Fractal analysis of small-micro pores and estimation of permeability of loess using mercury intrusion porosimetry

Lu, Tuo; Yaming, Tang; Tie, Yongbo; Hong, Bo; Feng, Wei

doi:10.1631/jzus.a2200528

Cited by 2 publications

(2 citation statements)

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“…At optimal moisture content, a water film surrounds particle surfaces, facilitating particle aggregation and the formation of a relatively stable structure (Figure 10a) [11]. During DW seepage, erosion enhances pore connectivity, and cation exchange between Ca 2+ and Na + results in the formation of particle aggregates, creating pathways for water flow [2,11]. Additionally, the DDL thickness on clay particle surfaces increases, as depicted in Figure 10b.…”

Section: Response Mechanism Of Seepage Behaviormentioning

confidence: 99%

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Feasibility of Microbially Induced Carbonate Precipitation to Enhance the Internal Stability of Loess under Zn-Contaminated Seepage Conditions

He,

Guo,

Zhang

2024

Buildings

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Loess is widely distributed in Northwestern China and serves as the preferred engineering construction material for anti-fouling barriers. Heavy metal contamination in soil presents significant challenges to the engineering safety of vulnerable loess structures. Hence, there is an urgent need to investigate the impact of heavy metal ions on their percolation performance. In order to investigate the effectiveness of microbially induced carbonate precipitation (MICP) using Sporosarcina pasturii (CGMCC1.3687) bacteria in reducing internal seepage erosion, a saturated permeability test was conducted on reshaped loess under constant water head saturation conditions. The response of loess to deionized water (DW) and ZnCl2 solution seepages was analyzed by monitoring changes in cation concentration over time, measuring Zeta potential, and using scanning electron microscopy (SEM). The results indicate that the hydrolysis of Zn2+ creates an acidic environment, leading to the dissolution of carbonate minerals in the loess, which enhances its permeability. The adsorption of Zn2+ ions and the resulting diffusion double-layer (DDL) effect reduce the thickness of the diffusion layer and increase the number of free water channels. Additionally, the permeability of loess exposed to ZnCl2 solution seepage significantly increased by 554.5% compared to loess exposed to deionized water (DW) seepage. Following the seepage of ZnCl2 solutions, changes in micropore area ratio were observed, decreasing by 48.80%, while mesopore areas increased by 23.9%. MICP treatment helps reduce erosion and volume shrinkage in contaminated loess. Carbonate precipitation enhances the erosion resistance of contaminated loess by absorbing or coating fine particles and creating bridging connections with coarse particles. These research results offer new perspectives on enhancing the seepage properties of saturated loess in the presence of heavy metal erosion and the geochemical mechanisms involved.

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Section: Response Mechanism Of Seepage Behaviormentioning

confidence: 99%

“…Loess, which covers approximately 9.3% of the Earth's land surface, is commonly found in arid and semi-arid regions [1][2][3]. It is utilized in various engineering projects for foundations, building materials, and constructing underground anti-fouling barriers to treat heavy metal-contaminated soil.…”

Section: Introductionmentioning

confidence: 99%