Effect of straw reinforcement on the shearing and creep behaviours of Quaternary loess

Xue, Zhong-Fei; Cheng, Wen-Chieh; Wang, Lin

doi:10.1038/s41598-021-99318-5

Cited by 8 publications

(4 citation statements)

References 58 publications

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“…The Burgers model, as shown in Fig. 4, can well describe the creep characteristics of the holding pressure stage of agricultural fiber materials, such as corn straw, which consists of a Maxwell body and a Kelvin body in series (Ma et al 2017(Ma et al , 2022Maraldi et al 2018;Xue et al 2021;Wang et al 2022).…”

Section: Construction Of Virtual Model For Creep Test Macroscopic Bur...mentioning

confidence: 99%

Creep characteristics of corn straw particles simulated based on Burgers model

Ma,

Wang,

Wang

et al. 2023

BioRes

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To simulate the creep characteristics of corn straw particles under uniaxial compression, a 6-level 2D model was created using PFC 2D software according to the actual uniaxial creep test, the grain size, and shape of corn straw particles. Five groups of controlled tests were designed by the control variable method to study the influence of Maxwell body parameters Em, ηm; Kelvin body parameters Ek, ηk; and friction coefficient f on the creep curve of Burgers model. Results revealed that the creep characteristics of corn straw are affected by these 5 parameters. After multiple debugging by trial-and-error method, simulation parameters suitable for describing the creep characteristics of corn straw particles were obtained. The creep curves obtained by simulation under these parameters are consistent with those obtained by physical tests. It was shown that PFC software can not only study the creep characteristics of geotechnical materials, but also study the creep characteristics of agricultural fiber materials, which provides a reference for the subsequent rheological characteristics of biomass materials.

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Section: Construction Of Virtual Model For Creep Test Macroscopic Bur...mentioning

confidence: 99%

Creep characteristics of corn straw particles simulated based on Burgers model

Ma,

Wang,

Wang

et al. 2023

BioRes

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“…Metallurgical processes, metal smelting activities, and inappropriate wastewater disposal discharge heavy metals into soils and groundwater, hence resulting in serious ecological environmental pollution ( Nakata et al, 2017 ; Vital et al, 2018 ; Bai et al, 2021a ; Bai et al, 2021b ; Bai et al, 2021d ; Xue et al, 2021a ; Xue et al, 2021b ; Wang et al, 2021 ; Chen et al, 2022 ). Lead (Pb) and copper (Cu), that are featured with characters of toxicity, non-biodegradability, and bioaccumulation, are considered two common and dangerous heavy metal contaminants present in surrounding environments, which cause serious threats to plant and human health ( Zhao et al, 2016 ; Jiang et al, 2019 ; Liao et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of Bacterial Culture and Calcium Source Addition on Lead and Copper Remediation Using Bioinspired Calcium Carbonate Precipitation

Xue

Cheng

Wang

et al. 2022

Front. Bioeng. Biotechnol.

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Lead and copper ions from wastewater induced by metallurgical processes are accumulated in soils, threatening plant and human health. The bioinspired calcium carbonate precipitation is proven effective in improving the cementation between soil particles. However, studies on capsulizing heavy metal ions using the bioinspired calcium carbonate precipitation are remarkably limited. The present study conducted a series of test tube experiments to investigate the effects of bacterial culture and calcium source addition on the remediation efficiency against lead and copper ions. The calcium carbonate precipitation was reproduced using the Visual MINTEQ software package to reveal the mechanism affecting the remediation efficiency. The degradation in the remediation efficiency against lead ions relies mainly upon the degree of urea hydrolysis. However, higher degrees of urea hydrolysis cause remediation efficiency against copper ions to reduce to zero. Such high degree of urea hydrolysis turns pH surrounding conditions into highly alkaline environments. Therefore, pursuing higher degrees of urea hydrolysis might not be the most crucial factor while remedying copper ions. The findings shed light on the importance of modifying pH surrounding conditions in capsulizing copper ions using the bioinspired calcium carbonate precipitation.

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“…Moreover, loess is extremely important and covers 630,000 km 2 in China. Clay minerals in loess have complex chemical composition, high specific surface areas, and high negative charge (Xue et al, 2021a(Xue et al, , 2021bDuan et al, 2021;Bai B. et al, 2021Bai B. et al, , 2021b. The forming of water during the EK remediation process can cause the swelling and dispersion of clays in loess toward increasing the thickness of the electric double layer and causing a reduction in the suction (Hu et al, 2021a;Hu et al, 2022a;Wang et al, 2022a).…”

Section: Introductionmentioning

confidence: 99%

Revealing underlying mechanisms affecting electrokinetic remediation of an artificially Cu- and Pb-contaminated loess using the external regulatory system with adsorbent

Cheng

Wen

et al. 2022

Front. Mater.

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Considering extensive metallurgical mining activities in the northwest of China, handling Cu- and Pb-rich wastewater is a challenging task. Inappropriate handling of the Cu- and Pb-rich wastewater can lead to accumulation of Cu and Pb in the surrounding environment, thereby posing a serious threat to human health. Electrokinetic (EK) technology is an increasingly popular alternative to traditional approaches for contaminated soil remediation owing to its high effectiveness and low risk of secondary pollution. This study first proposed an external regulatory system with the adsorbent (ERSA) and investigated the effect of electrode type, ERSA, and cation exchange membrane (CEM) on the EK remediation of an artificially Cu- and Pb-contaminated loess. An EK reactor incorporating ERSA was applied to the EK experiments to circulate the electrolyte, not only making pH surrounding the cathode lower, but also preventing the formation of precipitation. The electrokinetic geosynthetics electrode released H+ and OH− faster and promoted their migration toward the specimen. However, because of the faster precipitation near the cathode, the boost in the remediation efficiency was hindered. Furthermore, considering the ERSA use, a decrease in soil pH near the cathode reduced the precipitation, thereby enhancing the EK remediation efficiency. In contrast, the use of CEM lowered the soil pH, increased the soil electrical conductivity (EC) and electric current, and aggravated the electroosmotic flow. The Cu remediation efficiency using the modified EK reactor was largely lifted to 85.52%, while the Pb remediation efficiency increased to 75.51%. These results shed light on an enhancement on the EK remediation efficiency and the potential of applying the modified EK reactor to remedy Cu- and Pb-rich water bodies.

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Effect of straw reinforcement on the shearing and creep behaviours of Quaternary loess

Cited by 8 publications

References 58 publications

Creep characteristics of corn straw particles simulated based on Burgers model

Creep characteristics of corn straw particles simulated based on Burgers model

Effects of Bacterial Culture and Calcium Source Addition on Lead and Copper Remediation Using Bioinspired Calcium Carbonate Precipitation

Revealing underlying mechanisms affecting electrokinetic remediation of an artificially Cu- and Pb-contaminated loess using the external regulatory system with adsorbent

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