The Effect of Roots on the Shear Strength of Texturally Distinct Soils

Maffra, Charles Rodrigo Belmonte; Sousa, Rita dos Santos; Sutili, Fabrício Jaques; Pinheiro, Rinaldo José Barbosa

doi:10.1590/2179-8087.101817

Cited by 22 publications

(22 citation statements)

References 35 publications

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“…Studies have shown that the mean values of root per unit area of soil at shallow layers are lower than 1% [72,73]. is small proportion of roots over the soil block seems to justify why few roots have experienced little change in their particle arrangement, thus subsequently having minor effect on the internal friction angle [67]. e influence of root on internal friction angle was also performed by Graf et al [74].…”

Section: Tensile Force-root Diameter Relationshipmentioning

confidence: 96%

“…According to Veylon et al [71], this could be due to several factors such as type of soil, sample size, and methods of sample preparation. It has also been reported that there is a link between the small amount of roots and insignificant effect on internal friction [67,71].…”

Section: Tensile Force-root Diameter Relationshipmentioning

confidence: 97%

“…e increase in shear strength is due to the presence of roots, which interact with soil that occurred at relatively balanced increases in cohesion values and internal friction angles. However, the cohesion parameter was mostly influenced by the presence of roots [67]. A higher root biomass of root-permeated soil can improve the cohesion and friction values which overall increase the shear strength of the soil.…”

Section: Tensile Force-root Diameter Relationshipmentioning

confidence: 99%

“…e frictional angle values in this present study were smaller than the value for sandy soil (Table 5). Similarly, Maffra et al [67] performed a study on the effect of root on sandy soil shear strength using Phyllanthus sellowianus.…”

Section: Tensile Force-root Diameter Relationshipmentioning

confidence: 99%

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Root Tensile Resistance of Selected Pennisetum Species and Shear Strength of Root-Permeated Soil

Ettbeb

Rahman

Idris

et al. 2020

Applied and Environmental Soil Science

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It is widely recognized that vegetation plays a significant role in contrasting slope instability through the root reinforcement. The main objectives of this paper are to evaluate the root tensile of selected Pennisetum species, namely, P. pedicellatum (PPd) and P. polystachion (PPl), and to determine the soil shear strength of root-permeated soil from these species. The selected species were initially planted in the polybags using the hydroseeding technique. A mineral fertilizer of NPK ratio 10 : 8 : 10 was adopted in the hydroseeding mixture. Routine watering program was applied twice a day throughout growth observation for six months. Four replications were prepared for each species including a set of control polybags, which contained only soil for reference and comparison. The results of root tensile tests revealed the significant relationships between root diameter and tensile force. In comparison, the PPl was still indicated by higher values of root tensile force than PPd. The presence of roots clearly has contributed to the shear stress of root-permeated soils. The root density based on root biomass measurement attributed to the higher value of peak shear stress as achieved by PPl than PPd. The combined effects of root tensile and the soil shear strengths of this selected species can be used as biological materials in slope protection against erosion.

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Section: Tensile Force-root Diameter Relationshipmentioning

confidence: 96%

Section: Tensile Force-root Diameter Relationshipmentioning

confidence: 97%

Section: Tensile Force-root Diameter Relationshipmentioning

confidence: 99%

Section: Tensile Force-root Diameter Relationshipmentioning

confidence: 99%

See 2 more Smart Citations

Root Tensile Resistance of Selected Pennisetum Species and Shear Strength of Root-Permeated Soil

Ettbeb

Rahman

Idris

et al. 2020

Applied and Environmental Soil Science

View full text Add to dashboard Cite

show abstract

“…Vegetation can be bene cial for stabilizing slopes through mechanical reinforcement (Coppin and Richards 1990;Gray and Sotir 1996;Norris et al 2008;Mejier et al 2017). However, the use of plants for engineering actions, provide quantitative information on the in uence of root system development on slope stability (Maffra et al 2019). Most of the mass movement processes that have occurred in Mexico in recent decades have been induced by rain.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Root Native Tree Species on Soil Shear Strength on Hillslopes of Sierra Madre Oriental, Mexico

