Effects of lime treatment on the hydraulic conductivity and microstructure of loess

Gao, Yanfang; Qian, Hui; Li, Xinyan; Chen, Jie; Jia, Hui

doi:10.1007/s12665-018-7715-9

Cited by 82 publications

(40 citation statements)

References 56 publications

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“…Saturated hydraulic conductivity is a key hydraulic parameter for controlling water infiltration and distribution (Dou et al ., ; Damiano et al ., ; Gao et al ., ; Wang et al ., ). The main factors affecting the permeability of the loess–paleosol are its moisture content, porosity, grain‐size, mineralogy and structural characteristics (particle contact mode and arrangement) (Zhao et al ., , ; Liang et al ., ).…”

Section: Discussionmentioning

confidence: 99%

“…The earlier explanations were supported by the changes in illite, chlorite and hornblende content in the XSD sequence (Figures 9f, 9g, and 9h). Permeability characteristics of the XSD sequence Saturated hydraulic conductivity is a key hydraulic parameter for controlling water infiltration and distribution (Dou et al, 2014;Damiano et al, 2017;Gao et al, 2018;Wang et al, 2018). The main factors affecting the permeability of the loess-paleosol are its moisture content, porosity, grain-size, mineralogy and structural characteristics (particle contact mode and arrangement) (Zhao et al, , 2015Liang et al, 2018).…”

Section: Paleoenvironmental Significance Of Mineralsmentioning

confidence: 99%

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Influence of Quaternary paleoclimate change on the permeability of the loess–paleosol sequence in the Loess Plateau, northern China

Hou

Qian

Zhang

et al. 2020

Earth Surf Processes Landf

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Permeability differences in multi‐cycle loess–paleosol aeolian sediments, which are still poorly understood, have the potential to significantly improve our understanding of climatic change during the glacial–interglacial periods of the Quaternary. In this study, the permeability of a well‐preserved and continuous loess–paleosol sequence in the South Jingyang Plateau was investigated. Weathering intensity was inferred using a series of climate proxies including grain‐size distribution, magnetic susceptibility and mineralogy. The results of laboratory tests showed that the average saturated hydraulic conductivity of loess layers is higher than that of paleosol layers. Also, clear differences between loess and paleosol were found in terms of depth variations of the vertical and horizontal saturated hydraulic conductivities. Differences in loess–paleosol were also found for other proxies for pedogenic weathering [i.e. clay content, sand content, Kd value (ratio of coarse silt to clay), magnetic susceptibility, dolomite content and the ratios of hornblende/illite and hornblende/chlorite]. Our results showed a high permeability of loess layers associated with weak pedogenic weathering during cold/dry paleoclimatic conditions in glacial stages. On the contrary, paleosol layers developed in a warm/humid climate during the interglacial stages experienced strong pedogenic weathering that resulted in lower permeability. Based on these results, we construct a connection between Quaternary climate change theory and the modern hydrological system. This provides a scientific basis for investigating the distribution and pollution of groundwater resources in the local region. © 2020 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

Section: Paleoenvironmental Significance Of Mineralsmentioning

confidence: 99%

Influence of Quaternary paleoclimate change on the permeability of the loess–paleosol sequence in the Loess Plateau, northern China

Hou

Qian

Zhang

et al. 2020

Earth Surf Processes Landf

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“…Cuisinier et al [8] found that the addition of lime decreased the maximum dry density of the loess and concurrently affected the hydraulic conductivity of the treated soil. Similarly, Gao et al [9] found that the addition of lime changed the structure of the loess, affecting its mechanical and hydraulic properties and its associated bearing capacity and water flow. e addition of both lime and fly ash has been found to increase the shear strength and compressibility of loess.…”

Section: Introductionmentioning

confidence: 93%

Microscopic Mechanism Affecting Shear Strength in Lignin-Treated Loess Samples

Liu

Wang

Lin

et al. 2019

Advances in Materials Science and Engineering

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In China, engineers have worked to create additional usable land for building construction by flattening the ridges of hills and filling in the adjacent valleys. China’s Loess Plateau comprises a type of soil (loess) with a large pore structure that can collapse and become unstable when exposed to groundwater. Conventional valley fill materials include remolded loess or remolded loess treated with cement, lime, gypsum, or other stabilizing additives. These stabilizers are often detrimental to the surrounding environment. Moreover, loess treated with conventional stabilizers exhibits excessive brittleness, which is not suitable for building foundations. Adequate stability of the building foundations in the filled valleys is required to ensure public safety. In this study, we tested 50 remolded loess samples treated with a lignin polymer compound to determine its potential as a valley fill material. Triaxial tests, scanning electron microscopy (SEM), and X-ray diffraction (XRD) were used to study the mechanical characteristics of each sample, determine the effects of the lignin treatment on the loess, and identify the microscopic mechanism affecting shear stress in the lignin-treated loess. The corresponding development of excess pore pressure and volumetric responses under monotonic triaxial testing were also considered. Based on this study’s results, the optimum lignin content in the treated loess samples was 4%; lignin contents exceeding 4% decreased axial stress and increased dilation after saturation. The shear strength and strain-hardening phenomenon of the lignin-treated loess samples increased as the lignin content increased, while the excess pore water pressure decreased. Microscopically, the addition of lignin increased cohesion in the loess samples, while slightly contributing to the internal friction angle. The use of lignin as a stabilizing additive for valley fill material shows potential for controlling building foundation deformation by increasing soil strength and minimizing environmental impacts by maintaining the soil pH and limiting pollutant production.

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“…Laboratory hydraulic conductivity tests are typically applied to obtain saturated hydraulic conductivity (K sat ) and to describe the ease of water movement through fine and clayey porous media [5,7]. In this study, the K sat of the remolded loess samples was measured via the constant head test method after saturation.…”

Section: K Sat Measurementmentioning

confidence: 99%

“…At present, much experimental research has been conducted on the influence of water and soil interactions on the permeability of soil, both in China and internationally. Several scholars have found that hydration can be induced-to achieve a change of permeability-by adding materials, such as lime, cement, and fly ash, to the soil [7][8][9][10][11]. In addition, in-depth studies have been conducted that have shown that changes of hydraulic conductivity are related to the type and concentration of inorganic solutions [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Chloride Concentration on Saturated Permeability of Remolded Loess

Zhang

Qian

et al. 2020

Minerals

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Loess contains many sodium and chloride ions that can easily be leached when seepage occurs, thus affecting the mechanical properties of loess. This study investigated a series of sodium chloride solution concentrations to explore their influence on the permeability of remolded loess, as well as the underlying mechanism of such. The results indicated that the saturated hydraulic conductivity of remolded loess increases with time in response to different sodium chloride concentrations, and the sample was more permeable with increasing concentration. Moreover, the salt effect promoted the dissolution of calcite and dolomite, and the cation exchange stimulated the leaching of other cations, thus leading to further structural loosening. Furthermore, the aggregation of clay particles increased, thus forming a larger pore space among aggregates and providing effective channels for permeation. These findings provide a theoretical basis for an improved understanding of channel degradation in the loess area of Northwest China.

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Effects of lime treatment on the hydraulic conductivity and microstructure of loess

Cited by 82 publications

References 56 publications

Influence of Quaternary paleoclimate change on the permeability of the loess–paleosol sequence in the Loess Plateau, northern China

Influence of Quaternary paleoclimate change on the permeability of the loess–paleosol sequence in the Loess Plateau, northern China

Microscopic Mechanism Affecting Shear Strength in Lignin-Treated Loess Samples

Effect of Sodium Chloride Concentration on Saturated Permeability of Remolded Loess

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