根分布模式对弹性变形阻力能力和根强化土壤中孔水发展的影响
Shumin Lyu1,2, Jun Li3,4, Xiaodong Ji1,2
1Department of Civil Engineering, Beijing Forestry University, Beijing, 100083, People's Republic of China.
Scientific reports
|February 15, 2025
概括
根分布显著提高了在交通负荷下土壤的稳定性. 特定的根型 (75%水平,25%垂直) 可以最大限度地减少变形和孔隙水压,增强斜坡稳定性并防止侵蚀.
科学领域:
- 地质技术工程 地质技术工程
- 生态工程生态工程生态工程
- 土壤力学 土壤力学
背景情况:
- 浅浅的土壤易受车辆负载,降水和地下水造成的变形和孔水压力积累的影响.
- 路边斜坡面临长期周期性交通负载,增加侵蚀和山体滑坡的风险.
- 生态工程措施,特别是根部强化,在缓解这些问题方面表现有前途.
研究的目的:
- 研究根分布模式如何影响根强化土壤中的弹性变形和孔水压.
- 通过使用动态三轴测试,模拟循环交通负荷对根强化土壤的影响.
- 增强现有的孔水压力模型,用于根强化土壤.
主要方法:
- 进行了动态三轴测试,以模拟根强化土壤样本的循环交通负载.
- 分析了不同的根分布模式,重点关注垂直根与水平根的比率.
- 引入了一个新的参数D,以改进孔水压力模型.
主要成果:
- 根的存在大大增加了土壤对变形的抵抗力.
- 75%的水平根和25%的垂直根的根分布导致了最小的土壤变形和较慢的孔水压发展.
- 增强的孔水压模型显示,根强化土壤的确定系数得到了改善.
结论:
- 根强化显著提高浅土壤的机械性能,提高强度和抗液化能力.
- 优化的根分布模式对于生态工程应用中有效的土壤稳定至关重要.
- 这项研究为通过土壤强化恢复高速公路斜坡的生态恢复提供了有价值的数据.
相关概念视频
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
241
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
241
Residual Stresses in Bending
149
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
149
Pore Size Distribution
82
In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
Adequate...
82
Plastic Behavior
185
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
185
Members Made of Elastoplastic Material
93
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
As the bending moment...
93
Water and Mineral Acquisition
29.5K
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
29.5K