Zavala-González¹,

Silva²,

González‐Rodríguez³

2020

Preprint

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Background: The presence of vegetation reduces soil erosion and shallow slope failure both by reinforcing soil shear resistance and influencing the geo-mechanic conditions of soil. For this reason, vegetation strategies in areas vulnerable to erosion are considered to be an effective control measure for soil erosion. Method: The tree species used in this research are widespread in the slopes of Chipinque mountain of Sierra Madre Oriental and belong to four native species: Cercis canadensis, Celtis laevigata, Quercus rysophylla and Ligustrum lucidum. In order to investigate the mechanical characteristics of roots, single roots specimens were sampled and tested for tensile strength. The tests were conducted with the Universal Testing Machine Shimadzu type SLFL-100KN to evaluate the influence of root shear strength on the soil using the Wu Model (Wu et al., 1979) as well as to analyze root cohesion and Root Area Ratio (RAR). The latter was calculated by taking both direct (field) and indirect measurements on image processing.Results: The results show that C. laevigata roots have the strongest tensile strenght, followed by Q. rysophylla > C. Canadensis > L. lucidum. RAR ranges from C. laevigata (0.0587%) > C. Canadensis (0.0585%) >L. lucidum (0.0504%) > Q. rysophylla (0.0441%). L. lucidum provides the less increase soil shear strength through root cohesion (16.12 kN/m2) > C. canadensis (53.70 kN/m2) > Q. rysophylla (89.07 kN/m2) to C. laevigata (97.41 kN/m2)

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Root biomechanical properties of Chrysopogon zizanioides and Chrysopogon nemoralis for soil reinforcement and slope stabilisation

et al. 2021

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Plant root reinforcement in soil bioengineering has gained increasing interest as a means of sustainable and environmentally friendly soil reinforcement and stabilisation. While Chrysopogon zizanioides is widely distributed in tropical regions worldwide and has been advocated for use in slope stabilisation and soil erosion control, C. nemoralis is normally distributed in mountainous areas in Southeast Asian countries, and its potential to reinforce soil has rarely been explored in the soil bioengineering literature. With the importance of root properties in soil bioengineering, this study was carried out to provide a comprehensive dataset of root biomechanical properties, morphological traits, and root reinforcement of these two contrasting vetiver species. A series of experiments, including root observation with a rhizobox system, uniaxial tensile test, and direct shear test, was performed. Results showed that Young's modulus and diameter of C. nemoralis roots were almost 1.4‐ and 1.3‐times greater than those of C. zizanioides roots (p < 0.05). By contrast, no significant difference between the two vetiver species was observed in terms of tensile strength, 'side' root area ratio (RARS), and root orientation (p > 0.05). The diameter–strength (R2 = 0.55–0.56, p < 0.05) and diameter–modulus relationships (R2 = 0.51–0.6, p < 0.05) of both species were consistent with negative power‐law models. Conversely, their diameter–orientation relationship followed a linear model (R2 = 0.85–0.89; p > 0.05). The soil shear strength in terms of cohesion greatly increased in the presence of the roots of C. nemoralis (Δc = 4.9 kPa) and C. zizanioides (Δc = 4.4 kPa). Therefore, C. nemoralis could be an alternative to C. zizanioides in soil bioengineering applications.

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The Effect of Roots on the Shear Strength of Texturally Distinct Soils

Cited by 22 publications

References 35 publications

Root Tensile Resistance of Selected Pennisetum Species and Shear Strength of Root-Permeated Soil

Root Tensile Resistance of Selected Pennisetum Species and Shear Strength of Root-Permeated Soil

The Effect of Root Native Tree Species on Soil Shear Strength on Hillslopes of Sierra Madre Oriental, Mexico

Root biomechanical properties of Chrysopogon zizanioides and Chrysopogon nemoralis for soil reinforcement and slope stabilisation

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