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冷-解周期对根土复合材料的剪切强度的影响
Qi Liu1,2,3, Jiankun Huang1,2,3, Zhiwei Zhang1,2,3
1Key Laboratory of State Forestry Administration on Soil and Water Conservation, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China.
Materials (Basel, Switzerland)
|January 23, 2024
概括
植物根可以提高高山地区的土壤稳定性,减少结解周期对剪切强度的影响. 这项研究为永久区的工程和防灾提供了洞察力.
科学领域:
- 地质技术工程 地质技术工程
- 土壤科学 土壤科学
- 永久土科学 永久土科学
背景情况:
- 季节性永久区的阿尔卑斯山草原容易受到土壤退化的影响,原因是极端气候和冰解周期.
- 这些地区频繁发生的灾难与土壤剪切强度的降低有关,这是植物根源复杂化的问题.
- 在融条件下了解根土相互作用对于工程和防灾至关重要.
研究的目的:
- 研究结解周期对根土复合材料的剪切强度的影响.
- 为了比较根土复合材料在不同融周期和水分含量下与裸土的剪切强度行为.
- 开发和验证数值模型,用于预测结融化环境中的土壤剪切强度.
主要方法:
- 直接剪切测试是在裸露的土壤和根土复合材料上进行的,这些复合材料经过了结解周期.
- 最初的水分含量有所变化,以评估其对剪切强度的影响.
- 实验数据被用来推导数值模拟的匹配方程.
主要成果:
- 根土复合材料与裸土相比,对结冰解周期的稳定性更强,特别是在早期阶段.
- 对于两种土壤类型,土壤剪切强度在3-5个结解周期后稳定.
- 结解周期主要影响土壤凝聚力,导致剪切强度的变化,根的存在减轻了这种影响.
结论:
- 植物根在阿尔卑斯山永久区显著提高土壤对融退化的抵抗力.
- 开发的拟合方程为在融条件下对土壤行为进行数值模拟提供了一个可行的方法.
- 这些发现对寒冷地区的基础设施发展和灾害风险管理有实际影响.
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