Shear strength of a vegetated soil incorporating both root reinforcement and suction

Pallewattha, Muditha; Indraratna, Buddhima; Rujikiatkamjorn, Cholachat

doi:10.1016/j.trgeo.2018.11.005

Cited by 26 publications

(9 citation statements)

References 16 publications

(15 reference statements)

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“…Beside, roots can intercept the failure plane, additional shear strength can be attributed to matric suction as root water uptake causes partial saturation of shallow soil layers which results in increased matric suction (Simon and Collison, 2002;Yildiz et al, 2019). Pallewattha et al (2019) also concluded that the shear strength of root-permeated sandy is governed by the level of applied suction.…”

Section: Journal Of Environmental Biology May 2021¨8mentioning

confidence: 99%

Contribution of root tensile of Pennisetum polystachion on shear strength of sandy soil in slope bio-engineering technique

Rahman¹,

Ettbeb²,

Idris³

et al. 2021

JEB

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Aim: In soil bio-engineering, plant has been widely adopted as important material in promoting sustainable ecological function in slope instability measures. Plant canopy provides shelter and at subsurface level, root networking attributes toward stability of soil against erosion and slope failure. To investigate the potential of selected P. polystachion as biological material in soil bio-engineering for improving the soil shear strength of sandy soil planted with P. polystachion. Methodology: The selected species was initially planted using hyroseeding technique on studied plots which facilated with and without fiber netting (made of paddy straw). A control plot was also prepared for reference of this study. The plots were routinely watered twice a day for six months before experimental program was scheduled for determining of root tensile and soil shear strength tests. Results: The root tensile strength of P. polystachion exhibited a positive significant relationship between root tensile force and root diameter. The shear strength of soil was affected by the presence of root if compared to that of soil without root (control). Biomass analysist also agree with the soil water content, ws. High biomass contributed to the increase in the values of soil shear strength parameter of cohesive, c and angle of friction, q for root-permeated soil with P. polystachion. Interpretation: This study has suggested that the potential application of this selected species for slope vegetation in improving the erosion control and slope stability in soil-bioengineering scheme.

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Section: Journal Of Environmental Biology May 2021¨8mentioning

confidence: 99%

Contribution of root tensile of Pennisetum polystachion on shear strength of sandy soil in slope bio-engineering technique

Rahman¹,

Ettbeb²,

Idris³

et al. 2021

JEB

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“…However, in reality, short roots are more likely to be pulled out rather than be broken during the failure process of root-soil composites (Ghestem et al 2014;Ji et al 2018). Though long roots suffering from greater soil friction are easier to break than short ones, they could transfer soil shear stress of surface soil to deep stable soil by root tension so as to improve the stability of superficial soil (Fan & Su 2008;Pallewattha et al 2019;Saifuddin et al 2015). Herbaceous plants usually have relative short roots, which is an advantage for herbaceous plants in preventing top soils from surface sliding.…”

Section: Root Spacingmentioning

confidence: 99%

Untitled

2021

JSM

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The mechanical properties of root system play an important role in soil reinforcement by plants. Root tensile properties are affected by many factors. It is necessary to explore the mechanical properties of root system and the influencing factors. In this study, tensile tests were conducted on roots of Kochia scoparia (L.) Schrad and Artemisia sacrorum Ledeb to study root tensile properties, including maximum tensile force, tensile strength and elastic modulus under the three factors, gauge length (50, 100, 150, and 200 mm), root spacing (0, 1, and 2 cm) and root number (single root, double roots, and triple roots). The results showed that the maximum tensile force, tensile strength, and elastic modulus of the roots decreased with increasing gauge length in power functions. Under 100 mm gauge length, the maximum tensile force, tensile strength and elastic modulus decreased with increasing root spacing, but the effect of root spacing considered in this study on the maximum tensile force and tensile strength was not significant. Besides, with increasing root number, the maximum tensile force increased, tensile strength, and elastic modulus decreased. These findings stretched our understanding of the relationship between gauge length, root spacing and root number on root tensile characteristics, and provided the necessary data basis for root tensile properties and soil reinforcement by plants.

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“…There is a trend of mutual dislocation between roots and soil in the common process of deformation. This dislocation is resisted by the frictional resistance between roots and soil, which enhances the shear strength of the root–soil complex 4 and improves the soil consolidation capacity. Therefore, the study of the frictional characteristics of root–soil contact surfaces is the key to the study of root–soil consolidation mechanisms 5 .…”

Section: Introductionmentioning

confidence: 99%

Study on the cohesive shear characteristics and intrinsic modelling of the root–tailing soil interface of Amorpha fruticosa

Yang

Hao

Cheng

et al. 2022

Sci Rep

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To study the soil consolidation effect of shrub plant roots on tailings soil and to explore the frictional characteristics of plant roots on tailings soil, three experimental conditions of the root–soil interface were established by using a modified indoor direct shear instrument with binders such as liquid sodium silicate and cyanoacrylate to conduct direct shear frictional tests at the root–soil interface using the roots of the typical slope protection plant Amorpha fruticosa. The Gompertz improved curve model was established by using the relationship between shear stress and shear displacement and the trend of the root–soil interface parameter index. The results were compared between the improved Gompertz curve model and the Clough–Duncan hyperbolic model, and a two-factor coupled improved Gompertz interfacial intrinsic structure model with normal stress and cohesive strength factor was established. The results showed that the interface shear stress and shear displacement showed strain hardening characteristics at different normal pressures for cohesive strength ratios of 1.5 and 1.7 at the root–tailing soil interface. At a cohesive strength ratio of 1.6, strain-softening was observed from 100 to 300 kPa and strain hardening was observed at 400 kPa. The improved Gompertz curve model predicts the shear stress and shear displacement curves at the root–soil interface with different cohesive strengths more reasonably than the Clough–Duncan hyperbolic model, and the maximum accuracy can be improved by nearly 40%. The two-factor coupled improved Gompertz curve model can fit the shear stress versus shear displacement relationship at the A. fruticosa root–tailing soil interface.

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Shear strength of a vegetated soil incorporating both root reinforcement and suction

Cited by 26 publications

References 16 publications

Contribution of root tensile of Pennisetum polystachion on shear strength of sandy soil in slope bio-engineering technique

Contribution of root tensile of Pennisetum polystachion on shear strength of sandy soil in slope bio-engineering technique

Untitled

Study on the cohesive shear characteristics and intrinsic modelling of the root–tailing soil interface of Amorpha fruticosa

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