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Subject: search.filters.subject.Soil water retention

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    Influence of soil density on gas permeability and water retention in soils amended with in-house produced biochar
    (2021-06-01)
    Garg, Ankit
    ;
    Huang, He
    ;
    Cai, Weiling
    ;
    Reddy, Narala Gangadhara
    ;
    Chen, Peinan
    Biochar has been used as an environment-friendly enhancer to improve the hydraulic properties (e.g. suction and water retention) of soil. However, variations in densities alter the properties of the soil–biochar mix. Such density variations are observed in agriculture (loosely compacted) and engineering (densely compacted) applications. The influence of biochar amendment on gas permeability of soil has been barely investigated, especially for soil with different densities. The major objective of this study is to investigate the water retention capacity, and gas permeability of biochar-amended soil (BAS) with different biochar contents under varying degree of compaction (DOC) conditions. In-house produced novel biochar was mixed with the soil at different amendment rates (i.e. biochar contents of 0%, 5% and 10%). All BAS samples were compacted at three DOCs (65%, 80% and 95%) in polyvinyl chloride (PVC) tubes. Each soil column was subjected to drying–wetting cycles, during which soil suction, water content, and gas permeability were measured. A simplified theoretical framework for estimating the void ratio of BAS was proposed. The experimental results reveal that the addition of biochar significantly decreased gas permeability k<inf>g</inf> as compared with that of bare soil (BS). However, the addition of 5% biochar is found to be optimum in decreasing k<inf>g</inf> with an increase of DOC (i.e. k<inf>g,65%</inf> > k<inf>g,80%</inf> > k<inf>g,95%</inf>) at a relatively low suction range (< 200 kPa) because both biochar and compaction treatment reduce the connected pores.
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    Influence of physical and biochemical composition of three cellulose fibers on cracking of soil
    (2019-01-01)
    Boddu, Rishita
    ;
    Hong, Min
    ;
    Yongkang, Deng
    ;
    Fengjiao, Chen
    ;
    Garg, Ankit
    Different soil improvement techniques have been used to intensify the engineering properties of soil. Three different lignocellulose fiber-reinforced (jute, coir and water hyacinth (WH)) have been explored on the desiccation potential of compacted clayey silt coil. The experimental methodology involved the mixing of fibers with soil at requisite amount and subjecting them to natural environment with controlled irrigating. The controlled irrigation comprised of 15 wetting/drying cycles for 105 days. Parameters like matric suction and water content were focused upon and recorded along with the surface crack formation. The data obtained from the field experiments were analyzed using the Artificial Neural Network (ANN) approach, which is developed in house using C++ language. From the analysis, it can be comprehended that coir is more effective as a reinforcement due to its multifilament nature and higher lignin content which is suitable in resisting crack formation. Further, optimization analysis and sensitivity analysis suggested mechanism of cracking for each fiber.