草本植物根系对土体的加筋作用

doi:10.11988/ckyyb.20231043

raybet体育在线院报 ›› 2025, Vol. 42 ›› Issue (2): 100-106.DOI: 10.11988/ckyyb.20231043

草本植物根系对土体的加筋作用

王海涛¹(), 张宇¹, 刘琳琳¹, 崔明华², 沈向军³

¹ 大连交通大学土木工程学院,辽宁大连 116028
² 黑龙江工商学院铁道学院,哈尔滨 150025
³ 大连环复生态技术有限公司,辽宁大连 116023

收稿日期:2023-09-25 修回日期:2023-12-22 出版日期:2025-02-01 发布日期:2025-02-01
作者简介:
王海涛(1982-),男,湖北随州人,教授,博士,主要从事环境岩土工程研究。E-mail: whtdjtu@163.com
基金资助:
辽宁省教育厅基本科研项目(JYTMS20230006); 辽宁省自然科学基金计划项目(2020-MS-271)

Reinforcement Effect of Herb Root System on Soil

WANG Hai-tao¹(), ZHANG Yu¹, LIU Lin-lin¹, CUI Ming-hua², SHEN Xiang-jun³

¹ School of Civil Engineering, Dalian Jiaotong University, Dalian 116028, China
² Railway Institute,Heilongjiang College of Business and Technology, Harbin 150025, China
³ Dalian Regreen EcologicalTechnology Co., Ltd., Dalian 116023, China

Received:2023-09-25 Revised:2023-12-22 Published:2025-02-01 Online:2025-02-01

摘要/Abstract

摘要：

为研究根土相互作用,量化草本植物根系对土体抗剪强度的增强作用,以Wu和Waldron提出的根系固土模型为基础,考虑根系分布剪切方向、锚固作用长度和有效根数量3个因素,提出了改进模型,对草本植物加筋模型进行改进优化,并利用该模型研究根系与剪切面初始夹角、根系直径等对固土能力的影响。结果表明:改进模型能够很好地拟合试验结果;随着根系与剪切面夹角的增大,逆斜交根系对土体的加筋贡献值先增大后减小,顺斜交根系对土体的加筋贡献值先为0后增大最后减小;随着根系直径的增大,不同分布角度的根系对土体的加筋贡献值均增大,且大致呈正比例关系。

关键词: 草本植物, 生态护坡, 根土复合体, 加筋作用, 固土模型

Abstract:

To investigate root-soil interaction and quantify the enhancement of soil shear strength by herb roots, an improved root-soil reinforcement model based on Wu and Waldron’s model was proposed by integrating three key factors: root distribution shear direction, anchorage length, and effective root number. The enhanced model was employed to examine the impact of the initial angle between the root and the shear surface, as well as root diameter, on soil reinforcement capacity. Results indicate that the improved model accurately fits the experimental data. Specifically, with the increase of the angle between root and shear plane, the reinforcement contribution of inversely oblique roots increases first and then decreases, while that of forward oblique roots increases first from zero and then decreases. Furthermore, with the increase of root diameter, the contribution of roots with varying distribution angles to soil reinforcement increases, roughly exhibiting a proportional relationship.

Key words: herbs, ecological slope protection, root-soil composite, reinforcement effect, soil reinforcement model

王海涛, 张宇, 刘琳琳, 崔明华, 沈向军. 草本植物根系对土体的加筋作用[J]. raybet体育在线院报, 2025, 42(2): 100-106.

WANG Hai-tao, ZHANG Yu, LIU Lin-lin, CUI Ming-hua, SHEN Xiang-jun. Reinforcement Effect of Herb Root System on Soil[J]. Journal of Changjiang River Scientific Research Institute, 2025, 42(2): 100-106.

图/表 8

图1 根分布及剪切方向

Fig.1 Root distribution and shear direction

图2 W & W改进模型

Fig.2 Improved W & W’s model

图3 试验结果与模型计算结果

Fig.3 Curves of test results and model calculation results

表1 试样中黑麦草根系统计结果

Table 1 Statistical results of ryegrass roots in samples

直径/mm	根数	与水平面夹角/(°)	直径/mm	根数	与水平面夹角/(°)
0.15~0.20	1	顺35	0.60~0.65	4	顺49、顺66、 90、逆44
0.20~0.25	1	逆46	0.65~0.70	1	逆67
0.25~0.30	1	顺58	0.70~0.75	2	顺82、逆59
0.30~0.35	1	顺84	0.75~0.80	1	逆58
0.35~0.40	2	顺32、逆53	0.80~0.85	1	顺76
0.40~0.45	2	顺64、逆71	0.85~0.90	1	逆73
0.45~0.50	2	顺52、顺65	0.90~0.95	1	90
0.50~0.55	2	顺48、顺56	0.95~0.10	1	逆78
0.55~0.60	2	顺74、逆53

图4 d=0.6 mm时单根初始角度对土体的加筋贡献

Fig.4 Contribution of the initial angle of a single root to soil reinforcement (d=0.6 mm)

图5 d=0.6 mm时单根拉应力和剪切位移关系

Fig.5 Relationship between tensile stress and shear displacement of a single root (d=0.6 mm)

图6 根系直径对土体的加筋贡献

Fig.6 Contribution of roots diameter to soil reinforcement

图7 根系拉应力和剪切位移关系

Fig.7 Relationship between root tensile stress and shear displacement

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草本植物根系对土体的加筋作用

Reinforcement Effect of Herb Root System on Soil

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