WANG Yue,DU Feng,ZHOU Min,et al.Research on Shear Strength of Root-Soil Composite in a Forest and Grass Standing Site in Northern Shaanxi[J].Research of Soil and Water Conservation,2018,25(02):213-219.
陕北林草混交根土复合体抗剪强度研究
- Title:
- Research on Shear Strength of Root-Soil Composite in a Forest and Grass Standing Site in Northern Shaanxi
- Keywords:
- roots of mixed forest and grass; slow shear tests; root length density; root surface density; shear strength
- 分类号:
- S157.1
- 摘要:
- 为进一步探讨林草混合根系的护坡力学效应，选取陕北乡土植物小叶杨和白羊草为试验目标，分别进行室内单根拉伸试验以及原状林草混合根土复合体的慢剪试验，较为系统地分析了小叶杨和白羊草根系的抗拉强度特征和根土复合体的抗剪强度特征。结果表明：小叶杨和白羊草的单根抗拉力与根径之间呈近似幂函数的正相关关系，而两者单根抗拉强度与根径之间均表现为近似负相关的对数关系，且在根径小于0.75 mm时白羊草的单根抗拉强度远大于相同根径的小叶杨；随着根长密度、根表面积密度的增大，土壤内摩擦角φ随之均呈对数增长，而土壤粘聚力c则均呈直线增长趋势。说明林草混合根系的加入可以有效提高土体的抗剪强度，且有助于增强边坡稳定性，同时为林草一体化的护坡技术提供理论依据。
- Abstract:
- To further explore the mechanical effects of the soil reinforced by mixed forest and grass in slope protection in Northern Shaanxi, annual plants of Populus simonii Car. and Bothriochloa ischaemum (L.) Keng were selected as the samples. The single tensile tests and slow shear tests were carried out to systematically analyze the single root tensile resistances of Populus simonii Car. and Bothriochloa ischaemum (L.) Keng, and the strength characteristics of root-soil composites of forest and grass. The results indicate that the single root tensile resistances increase with the increase of diameter, and power relations exist between diameter and tensile resistance of the roots of forest and grass, respectively; meanwhile, tensile strength and the diameter of the single root of the forest and grass showed the negative logarithm relations, respectively; especially, when root diameters were less than 0.75 mm, the single root tensile strength of Bothriochloa ischaemum (L.) Keng was much greater than that of Populus simonii Car. under the condition of same root diameter. The internal friction angle φ was logarithmic growth and cohesion c was linear growth with the increase of root length density and root surface area density. These results also show that roots of mixed forest and grass can improve the shear strength in the loess slope in Northern Shaanxi and enhance the slope stability, and this research may have important theoretical implications for future study of exploring high stable slope protection technology of forest-grass integration.
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备注/Memo
收稿日期:2017-4-12;改回日期:2017-5-10。
基金项目:国家重点研发计划项目（2017YFC0504504）；国家自然科学基金（41771322）
作者简介:王月(1990-),女,山东章丘人,硕士研究生,研究方向为水土保持。E-mail:yuewang@nwafu.edu.cn
通讯作者:杜峰(1971-),男,内蒙古乌兰察布人,博士,副研究员,主要从事群落、种群生态及植被恢复生态研究。E-mail:dufeng@ms.iswc.ac.cn