ANN Model Development for Air Permeability in Biochar Amended Unsaturated Soil

Cai, Weiling; Kumar, Himanshu; Huang, Shan; Bordoloi, Sanandam; Garg, Ankit; Lin, Peng; Gopal, Phani

doi:10.1007/s10706-019-01091-w

Cited by 19 publications

(4 citation statements)

References 44 publications

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“…The presence of vegetation has a similar effect, causing a high air‐entry value due to a decrease in soil void ratio (Leung et al., 2015; Ng, Ni, Leung, & Wang, 2016). Mesoporous and hydrophilic groups of biochar play a vital role in water holding (Cai et al., 2020). The mesopores strengthen capillary action, similar to how roots occupy soil pores (Ni et al., 2018; Scanlan & Hinz.…”

Section: Resultsmentioning

confidence: 99%

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Influence of grass root density on gas permeability and water retention in water hyacinth‐based biochar amended soil

Chen

Zhang

Huang

et al. 2023

Environmental Quality Mgmt

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The present study focuses on the effect of root density on gas permeability and water retention in biochar‐amended soil used as a cover material in landfills. Biochar amendment of soil is important measurement in landfill cover, while vegetation is an important for ecological restoration. Despite its importance, little attention has been given to the adaptation of vegetated biochar‐amended soil in landfill cover. The interactions between the biochar, vegetation, and soil concerning the gas permeability remain unknown, which may lead to unexpectedly increased waste gas emissions in landfill covers. To enhance the utilization efficiency of biochar amendment and vegetation techniques in landfill covers, further investigation of their coupled effects on gas permeability and water retention is necessary. Four different treatments were applied to manufacture series of soil columns: bare soil (BS), biochar‐soil composite (BSC), vegetated biochar‐soil composite with low planting density (VBSCL) and high planting density (VBSCH). The soil water characteristic curve and gas permeability were observed under natural wetting and drying cycles. The results showed that VBSCL increased gas permeability by 142% as compared to BSC. VBSCH enhanced gas permeability by 168% as compared to BSC. This was due to the spreading and decaying root systems forming preferential pathways for gas transfer. Additionally, VBSCL and VBSCH made around a 10% increase in volume water content at the whole suction range, while BSC just enhanced around 20% water content at the low suction range (less than 10 kPa). The combination of roots and biochar have significantly enhanced water retention during entire suction range due to capillarity.

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Section: Resultsmentioning

confidence: 99%

“…2010). The hydrophilic surface bond in biochar also contributes to holding more water (Cai et al., 2020). The potential of using vetiver grass and water hyacinth biochar for water retention can be seen in Exhibits 6 and 7.…”

Section: Resultsmentioning

confidence: 99%

Influence of grass root density on gas permeability and water retention in water hyacinth‐based biochar amended soil

Chen

Zhang

Huang

et al. 2023

Environmental Quality Mgmt

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“…It can be observed from Figure 3(b) to (d) that the physical appearance of both biochars is different from the soil. Variation in surface texture, morphology, and size can affect the mechanical and hydraulic properties of BAS (Batista et al., 2018; Cai et al., 2020). Figure 3(b) also shows that soil particles are smaller in size than WB and PMB.…”

Section: Resultsmentioning

confidence: 99%

Influence of feedstock type and particle size on efficiency of biochar in improving tensile crack resistance and shear strength in lean clayey soil

Kumar

Huang

Mei

et al. 2021

International Journal of Damage Mechanics

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The development of tensile stress can cause desiccation cracks, further increasing infiltration and inducing instability in green infrastructure (slopes and landfill liners). Recent research has promoted the use of biochar (i.e., stable carbon with a life period of more than 500 years) as an eco-friendly material that can provide simultaneous benefits in reducing tensile stresses and crack development, aiming to enhance landfill cover longevity. However, there is a lack of guidelines and criteria for selecting biochar (feedstock type and particle size) as landfill cover material. This study aims to investigate the effects of biochar particle size and feedstock type on cracking of soil. Two contrasting feedstock types (i.e., pig manure-based and wood-based) have been selected for amendment on lean clay soil. Laboratory experiments were conducted to monitor the cracks. The results show that wood biochar (WB) is more efficient in crack reduction than pig manure biochar (PMB). Moreover, it has been observed that fine-grained biochar is more suspectable to cracks formation regardless of biochar type. The cohesion and internal friction angle of biochar are dependent on the surface morphology of biochar. WB has more angularity and sharp edges, which can increase interlocking in soil, thereby enhancing shear resistance and, hence, soil stability. The comprehensive study can help narrow down the selectivity of biochar and its specifications to mitigate cracks and enhance the strength of landfill cover.

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“…In the optimization process, we used the simplex algorithm, the most common and simplest optimization algorithm, to find the maximum value to consider extreme cases. Simplex search is a gradient-free optimization algorithm for minimizing or maximizing any function in a limited number of iterations [25]. A total of 450 iterations were performed for this test optimization analysis.…”

Section: Parameter Setting For Optimization Analysis and Sensitivity ...mentioning

confidence: 99%

Application of ANN in Construction: Comprehensive Study on Identifying Optimal Modifier and Dosage for Stabilizing Marine Clay of Qingdao Coastal Region of China

Bo,

Liu,

Shang

et al. 2024

JMSE

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Nowadays, the use of new compound chemical stabilizers to treat marine clay has gained significant attention. However, the complex non-linear relationship between the influencing factors and the unconfined compressive strength of chemically treated marine clay is not clear. In order to study the influence of various factors (dosage, type of stabilizer, curing age) on the unconfined compressive strength of solidified soil during chemical treatment, experiments were performed to determine the unconfined compressive strength of soft marine clay modified with various types of stabilizers. Further, an artificial neural network (ANN) model was used to establish a prediction model based on the unconfined compressive strength test data and to verify the performance. Sensitivity and optimization analyses were further conducted to explore the relative significance of parameters as well as the optimal dosage amount. Research has found that when the content of aluminate cement is 89.5% and the content of curing agent is 30%, the unconfined compressive strength significantly increases after 28 days of solidification, and the change in quicklime content has the greatest effect on the improvement in the unconfined compressive strength. The influence of modifiers on the unconfined compressive strength is in the order: potassium hydroxide > kingsilica > quick lime > bassanite. The values of each factor were obtained when the unconfined compressive strength was the maximum, which provided support for the optimization of the treatment scheme. The analysis of chemical treatment is no longer limited to the linear relationship according to the test results, which proves the feasibility of non-linear relationship analysis based on the artificial neural network.

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ANN Model Development for Air Permeability in Biochar Amended Unsaturated Soil

Cited by 19 publications

References 44 publications

Influence of grass root density on gas permeability and water retention in water hyacinth‐based biochar amended soil

Influence of grass root density on gas permeability and water retention in water hyacinth‐based biochar amended soil

Influence of feedstock type and particle size on efficiency of biochar in improving tensile crack resistance and shear strength in lean clayey soil

Application of ANN in Construction: Comprehensive Study on Identifying Optimal Modifier and Dosage for Stabilizing Marine Clay of Qingdao Coastal Region of China

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