Influence of water and salt on suction characteristics of unsaturated clay: variation, mechanism, and fitting

Chen, Huie; Li, Jinfeng; Yuan, Xiaoyan; Shi, Bin; Shan, Wenchong

doi:10.1007/s10064-021-02435-8

Cited by 7 publications

(1 citation statement)

References 64 publications

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“…Moreover, ammonium ions produced by urea hydrolysis and various organisms such as the extracellular polymeric substances (EPS) produced by microbes, bacteria, urea, and enzymes were also deposited in the pores of the soil (He et al., 2018; Tang et al., 2020). These soluble salts and organisms in soil significantly increased the soil osmotic suction and improved the soil water retention capacity (Chen et al., 2021; Saffari et al., 2019). Consequently, the soluble salts in soil had a positive effect on the inhibition of soil evaporation process.…”

Section: Discussionmentioning

confidence: 99%

Long‐Term Performance on Drought Mitigation of Soil Slope Through Bio‐Approach of MICP: Evidence and Insight from Both Field and Laboratory Tests

Ji,

Tang,

Pan

et al. 2024

Water Resources Research

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Drought is a serious global environmental issue that causes water resource scarcity and threatens agriculture and food supplements. This study aims to investigate the long‐term performance of an eco‐friendly technique‐microbial induced carbonate precipitation (MICP) on drought mitigation at field and laboratory scales. Seven in‐situ slopes treated with different MICP rounds and cementation solution concentrations were subjected to 16‐month weathering. Tests were conducted to evaluate the evaporation characteristics, water retention capacity, and CaCO3 distribution. Laboratory soil samples were further prepared to provide evidence related to underlying weathering mechanisms. The results show that MICP has a time‐dependent performance on drought mitigation. After MICP treatment, soil performs a remarkable evaporation suppression ability and the evaporation rate can decrease by 50%. This is attributed to the soluble salts which increase soil water retention capability and dense hard crust which inhibits water vapor migration into the atmosphere. However, the soluble salts and crust are sensitive to weathering thus leading to degradation of MICP. Suffering 16‐month weathering, the MICP‐induced CaCO3 decreases by more than 60%. The evaporation rate of soil increases with MICP rounds and cementation solution concentrations and can reach nearly two times of untreated soil. MICP‐treated field soil exhibits weaker water retention capacity than untreated soil because MICP alters soil microstructure which expands macropores and decreases volume of micropores. Connected macropores act as favorable evaporation channels and accelerate evaporation. To ensure MICP long‐term effects, periodical treatments are necessary. The most effective MICP treatment scheme is four to six treatment rounds and 1.0 M cementation solution.

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Section: Discussionmentioning

confidence: 99%

Long‐Term Performance on Drought Mitigation of Soil Slope Through Bio‐Approach of MICP: Evidence and Insight from Both Field and Laboratory Tests

Ji,

Tang,

Pan

et al. 2024

Water Resources Research

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A framework for estimating the matric suction in unsaturated soils using multiple artificial intelligence techniques

Wang,

Vanapalli

2024

Num Anal Meth Geomechanics

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Implementation of the state‐of‐the‐art understanding of the mechanics of unsaturated soils into geotechnical engineering practice is partly limited due to the lack of quick, reliable, and economical techniques for matric suction measurement. Matric suction is one of the key stress state variables that significantly influences the hydro‐mechanical behavior of unsaturated soils. In this paper, to address this objective, two artificial intelligence (AI) models were developed for estimating matric suction in unsaturated soils based on the particle swarm optimization support vector regression (PSO‐SVR) and multivariate adaptive regression spline (MARS) algorithms. The results suggest that both these models can reasonably estimate matric suction. Compared to the MARS model, the PSO‐SVR model can achieve higher accuracy. Nonetheless, the MARS model facilitates the sensitivity analysis and the selection of essential inputs. A novel integrated framework is proposed and validated, leveraging the strengths, and alleviating the limitations of the PSO‐SVR and MARS algorithms for reliable and rapid estimation of matric suction in the range of 0–1500 kPa for low plastic soils (0 < Ip ≤ 7). Six inputs are required to use this model successfully; some can be measured using conventional laboratory tests, and others can be calculated from mass‐volume relationships.

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Density and salinity effects on the water retention capacity of unsaturated clayey dispersive soil

et al. 2023

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Influence of water and salt on suction characteristics of unsaturated clay: variation, mechanism, and fitting

Cited by 7 publications

References 64 publications

Long‐Term Performance on Drought Mitigation of Soil Slope Through Bio‐Approach of MICP: Evidence and Insight from Both Field and Laboratory Tests

Long‐Term Performance on Drought Mitigation of Soil Slope Through Bio‐Approach of MICP: Evidence and Insight from Both Field and Laboratory Tests

A framework for estimating the matric suction in unsaturated soils using multiple artificial intelligence techniques

Density and salinity effects on the water retention capacity of unsaturated clayey dispersive soil

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