

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Section: Effect Of Moisture Content On Compressibilitymentioning

confidence: 99%

Influence of Moisture Content and Dry Density on the Compressibility of Disturbed Loess: A Case Study in Yan’an City, China

Yang

et al. 2023

Sustainability

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“…With the rapid economic development of northwest China, a large number of projects of "Cutting Mountains, Filling Ditches, And Creating Land" have been carried out to alleviate the scarcity of land resources, accompanied by many high-fill foundations and high-fill slope projects with loess as filler 1 , 2 . Due to the difference of filling quality and filling thickness, consolidation settlement, collapsible settlement and uneven settlement are easy to occur under the action of self-weight load and other external factors (e.g., earthquake) 3 , 4 . The macroscopic performance is that the slope produces fissures (Fig.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of loess fill slope supported by frame prestressed anchors considering tensile strength cut-off

Zhao,

Zhu,

Hou

et al. 2024

Sci Rep

Self Cite

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In the stability analysis of loess fill slope, the fissure nature of loess is often ignored, which makes the stability calculation of fill slope too conservative. Based on the upper limit theory of plastic limit analysis, the stability analysis model of loess-filled fissured slope supported by frame prestressed anchors was established. Considering the tensile strength cut-off yield property of soil, the stability coefficient of slope was calculated, and the influence of different factors on slope stability was analyzed. The results show that ignoring the fissures in loess will overestimate the stability of the fill slope, and the support structure can significantly improve the stability of the loess-filled fissure slope. The research results of this paper can further enrich the stability analysis theory of loess-filled fissured slope supported by frame prestressed anchors, which is of great significance to guide engineering practice.

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“…The monitoring of the gypsum mine hollow area found that the surface deformation was mainly horizontal displacement, and the direction of the horizontal displacement was overall pointing to the hollow area (Xu et al, 2023). The effect of rainfall on wet submerged loess is very significant and can trigger strong inhomogeneous settlement phenomena (Zhao, 2022).…”

Section: Introductionmentioning

confidence: 99%

Study on deformation characteristics of underground pipeline corridors and uneven settlement factors of foundations in sandy chalky soil layer

Zhang,

Duan,

et al. 2024

Front. Earth Sci.

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Uneven settlement phenomenon is very easy to occur in the sandy pulverized ground stratum, the underground pipe corridor longitudinal and transverse stiffness difference is obvious, so that it is easy to crack and deformation due to uneven settlement in this type of stratum. This paper carries out research on uneven settlement and cracking and deformation of Qihe tube corridor, analyzes the reasons leading to uneven settlement and the factors affecting the deformation and cracking of the tube corridor, and provides guidance for foundation treatment and tube corridor repair and mixing and reinforcement. It was found that the concrete structure of the corridor itself had exposed reinforcement, pockmarks and holes, and that cracks on the structure of the corridor sprouted and expanded from these defects. Defects and damages on the concrete structure of the pipeline corridor are contributing factors to the deformation and cracking of the members, and the uneven settlement of the foundation is the main initiating factor for the cracking and deformation. The analysis of the numerical simulation results of similar underground pipeline corridors is carried out, and it is found that the simulation results are consistent with the deformation characteristics of the Qihe pipeline corridor, which further supports the conclusions of this paper. The main stratigraphic factors contributing to the inhomogeneous settlement were found to be the water-rich and loose bodies in the lower part of the strata, as revealed by the physical means and the experimental verification boreholes. Localized hydraulic effects such as pumping further accelerate the uneven settlement of the foundation.

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Study on settlement deformation of high fill foundation in large thickness loess area

Cited by 12 publications

References 30 publications

Influence of Moisture Content and Dry Density on the Compressibility of Disturbed Loess: A Case Study in Yan’an City, China

Influence of Moisture Content and Dry Density on the Compressibility of Disturbed Loess: A Case Study in Yan’an City, China

Stability analysis of loess fill slope supported by frame prestressed anchors considering tensile strength cut-off

Study on deformation characteristics of underground pipeline corridors and uneven settlement factors of foundations in sandy chalky soil layer

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