Simulations of Static Compaction with Soil/Water/Air Coupled F.E. Analysis

Kawai, Katsuyuki; Shibata, Masaki; Ohtsuki, Takeru; Viradeth, Phommachanh; Kanazawa, Susumu; Iizuka, Atsushi

doi:10.1007/978-3-642-31343-1_23

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…In this study, we use the air-dissolved unsaturated soil / water / air coupled finite analysis code "DACSAR-MP" [1] [2]. The unsaturated soil elasticplastic composition model, the water retention curve model, and the finite element formulation in this analysis code are described below.…”

Section: Analysis Methodsmentioning

confidence: 99%

“…In this study, using the coupled soil/water/air finite element analysis program (DACSAR-MP) [1] [2], the mechanical behavior of unsaturated soil due to compaction is considered as a three-layer coupled problem, and the mechanical interpretation of compaction behavior considering the difference of soil materials is analytically investigated. Subsequently, the obtained compacted specimens are subjected to flooding analysis and shear analysis to understand the strength properties from the numerical analysis.…”

Section: Introductionmentioning

confidence: 99%

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Analytical Study of the Strength Characteristics of Compacted Soil

Naito¹

2023

GEOMATE

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In recent years, many cases of river embankments and levees collapsing due to sudden torrential rains and earthquakes have been reported. The mechanism of compaction and collapse based on the mechanics of unsaturated soil is important to establish a quality evaluation method for embankment structures in consideration of performance design. Therefore, in this study, compaction behavior considering soil materials was analyzed using the soil-water-air coupled finite element analysis program (DACSAR-MP). The obtained compacted specimens of silt-mixed sand were then subjected to flooding analysis and constant volume shear analysis to determine the strength properties from the numerical analysis. The results of the analysis showed that over compaction was confirmed by considering air dissolution, and that suction stress had a significant effect on shear strength, resulting in a significant reduction in strength on the wet side. In conclusion, the analysis showed that construction on the dry side is safer and stronger in construction using D values.

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Section: Analysis Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analytical Study of the Strength Characteristics of Compacted Soil

Naito¹

2023

GEOMATE

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“…Compaction is a mechanical process by which mass of soil, consisting of solid loess particles, air and water, is reduced in volume by the application of loads [23][24][25][26][27][28][29][30][31][32].The process of compaction increases the shear strength while decreasing the compressibility and permeability of soil. Compaction quality is largely depending on chemical composition, particle size, water content of soil and compaction method.…”

Section: Introductionmentioning

confidence: 99%

Study on the Compaction Effect Factors of Lime-treated Loess Highway Embankments

Zhang

Wang

2017

CivileJournal

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This paper presents a study to investigate the effects of water content, lime content and compaction energy on the compaction characteristics of lime-treated loess highway embankments. Laboratory compaction tests were conducted to determine the maximum dry density and optimum water content of loess with different lime Contents (0, 3, 5 and 8%), and to examine the effects of water content, lime content and compaction energy on the value of and . In situ compaction tests were performed to obtain the in situ dry density . The value of − achieves it's maximum value when in situ water content − was larger than the value of (+1-2%). The degree of compaction can hardly be achieved to 100% in the field construction of embankments. Higher water content and compaction energy is needed for optimum compaction.

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“…The growth and distribution of roots were largely affected by soil compaction intensities, which enhanced the root resistance and deteriorated the soil physical characteristics (e.g., soil aeration and moisture content)16171819. Moreover, an arrested development of roots had substantial effects on the nutrient uptake and organic composition of crops20212223.…”

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confidence: 99%

Contributions of rational soil tillage to compaction stress in main peanut producing areas of China

Pu¹,

Wu²,

Wang

et al. 2016

Sci Rep

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Tillage intensities largely affect soil compaction dynamics in agro-ecosystems. However, the contribution of tillage intensities on compaction changes in underground peanut (Arachis hypogaea) fields has not been quantified. We thus aimed to better understand the role of soil tillage intensities in mitigation of compaction stress for peanuts. Using three field tillage experiments in major Chinese peanut producing areas, we quantified the effects of (1) no tillage, (2) shallow (20 cm) plowing, (3) deep (30 cm) plowing and (4) deep (30 cm) loosening on changes in soil bulk density at 0–10 cm, 10–20 cm and 20–30 cm depths, roots and pods growth, and nutrient accumulation. Results showed that tillage management effectively mitigated soil compaction stress for peanut growth and production. Greater beneficial improvement for the underground growth of roots and pods, and N accumulation ranked as deep plowing > shallow plowing and deep loosening. Respective increases of 7.5% and 4.6% in root biomass productions and peanut yields were obtained when soil bulk density was decreased by 0.1 g cm−3. Our results suggest that the mitigation of soil compaction stress by deep plowing could be a key tillage strategy for increasing peanut yields in the field.

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Simulations of Static Compaction with Soil/Water/Air Coupled F.E. Analysis

Cited by 3 publications

References 4 publications

Analytical Study of the Strength Characteristics of Compacted Soil

Analytical Study of the Strength Characteristics of Compacted Soil

Study on the Compaction Effect Factors of Lime-treated Loess Highway Embankments

Contributions of rational soil tillage to compaction stress in main peanut producing areas of China

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