[1]程磊,姚磊华,张生旭,等.根系形态对土体强度影响的试验研究[J].自然灾害学报,2018,(01):040-49.[doi:10.13577/j.jnd.2018.0106]
 CHENG Lei,Yao Leihua,ZHANG Shengxu,et al.Experimental study on the root morphology impact on soil strength[J].,2018,(01):040-49.[doi:10.13577/j.jnd.2018.0106]
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根系形态对土体强度影响的试验研究
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
期数:
2018年01期
页码:
040-49
栏目:
出版日期:
2018-02-28

文章信息/Info

Title:
Experimental study on the root morphology impact on soil strength
作者:
程磊1 姚磊华1 张生旭2 郝延周3 宋前进1
1. 中国地质大学(北京)工程技术学院, 北京 100083;
2. 河南农业大学 烟草学院, 河南 郑州 450002;
3. 西安建筑科技大学 土木工程学院, 陕西 西安 710055
Author(s):
CHENG Lei1 Yao Leihua1 ZHANG Shengxu2 HAO Yanzhou3 SONG Qianjin1
1. School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;
2. College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China;
3. Civil Engineering College, Xi’an University of Architecture and Technology, Xi’an 710055, China
关键词:
根系形态狗牙根原状根土重塑根土强度
Keywords:
root morphologyBermuda grassundisturbed Bermuda grass root soilremolded Bermuda grass root soilstrength
分类号:
X9;P64;TU43
DOI:
10.13577/j.jnd.2018.0106
摘要:
为了明确原状与重塑狗牙根根土的强度对应关系,应用激光扫描仪及根系图像分析软件研究狗牙根根系形态,分析根长密度、根系密度、根体积三项根系指标,用室内三轴试验分析原状与重塑狗牙根根土强度特性。结果显示:狗牙根根系多呈交错状分布,部分竖直、倾斜状分布;三项根系指标在0.0~30.0 cm段土体内占总根量的比例依次为93.6%、85.2%、93.8%;狗牙根根系显著提高了原状根土的粘聚力,倾斜状根系分布形态不能稳定体现根系对土体强度的提高,各根系分布形态下土体强度均随围压的增加而增大,对土体强度增长的贡献表现为交错>竖直>倾斜。根系倾斜角度与单位体积内根系形态指标是影响根土复合体强度增长差异的主因,狗牙根根系呈交错、竖直、倾斜分布的重塑根土试样破坏强度依次是原状根土试样破坏强度的0.68~1.11倍、0.56~0.95倍、0.38~0.74倍。
Abstract:
In order to clarify strength relationship of undisturbed and remolded Bermuda grass roots soil (UBGRS and RBGRS), analysis the root length density, root density and root volume three root morphology indexes to study Bermuda grass roots morphology with laser scanner and root morphology image analysis software, and analysis strength characteristic of UBGRS and RBGRS with laboratory tri-axial tests. Results show that the distribution of Bermuda root most appeared on interlocking shape and a part of root put on vertical or inclined distribution. Above three root morphology indexes accounted for the proportion of total root followed by 93.6%,85.2%,93.8%, respectively, in the section of soil mass 0.0~30.0 cm. The cohesion was improved mainly of UBGRS by Bermuda grass roots. The incline root distribution can’t stability reflect root to improve the soil strength. The soil strength increases with confining pressure in every root system distribution, in turn, interlacement>verticality>incliner. The incline angle of the roots and per volume of root morphological indexes are the main reason of the difference in growing of soil-root complex strength. The ratio of failure strength between RBGRS and UBGRS of interlacement, verticality, incliner is 0.68~1.11, 0.56~0.95, 0.38~0.74, respectively.

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备注/Memo

备注/Memo:
收稿日期:2017-01-19;改回日期:2017-07-29。
基金项目:中国地质调查局计划项目(12120114029801)
作者简介:程磊(1985-),男,工程师,博士研究生,主要从事地质灾害研究.E-mail:cheng120090527@163.com
通讯作者:姚磊华(1964-),男,教授,博士,主要从事地质灾害研究.E-mail:yaolh@cugb.edu.cn
更新日期/Last Update: 1900-01-01