Study on Fractal Characteristics of Mineral Particles in Undisturbed Loess and Lime-Treated Loess

Song, Jian Li; Ma, Jiaxin; Li, Fengyan; Chai, Linna; Chen, Wenfu; Dong, Shi; Li, Xiaojun

doi:10.3390/ma14216549

Cited by 11 publications

(13 citation statements)

References 15 publications

(17 reference statements)

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“…They also contain a small amount of CaO. These substances react with the calcium ion to produce calcium silicate material, increasing soil shear strength and reducing the permeability coefficient [20]. Cement can be used to modify loess because it is a good curing agent.…”

Section: Methodsmentioning

confidence: 99%

Geotechnical Evaluation of Loess Modifications as the Sustainable Compacted Soil Liner Material in Solid Waste Landfill

et al. 2022

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This paper studied the anti-seepage ability of the modified loess by using attapulgite, which is abundant in local areas. The possibility of using the modified loess as the sustainable compacted soil liner material in a solid waste landfill was also considered in this research. The materials were then evaluated using Nuclear Magnetic Resonance (NMR), Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and an Impermeability Mechanism (IM). The experimental results showed that the permeability coefficient of the attapulgite-modified loess decreases significantly with increasing attapulgite content. However, it becomes less significant when the attapulgite level approaches 10%. Both cases can meet the landfill impermeability requirements, based on the attapulgite content remaining at 10%, adding 15% lime or 5% cement, respectively. The triaxial consolidation and drainage experiment was carried out to investigate the shear strength of the materials under three different working circumstances. The stress–strain curves of each specimen were produced, as were the cohesion and internal friction angle values. This research lays the groundwork for using attapulgite-modified loess as a landfill lining material. It establishes a solid platform for future studies on attapulgite adsorption and purifying performance in landfills.

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Section: Methodsmentioning

confidence: 99%

Geotechnical Evaluation of Loess Modifications as the Sustainable Compacted Soil Liner Material in Solid Waste Landfill

et al. 2022

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“…The results show that the gradation of loess is not uniform, the pores in the particles are large, and the loess has high permeability under natural conditions. Song Jian et al [9] also conducted the same physical test of loess and found that natural loess has a large pore structure, uniform soil, and loose soil characteristics. However, attapulgite has been ground and screened in the factory, so the particle size is tiny, with 67% of the particle size between 0.05 and 0.01mm.…”

Section: Basic Properties Of Loess and Attapulgitementioning

confidence: 99%

“…These substances react with calcium ions to form calcium silicate, increasing soil shear strength and reducing the permeability coefficient. Song Jian et al [9] explored the fractal characteristics of the particle size distribution (PSD) of various minerals in loess and lime-treated loess. They found that the fine loess particles after lime treatment were connected, and the soil structure changed from loose to dense.…”

Section: Basic Properties Of Loess and Attapulgitementioning

confidence: 99%

Study on anti-seepage mechanism of attapulgite-modified loess in Northwest China

Zhang,

Ahad

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Loess is distributed widely in the arid areas in northwest China. Lanzhou city is located on the loess plateau, covered by a large area of deep collapsible Malan loess. Collapsible loess is a soft soil in engineering. It has a specific bearing capacity under dry conditions but will collapse after being immersed in water, which is unfavorable to engineering construction. This paper used the attapulgite abundant in the Zhangye City of Gansu Province as a modifier to improve the loess. The permeability test tested the permeability coefficient of the specimens under different dosages of attapulgite. The anti-permeability principle of attapulgite-modified loess was analyzed from the microscopic perspective by electron microscopy scanning (EMS) and nuclear magnetic resonance (NMR). The test results show that the permeability coefficient of attapulgite-modified loess decreases significantly compared with pure loess, but the permeability coefficient decreases gently when the content of attapulgite exceeds 10%. It was found that the anti-permeability mechanism of the modified loess was that the cohesive attapulgite particles filled the macropores of the loess particles, and the acicular attapulgite combined the loess particles to form a sheet structure, which reduced the porosity and permeability of the modified soil.

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“…to control the compactness and stability of subgrade filling. At the same time, polymers, geotextiles and geogrids can be added to the subgrade fill to reduce the differential settlement deformation of the transition section [13][14][15][16][17][18] . These methods can have a significant effect on the differential settlement control of bridge-subgrade transition sections in collapsible loess areas.…”

Section: And Weiwei Wumentioning

confidence: 99%

Long-term monitoring and analysis of the longitudinal differential settlement of an expressway bridge–subgrade transition section in a loess area

Chao

et al. 2022

Sci Rep

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To solve the problem of "bridgehead bumping" in the transition section between the road and bridge of an expressway in a collapsible loess area, a lime–soil compaction pile composite foundation is used for the first time in the transition section between the road and bridge of an expressway in China; the loess subgrade is improved by adding lime, and the subgrade is arranged in a multilayer geogrid for the joint treatment of various engineering measures. At the same time, a new type of precision differential pressure settlement meter is used to monitor the long-term settlement of a bridge–subgrade transition section with a small settlement magnitude after the joint treatment, and the distribution characteristics and variation laws of the settlement along the longitudinal direction of the line are obtained. The results show that the effect is better and the differential settlement is smaller when using a lime–soil compaction pile composite foundation; lime improves the loess subgrade backfill, and the multilayer geogrid addresses the bridge–subgrade transition in the collapsible loess area. The differential settlement and settlement rate of the subgrade and abutment increase with increased monitoring time, and the differential settlement increases gradually, while the growth rate decreases gradually and finally tends to be stable. The differential settlement of the transition section is predicted and analysed by using a hyperbolic curve, exponential curve and their combination in a prediction model, and the prediction analysis shows that the combined prediction model has the best prediction effect. These research results can provide guidance and reference for the design and construction of subgrade structures similar to the wet transition section between roads and bridges.

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Study on Fractal Characteristics of Mineral Particles in Undisturbed Loess and Lime-Treated Loess

Cited by 11 publications

References 15 publications

Geotechnical Evaluation of Loess Modifications as the Sustainable Compacted Soil Liner Material in Solid Waste Landfill

Geotechnical Evaluation of Loess Modifications as the Sustainable Compacted Soil Liner Material in Solid Waste Landfill

Study on anti-seepage mechanism of attapulgite-modified loess in Northwest China

Long-term monitoring and analysis of the longitudinal differential settlement of an expressway bridge–subgrade transition section in a loess area

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