Srinil, Chortham
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Item type:Publication, Constitutive model for unsaturated crushable soils(2025-10-01); Kikumoto, MamoruParticle crushing, occurring in crushable materials under high-stress conditions exceeding their crushing strength, leads to particle breakdown and reduction in peak shear strength. The presence of water further diminishes crushing strength. Additionally, particle crushing significantly alters the soil–water characteristic curve (SWCC). The combined effects of particle crushing and the degree of saturation changes induce excessive deformation and weaken the soil. While existing models can predict the behavior of unsaturated soil and particle crushing effects individually, a comprehensive model for unsaturated crushable soils is necessary. This study proposes a constitutive model for unsaturated crushable soils, integrating the effect of the degree of saturation on crushing strength by developing the crushing surface. It incorporates variations in the grading state index and the degree of saturation, affecting soil strength via state boundary surface movement. Validation is achieved through past experimental evidence. The model effectively captures key features of unsaturated crushable soils, including the reduction in crushing strength with increased degree of saturation, the evolution of SWCC due to particle crushing, and additional particle crushing during wetting. Furthermore, a parametric study offers insights into unsaturated crushable soil behavior, highlighting the combined effects of particle crushing and variations in the degree of saturation. When significant particle crushing occurs, increased volumetric compression due to particle crushing leads to a higher degree of saturation and further strength reduction, amplifying soil deformation. Understanding these interactions is crucial for predicting the behavior of unsaturated crushable soils, emphasizing the significance of this study. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Dynamic changes in cellulose content and biomechanical properties of mycorrhizal roots during growth and decay(2023-09-01); ; Aims: Arbuscular mycorrhizal (AM) fungi have been found to increase plant biomass, cellulose content, and the associated root biomechanical properties, but little is known about how AM fungi affect the in situ root decay process in terms of the changes in the chemical and biomechanical properties. Methods: In this study, we inoculated AM fungi to Bermuda grass (Cynodon dactylon L.) and measured the biomass, the contents of cellulose and lignin, and the biomechanical properties, including tensile strength and Young’s modulus of the grass roots as they grew for 180 days and then decayed for 360 days after burning or for 60 days after the herbicide application. Results: Results show that the AM fungi accelerated the accumulation of grass biomass and root cellulose content compared with non-mycorrhizal grass during the growth period. This effect of AM fungi made mycorrhizal grass generally maintained more biomass and cellulose content than non-mycorrhizal grass at every decaying stage. Inoculation of the AM fungi did not significantly change the root tensile strength or Young’s modulus, but it altered the correlations between tensile strength and root diameter, and Young’s modulus and root diameter. Mycorrhizal effects during the root decaying process appeared to diminish under herbicide treatment, compared with normal growth and burning treatments. Conclusion: Our study highlights the important role of AM fungi in maintaining in situ root biomass (a proxy for carbon content) from decaying or decomposing. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Unified state boundary surface model for clay and sand under saturated and unsaturated conditions(2022-10-01);