Microstructure Features of Powdery Coal-Bearing Soil Based on the Digital Image Measurement Technology and Fractal Theory

Han, Bo; Lu, Guangyin; Zhu, Zhiyong; You-jun, Guo; Zhao, Yunwei

doi:10.1007/s10706-018-0691-8

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…Chain structures at the edges of clay minerals can be observed. It is inferred that the D-W cycles have caused the basic structural units and contact relationships of the particles to readjust; the links between mineral particles have stable layered structures through surface-to-surface contact to chain structures through edge-to-edge, which is different from Han et al [8] in microstructure change. The microstructure from surface-to-surface to surface-to-edge contact was studied under different levels of water content.…”

Section: Internal Friction Anglementioning

confidence: 64%

“…The effect of water content on the shear strength of coal-bearing soil is related to the microstructure and conforms to the fractal theory [7]. Through scanning electron microscope scanning (SEM) and discrete element method (DEM), the microstructure characteristics of the coal-bearing soil with water content had an obvious variation [8,9]. The repeated variety of water content could cause drywet (D-W) cycles, which was a well-known weathering process.…”

Section: Introductionmentioning

confidence: 99%

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Strength of Vegetated Coal-Bearing Soil under Dry-Wet Cycles: An Experimental Study

Huang

Zheng

2021

International Journal of Corrosion

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Strength of vegetated coal-bearing soil is of great significance to evaluate the shallow stability of vegetated slopes in coal-bearing soil regions. This paper takes D-W cycles, dry density, water content, and vegetation root (VR) content as four factors and carries out the triaxial test for the orthogonal design of vegetated coal-bearing soil in southern China. The strength curves of vegetated coal-bearing soil under four factors were obtained. The Taguchi method was used to quantitatively analyse the effects of four factors. The microstructure of coal-bearing soil under D-W cycles and the theory of soil reinforcement by VR were discussed. The results indicated that D-W cycles had a significant effect on the cohesion and internal friction angle ( P < 0.05 ). The internal friction angle was little affected by the water content and VR content, which had considerable influence on the cohesion. The cohesion could be improved with less than 2% VR content. The cohesion was the largest for no D-W cycles, 10% water content, and 2% VR content. The links between mineral particles go from a stable layered structure to unsteadiness chain structure with the increase in the number of D-W cycles.

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Section: Internal Friction Anglementioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Strength of Vegetated Coal-Bearing Soil under Dry-Wet Cycles: An Experimental Study

Huang

Zheng

2021

International Journal of Corrosion

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“…However, the results indicate that adding y ash to the substrate can help increase the germination rate [20]; the germination rate of mix #5 is higher than that of the control mix. Maize straw (P < 0.01) also has a signi cant positive effect on the germination rate.…”

Section: Substrate Mechanical Propertiesmentioning

confidence: 84%

“…Indeed, scholars have explored the effects of different coal ratios on corn growth [19]. However, although CBS contains nutrients that include C and organic matter [20], it is di cult for plants to survive due to the lack of fertility (N and P) within the soil. Furthermore, if the CBS encountered in a project is simply treated as a covering substrate, considerable soil resource wastage and increased project cost will be realized.…”

