Cracking and water seepage of Xiashu loess used as landfill cover under wetting–drying cycles

Lu, Haijun; Li, Jixiang; Wang, Weiwei; Wang, Changhong

doi:10.1007/s12665-015-4729-4

Cited by 41 publications

(15 citation statements)

References 19 publications

(13 reference statements)

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“…Two typical weathering processes, dry-wet (D-W) cycles and freeze-thaw (F-T) cycles are common in China's Loess Plateau [27,28], affecting the physical and mechanical properties of its loess [29][30][31], and causing shallow diseases of loess slopes to become more prominent [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Effect of Dry‐Wet Cycles and Freeze‐Thaw Cycles on the Antierosion Ability of Fiber‐Reinforced Loess

Yan

Wang³

et al. 2021

Advances in Materials Science and Engineering

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Compared with plain soil, polypropylene (PP) fiber-reinforced soil has markedly improved mechanical properties and can be used in slope protection projects. To investigate the reduction law of the antierosion ability parameters of PP fiber-reinforced loess under dry-wet (D-W) cycles and freeze-thaw (F-T) cycles, we took loess from Yan’an, China, mixed them with PP fiber, and did shear strength tests, disintegration tests, and permeability tests under D-W cycles and F-T cycles. The experimental results show that D-W cycles or F-T cycles had a less deteriorating effect on the cohesion, disintegration rate, and permeability coefficient of the fiber-reinforced samples than on plain loess; however, the reduction in their internal friction angle was more obvious. Under D-W cycles or F-T cycles, the cohesion and internal friction angle of the reinforced soil decreased as the number of cycles increased, while the disintegration rate and permeability coefficient increased as the number of cycles increased. The relation between the reduction in the antierosion ability parameters of reinforced soil and the number of D-W cycles or F-T cycles accorded with the hyperbolic function fitting results. The most obvious reduction effect the D-W cycles had on the reinforced soil was on the disintegration rate, followed by cohesion, internal friction angle, and permeability coefficient. The most obvious effect of F-T cycles was also on the disintegration rate, followed by cohesion, permeability coefficient, and internal friction angle. Compared with D-W cycles, F-T cycles had a stronger effect on the reduction in the cohesion, disintegration rate, and permeability coefficient of reinforced soil, but the reduction in the friction angle was greater in D-W cycles.

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Section: Introductionmentioning

confidence: 99%

Effect of Dry‐Wet Cycles and Freeze‐Thaw Cycles on the Antierosion Ability of Fiber‐Reinforced Loess

Yan

Wang³

et al. 2021

Advances in Materials Science and Engineering

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“…A further study by Rayhani et al [16] proved that cracking of the large-sized sample would lead to an increase in permeability coefficient, sometimes up to 5-10 orders of magnitude and the permeability coefficient of high-plasticity soil decreased after longer permeation due to self-healing. Lu et al [17] noticed that the pore volume of the loess in landfills grew after dry-wet cycles while the pore size showed little change, and the permeability coefficient increased positively with pore volume and more pronounced cracks. Wan et al [18] analyzed the influence of the liquid limit of compacted clay cushion (CCL) on its structure and permeability after dry-wet cycles, and both the crack ratio and the permeability coefficient grew at higher liquid limit.…”

Section: Introductionmentioning

confidence: 99%

Permeability and Microstructure of a Saline Intact Loess after Dry‐Wet Cycles

Ren

Wang

et al. 2021

Advances in Civil Engineering

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Influenced by both dry-wet cycles and salt weathering, the loess will exhibit significant changes in microstructure and permeability, which threatens the stability of loess slopes. Triaxial permeability tests and industrial computed tomography (CT) scans were carried out on saline intact loess with sodium sulfate. The relationship between permeability and pore structure of the loess after dry-wet cycles was discussed. Results show that the permeability coefficient of loess increases after dry-wet cycles, with the increment declining. After specified dry-wet cycles, the permeability coefficient increases approximately linearly with sodium sulfate content. However, the permeability coefficient significantly declines at higher confining pressures, while its attenuation rate decreases. An empirical relationship based on log 10 1 + e − log 10 k was proposed to estimate the permeability coefficient of saline intact loess considering dry-wet cycles and salt content. Comparisons of measured and calculated results proved its rationality. CT scan images imply the damage to soil microstructure induced by dry-wet cycles and salt weathering, corresponding to the decline of the mean CT value (ME) and the increase of both crack ratio and fractal dimension of crack network.

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“…Few studies explaining the reasons for changes in permeability characteristics under different wetting-drying cycles exist. As the number of wetting-drying cycles increases, the compacted loess strength decreases, permeability increases, and deformation increases, causing urban construction projects to undergo deformation and risk instability or damage, which is not conducive to the sustainable city development [13,14].…”

Section: Introductionmentioning

confidence: 99%

Permeability characteristics and structural evolution of compacted loess under different dry densities and wetting-drying cycles

Yuan

Lü

et al. 2021

PLoS ONE

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Permeability characteristics of compacted loess is always an important topic in soil mechanics and geotechnical engineering. This study explored the permeability characteristics of compacted loess under different dry densities and wetting-drying cycles, and found that as the dry density increases, the compacted loess surface became denser, the saturation permeability coefficient and saturation infiltration rate decreased. However, the wetting-drying cycle presented the opposite result. Meanwhile, the evolution of the microstructure was investigated by Scanning Electron Microscope (SEM) and Nuclear Magnetic Resonance (NMR) to explain the change of its permeability characteristics. The size of compacted loess aggregates was quantitatively analyzed by Image-Pro Plus (IPP) software. It showed that the size of compacted loess aggregates for different dry densities were concentrated from 10–100 μm, occupying 65.0%, 58.19%, and 51.64% of the total aggregates area respectively. And the interesting finding was that the area occupied by 10–50 μm aggregates remained basically unchanged with the number of wetting-drying cycles increasing. Therefore, the size of 10–50 μm aggregates represented the transition zone of compacted loess. NMR analyses revealed that with increasing dry density, the volume of macropores in the compacted loess rapidly decreased, the volume of mesopores and small pores increased. Meanwhile, the change in micropores was relatively small. The pore volume of the compacted loess after three wetting-drying cycles increased by 8.56%, 8.61%, and 6.15%, respectively. The proportion of macropores in the total pore volume shows the most drastic change. Variations in aggregate size and connection relationships made it easier to form overhead structures between aggregates, and the increased of macropore volume will form more water channels. Therefore, the change in permeability characteristics of compacted loess is determined by aggregate size, loess surface morphology, and the total pore volume occupied by macropores.

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Cracking and water seepage of Xiashu loess used as landfill cover under wetting–drying cycles

Cited by 41 publications

References 19 publications

Effect of Dry‐Wet Cycles and Freeze‐Thaw Cycles on the Antierosion Ability of Fiber‐Reinforced Loess

Effect of Dry‐Wet Cycles and Freeze‐Thaw Cycles on the Antierosion Ability of Fiber‐Reinforced Loess

Permeability and Microstructure of a Saline Intact Loess after Dry‐Wet Cycles

Permeability characteristics and structural evolution of compacted loess under different dry densities and wetting-drying cycles

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