| 陕北林草混交根土复合体抗剪强度研究 |
| 王月1,2,4; 杜峰1,2,3,4; 周敏1,2,4; 张馨月1,2,4; 张贇贇1,2,4
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| 2018
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发表期刊 | 水土保持研究
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卷号 | 25期号:2页码:213-219 |
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 0.75mm 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。 |
其他摘要 | 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 systemat -
ically 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 0.75mm ,
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 in -
crease 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 stabili -
ty
, and this research may have important theoretical implications for future study of exploring high stable
slope protection technology of forest - grass integration. |
关键词 | 林草混合根系
慢剪
根长密度
根面积密度
抗剪强度
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收录类别 | 中文核心期刊要目总览
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语种 | 中文
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文献类型 | 期刊论文
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条目标识符 | sbir.nwafu.edu.cn/handle/361005/10341
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专题 | 水保所知识产出(1956---)
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作者单位 | 1.西北农林科技大学 林学院 2.中国科学院 水利部 水土保持研究所 3.中国科学院 水利部 水土保持研究所 黄土高原土壤侵蚀与 干旱农业国家重点实验室 4.西北农林科技大学 水土保持研究所
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推荐引用方式 GB/T 7714 |
王月,杜峰,周敏,等. 陕北林草混交根土复合体抗剪强度研究[J]. 水土保持研究,2018,25(2):213-219.
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APA |
王月,杜峰,周敏,张馨月,&张贇贇.(2018).陕北林草混交根土复合体抗剪强度研究.水土保持研究,25(2),213-219.
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MLA |
王月,et al."陕北林草混交根土复合体抗剪强度研究".水土保持研究 25.2(2018):213-219.
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文件名:
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陕北林草混交根土复合体抗剪强度研究_王月.pdf
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格式:
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Adobe PDF
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