植物根系分布形态及含根复合土强度特性试验

doi:10.16285/j.rsm.2018.1338

岩土力学 ›› 2019, Vol. 40 ›› Issue (10): 3717-3723.doi: 10.16285/j.rsm.2018.1338

植物根系分布形态及含根复合土强度特性试验

孔纲强¹，文磊¹，刘汉龙²，王成青¹

1. 河海大学岩土力学与堤坝工程教育部重点实验室，江苏南京 210098；2. 重庆大学山地城镇建设与新技术教育部重点实验室，重庆 400450）

收稿日期:2018-07-23 出版日期:2019-10-11 发布日期:2019-10-19
作者简介:孔纲强，男，1982年生，博士，教授，博士生导师，主要从事能源地下结构、透明土试验技术方面的教学与科研工作。
基金资助:
国家自然科学基金项目(No. 51478165)

Strength properties of root compound soil and morphological observation of plant root

KONG Gang-qiang¹, WEN Lei¹, LIU Han-long², WANG Cheng-qing¹

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400450, China

Received:2018-07-23 Online:2019-10-11 Published:2019-10-19
Supported by:
This work was supported by the National Natural Science Foundation of China (51478165).

摘要/Abstract

摘要： 根系空间分布形态对含根复合土体抗剪强度影响显著。近年来快速发展的透明土试验技术为非嵌入式可视化观测植物根系分布形态提供了技术支撑。基于Carbopol Ultrez 10制配成透明黏土材料，开展高羊茅、香根草两种植物根系生长过程中的分布形态观测研究；并与植物在天然砂土与天然黏土中的根系生长长度进行对比分析。继而，开展高羊茅植物根系分别在水平、竖直、倾斜、相交及混合等分布形态下含根复合土体的十字板剪切试验，探讨最优含根量、根系增强效应系数以及表层加筋效应等问题。试验结果表明，透明黏土材料中最优含根量约为0.35%，混合分布形态下根系增强效应最明显，根系增强效应系数约为1.4～1.5。

关键词: 植被, 透明黏土, 含根复合土, 十字板剪切试验

Abstract: The spatial distribution of the root system has a significant effect on the shear strength of the composite soil. In recent years, the rapid development of the transparent soil test technology provides suitable technical support for visual observation of plant root distribution. Based on the transparent clay manufactured by Carbopol Ultrez 10, the distribution patterns of two plant root systems (tall fescue and vetiver) were visually observed in the growing processes. The growth of rhizomes in natural sand and natural clay was also carried out for comparative analysis. Based on the vane shear test method, the strengths of tall fescue root reinforced composite soil with different spatial distributions (such as vertical, inclined, intersect and mixed) were measured in detail. The optimum root content, root enhancement effect coefficient, and surface reinforcement effect were also discussed. The results show that the optimal root content in the transparent clay material is about 0.35%, and the root enhancement effect coefficient of the mixed root system is the largest, about 1.4-1.5 under this experimental condition.

Key words: vegetation, transparent clay, root compound soil, vane shear test

中图分类号:

TU 47

孔纲强, 文磊, 刘汉龙, 王成青, . 植物根系分布形态及含根复合土强度特性试验[J]. 岩土力学, 2019, 40(10): 3717-3723.

KONG Gang-qiang, WEN Lei, LIU Han-long, WANG Cheng-qing, . Strength properties of root compound soil and morphological observation of plant root[J]. Rock and Soil Mechanics, 2019, 40(10): 3717-3723.

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植物根系分布形态及含根复合土强度特性试验

Strength properties of root compound soil and morphological observation of plant root

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