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- Title
Pore-fractal-permeability model and its experimental analysis of construction waste filling body with high fine-particle content.
- Authors
Ji, Hongying; Feng, Yapeng; Li, Huan; Xin, Yajun; Li, Jianlin; Zhang, Dongying; Gao, Zhongguo; Ren, Jinwu
- Abstract
Construction waste with more fine particle occupies the amount of land and the utilization rate is low. Using fine-particle construction waste to fill mining gob is an effective way to release land resources and to slow down surface subsidence in mine area. The permeability of filling body is the key factor to affect the geological environment and regional hydrological cycle of filling gob. The paper analyzed respectively the components of fine particle and large-size particle of construction waste by the diffraction analysis, explored the formation mechanism of seepage pore in construction waste samples containing more fine particle, characterized quantitatively the porosity and seepage path of the samples by Matlab binaryzation and mass fractal dimension respectively, established the pore-fractal-permeability model of construction waste filling samples containing more fine particle, and verified the model by experiment. The study showed that the permeability weakened with the increase of < 2 mm particle (fine-particle) content. Permeability coefficient of the samples containing 15% cement was less than that of non-cemented one when fine-particle content was less than 26.09%, vice versa in fine-particle content more than 26.09% because ineffective pores among the fine-particle samples gathered into regular oval effective pores under cement bonding. Both cementation and permeation reduced the effective porosity of the samples, while their influence was different when they worked together. The influence of permeation on the effective porosity of the samples was greater than that of cementation when fine content was 21.38–46.51%, vice versa in fine content less than 21.38% or more than 46.51%. The effective porosity of the permeable cemented samples was less than the one of the impermeable non-cemented samples in fine content 26.09–46.51%, vice versa in fine content 21.38–26.09%. The Matlab binary of sample images could well characterize the porosity, and the mass fractal dimension could describe the permeation path characteristics in the samples. And the theoretical calculation of the model was in accord with the experimental results.
- Subjects
CONSTRUCTION &; demolition debris; FRACTAL dimensions; MINE subsidences; PARTICULATE matter; HYDROLOGIC cycle
- Publication
Environmental Earth Sciences, 2024, Vol 83, Issue 12, p1
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-024-11664-5