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The mechanism of the plant roots’ soil-reinforcement based on generalized equivalent confining pressure

BACKGROUND: To quantitatively evaluate the contribution of plant roots to soil shear strength, the generalized equivalent confining pressure (GECP), which is the difference in confining pressure between the reinforced and un-reinforced soil specimens at the same shear strength, was proposed and cons...

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Autores principales: Guo, Ping, Xia, Zhenyao, Liu, Qi, Xiao, Hai, Gao, Feng, Zhang, Lun, Li, Mingyi, Yang, Yueshu, Xu, Wennian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PeerJ Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7531344/
https://www.ncbi.nlm.nih.gov/pubmed/33062447
http://dx.doi.org/10.7717/peerj.10064
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author Guo, Ping
Xia, Zhenyao
Liu, Qi
Xiao, Hai
Gao, Feng
Zhang, Lun
Li, Mingyi
Yang, Yueshu
Xu, Wennian
author_facet Guo, Ping
Xia, Zhenyao
Liu, Qi
Xiao, Hai
Gao, Feng
Zhang, Lun
Li, Mingyi
Yang, Yueshu
Xu, Wennian
author_sort Guo, Ping
collection PubMed
description BACKGROUND: To quantitatively evaluate the contribution of plant roots to soil shear strength, the generalized equivalent confining pressure (GECP), which is the difference in confining pressure between the reinforced and un-reinforced soil specimens at the same shear strength, was proposed and considered in terms of the function of plant roots in soil reinforcement. METHODS: In this paper, silt loam soil was selected as the test soil, and the roots of Indigofera amblyantha were chosen as the reinforcing material. Different drainage conditions (consolidation drained (CD), consolidation undrained (CU), and unconsolidated undrained (UU)) were used to analyse the influences of different root distribution patterns (horizontal root (HR), vertical root (VR), and complex root (CR)) and root contents (0.25%, 0.50%, and 0.75%) on the shear strength of soil-root composites. RESULTS: The cohesion (c) values of the soil-root composites varied under different drainage conditions and root contents, while the internal friction angle (φ ) values remain basically stable under different drainage conditions. Under the same root content and drainage conditions, the shear strength indexes ranked in order of lower to higher were HR, VR and CR. The GECP of the soil-root composites with a 0.75% root content was 1.5–2.0 times that with a 0.50% root content and more than 5 times that with a 0.25% root content under the CD and CU conditions. The GECP in reinforced soil followed the sequence of CD > CU > UU. The GECP of the plant roots increased as confining pressure increased under CD and CU conditions while showed a complex change to the confining pressure under the UU condition. CONCLUSION: It was concluded that the evaluation of plant root reinforcing soil based on GECP can be used to measure effectively the influences of roots on soil under different drainage conditions and root distribution patterns.
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spelling pubmed-75313442020-10-13 The mechanism of the plant roots’ soil-reinforcement based on generalized equivalent confining pressure Guo, Ping Xia, Zhenyao Liu, Qi Xiao, Hai Gao, Feng Zhang, Lun Li, Mingyi Yang, Yueshu Xu, Wennian PeerJ Plant Science BACKGROUND: To quantitatively evaluate the contribution of plant roots to soil shear strength, the generalized equivalent confining pressure (GECP), which is the difference in confining pressure between the reinforced and un-reinforced soil specimens at the same shear strength, was proposed and considered in terms of the function of plant roots in soil reinforcement. METHODS: In this paper, silt loam soil was selected as the test soil, and the roots of Indigofera amblyantha were chosen as the reinforcing material. Different drainage conditions (consolidation drained (CD), consolidation undrained (CU), and unconsolidated undrained (UU)) were used to analyse the influences of different root distribution patterns (horizontal root (HR), vertical root (VR), and complex root (CR)) and root contents (0.25%, 0.50%, and 0.75%) on the shear strength of soil-root composites. RESULTS: The cohesion (c) values of the soil-root composites varied under different drainage conditions and root contents, while the internal friction angle (φ ) values remain basically stable under different drainage conditions. Under the same root content and drainage conditions, the shear strength indexes ranked in order of lower to higher were HR, VR and CR. The GECP of the soil-root composites with a 0.75% root content was 1.5–2.0 times that with a 0.50% root content and more than 5 times that with a 0.25% root content under the CD and CU conditions. The GECP in reinforced soil followed the sequence of CD > CU > UU. The GECP of the plant roots increased as confining pressure increased under CD and CU conditions while showed a complex change to the confining pressure under the UU condition. CONCLUSION: It was concluded that the evaluation of plant root reinforcing soil based on GECP can be used to measure effectively the influences of roots on soil under different drainage conditions and root distribution patterns. PeerJ Inc. 2020-09-29 /pmc/articles/PMC7531344/ /pubmed/33062447 http://dx.doi.org/10.7717/peerj.10064 Text en ©2020 Guo et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
spellingShingle Plant Science
Guo, Ping
Xia, Zhenyao
Liu, Qi
Xiao, Hai
Gao, Feng
Zhang, Lun
Li, Mingyi
Yang, Yueshu
Xu, Wennian
The mechanism of the plant roots’ soil-reinforcement based on generalized equivalent confining pressure
title The mechanism of the plant roots’ soil-reinforcement based on generalized equivalent confining pressure
title_full The mechanism of the plant roots’ soil-reinforcement based on generalized equivalent confining pressure
title_fullStr The mechanism of the plant roots’ soil-reinforcement based on generalized equivalent confining pressure
title_full_unstemmed The mechanism of the plant roots’ soil-reinforcement based on generalized equivalent confining pressure
title_short The mechanism of the plant roots’ soil-reinforcement based on generalized equivalent confining pressure
title_sort mechanism of the plant roots’ soil-reinforcement based on generalized equivalent confining pressure
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7531344/
https://www.ncbi.nlm.nih.gov/pubmed/33062447
http://dx.doi.org/10.7717/peerj.10064
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