Section: Introductionmentioning

confidence: 99%

Functionality Optimizing Study On Coal-bearing Soil Ecological Substrates

Huang

Zheng

2022

Preprint

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Ecological restoration is of profound significance for protecting the ecology and engineering safety of coal-bearing soil (CBS) areas. However, the formulations of CBS ecological substrates have rarely been explored. The objective of this study was therefore to evaluate the effects of the CBS:soil ratio (1000:0 g, 750:250 g, 500:500 g, 250:750 g), fly ash content (0, 50 g·kg− 1, 100 g·kg− 1, 150 g·kg− 1), maize straw content (0, 20 g·kg− 1, 40 g·kg− 1, 60 g·kg− 1), and expanded polystyrene (EPS) content (0, 3 g·kg− 1,6 g·kg− 1, 9 g·kg− 1) in an orthogonal design to optimize an ecological substrate according to various physicochemical, nutrient content, mechanical, and vegetation parameters. The results indicated that the CBS:soil ratio had significant effects on the nutrient content and vegetation growth parameters; fly ash dramatically improved the mechanical parameters (shear strength, cohesion, and internal friction angle); maize straw significantly affected the physical parameters and improved the substrate nutrient content; and EPS was the most beneficial to the vegetation germination ratio. A CBS:soil ratio of 1:1 (500:500 g), fly ash content of 100 g·kg− 1, maize straw content of 50 g·kg− 1, and EPS content of 6 g·kg− 1 were determined to produce the optimal mix for the ecological restoration of CBS. The conclusions of this research provide theoretical and practical guidance for the ecological restoration and stabilization protection of CBS slopes.

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“…• The Area Ratio of Bee-like Structure The bee-like structure is a unique nanostructure of bitumen, and its quantity and area may be related to the technical indexes of bitumen. In this paper, the area ratio of the bee-like structure in the AFM image was measured and calculated by the following methods: Firstly, the bee-like structure in the AFM image is removed by using Photoshop software as shown in Figure 7a,b [41]; Secondly, the measure function of Image-Pro-Plus software is used to encode the bee-like structure and read the pixel points P i , as shown in Figure 7c,d [42,43]; Finally, the area ratio of the bee-like structure can be calculated according to Equation (1). All the images in this paper are 256 × 256 pixels, and the pixels are not changed during image processing.…”

Section: Nano-morphological Parametersmentioning

confidence: 99%

Effect of Thermo-Oxidative Ageing on Nano-Morphology of Bitumen

et al. 2019

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In recent years, the research on bitumen has reached the nanometer level, but there are still some problems in the study of the relationship between the atomic force microscope (AFM) nano-morphology and ageing of bitumen. The purpose of this paper is to find out the effect of thermal oxygen ageing on the nano-morphology of bitumen. Atomic force microscope (AFM) test sample of bitumen was prepared in this paper. Area ratio of bee-like structure, roughness, and maximum amplitude were selected as the nano-morphological parameters of the bitumen. The calculation method of nano-parameters was also proposed. Bitumen with different ageing degrees was prepared by thin film oven test (TFOT). Nano-morphological parameters of bitumen with different ageing degrees were obtained by AFM and analyzed with NanoScope Analysis, and the relationships between nano-morphological parameters and bitumen technical indexes after ageing, such as penetration, ductility, softening point, and viscosity were analyzed. The test results show that the wave crests and wave troughs of the bee-like structure on the surface of the bitumen alternate, while the other areas are relatively flat. The bee-like structure continues to develop as the ageing time prolongs, and the number of bee-like structures decreases, but the volume and the undulation degree increase. With the ageing time prolonging, the nano-parameters of bitumen, such as the area ratio of bee-like structure, roughness, and maximum amplitude, show a trend of increasing gradually, but the increasing rates become smaller and smaller. During the ageing process of bitumen, with the increase of nano-morphological parameters (area ratio of bee-like structure, roughness, and maximum amplitude), penetration at 25 °C and ductility at 15 °C of the bitumen decrease, and softening point and viscosity at 60 °C increase. AFM testing technology and image analysis method in this paper can be used for a reference in the nano-scale study of bitumen.

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Microstructure Features of Powdery Coal-Bearing Soil Based on the Digital Image Measurement Technology and Fractal Theory

Cited by 9 publications

References 21 publications

Strength of Vegetated Coal-Bearing Soil under Dry-Wet Cycles: An Experimental Study

Strength of Vegetated Coal-Bearing Soil under Dry-Wet Cycles: An Experimental Study

Functionality Optimizing Study On Coal-bearing Soil Ecological Substrates

Effect of Thermo-Oxidative Ageing on Nano-Morphology of Bitumen

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