Parameters to predict slope stability—Soil water and root profiles

Osman, Normaniza; Barakbah, S.S.

doi:10.1016/j.ecoleng.2006.04.004

Cited by 143 publications

(50 citation statements)

References 6 publications

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“…In addition, the vertical trendline with high gradient (R 2 = 0.548) implies that above ground biomass of Z. Japonica does not have influence on its peak shear strength throughout its growth period. It should be noted that stable soil is primarily due to high biomass, which likely resulted in high soil water loss through plant transpiration [18]. However, it seems that the rule does not apply in this situation.…”

Section: Relationship Between Shear Strength Moisture Content and Bimentioning

confidence: 94%

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The Soil-Root Strength Performance ofAlternanthera FicoideaandZoysia Japonicaas Green Roof Vegetation

et al. 2017

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Abstract. The rise of awareness on environmentalism has demanded that all parties involved in built environment to implement green technology in their construction projects. Great care must be taken when designing a green roof system including the selection of plants and appropriate substrates. This study was performed to investigate the soil-root composite strength of two types of green roof vegetation (A. Ficoidea and Z. Japonica) at different growth periods for up to 6 months. Both plants were planted in six plastic plots (45 cm × 29 cm × 13 cm) containing a mixture of perlite, vermiculite and organic soil. Every two months, a series of direct shear tests were conducted on a sample from each species to determine the root-soil shear strength. The tests continued until the 6 th month. The average results showed that Z. Japonica had higher soil-root shear strength (49.1 kPa) compared to A. Ficoidea after two months of growth. In the 4 th month however, A. Ficoidea managed to surpass Z. Japonica (28.7 kPa versus 18.5 kPa) in terms of shear strength. However, their average peak shear strength decreased sharply compared to the previous month. Lastly, in six months, A. Ficoidea sustained a higher average peak soil shear strength (56.5 kPa) compared to Z. Japonica (14.3 kPa). Therefore, it can be concluded that A. Ficoidea may offer a better soil reinforcement than Z. japonica and thus it could potentially be a good choice of green roof vegetation.

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Section: Relationship Between Shear Strength Moisture Content and Bimentioning

confidence: 94%

“…Normally, when soil moisture content decreases, the shear strength of soil will increase. As discussed by [18], saturation of soil will reduce the shear strength due to buoyancy reduction in normal force and it could also destroy the capillarity and apparent cohesion of soil.…”

Section: Relationship Between Shear Strength Moisture Content and Bimentioning

confidence: 99%

The Soil-Root Strength Performance ofAlternanthera FicoideaandZoysia Japonicaas Green Roof Vegetation

et al. 2017

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“…The role of vegetation in preventing shallow landslides due to a considerable increase in the soil moisture content during or after heavy rainfall is important. Normaniza and Barakbah (2006) suggested that both the soil moisture content and the root length density (RLD) could be used as indicators of slope stability. Fan and Su (2008) found that the effect of soil moisture content on the shear strength increase provided by roots was significant.…”

Section: Introductionmentioning

confidence: 99%

Effect of soil moisture content on the deformation behaviour of root-reinforced soils subjected to shear

Fan

2008

Plant Soil

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This paper presents an experimental study on how soil moisture content affects the deformation behaviour within root-reinforced soils subjected to shear. In-situ shear tests were carried out in this research. The plant used in the shear tests was Prickly Sesban (Sesbania cannabina Merr.). The shear deformation within the root-reinforced soil after shear was measured. The effect of soil moisture content and the root area ratio on the development of the shear zone was investigated. The experimental results showed that the deformed shape within the soil for rootreinforced soils subjected to shear correlated well with the exponential decay function. The width of the shear zone of root-reinforced soils increases with increasing soil moisture content. Additionally, the width of the shear zone increases with increasing root area ratio. Widths of the shear zone developed in front of and beside the root structure are greater than those behind the root structure. Finally, the mechanism between the shear strength increase provided by roots and the development of the shear zone width are discussed in this paper.

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“…These species, namely Justicia betonica, Tabernaemontana corymbosa, Polycias sp. and Evodia latifolia, were chosen based on the prominent criteria as slope plants in previous pilot trials [4] .…”

Section: Methodsmentioning

confidence: 99%

The Role of Pioneer Vegetations in Accelerating The Process of Natural Succession

S.¹

2009

American Journal of Environmental Sciences

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Problem Statement: Even though bioengineering technique has been regarded as one way to alleviate landslide and erosion problems, this process of revegetation is severely time consuming as the process of plant succession of the slopes may take decades or even hundreds of years. Approach: However, the process can be tremendously hastened by planting the right suitable pioneer species on the slopes. In this project, a natural succession experiment was conducted to determine the role of a potential slope colonizer, L. leucocephala, as a good pioneer in two years of observation. Results: In terms of the plant community, L. leucocephala had tremendously accelerated the plant succession of the slope. Within two years, 46 species comprising various species of grasses, shrubs and small trees colonized in the mixed culture treatment. The plant diversity increased drastically, about five (12 months) and eight fold (24 months) of its initial (0 month) diversity against 2.5 (12 months) and three fold (24 months) in the monoculture treatment. Related to this species-richness, LAI and biomass of the plant community was also enhanced in the mix-culture system. Conclusion: The results indicate that the species studied exhibits an outstanding pioneering characteristic by enhancing natural succession and the revegetation process which will be in turn, resulting in a more stable ecosystem.

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Parameters to predict slope stability—Soil water and root profiles

Cited by 143 publications

References 6 publications

The Soil-Root Strength Performance ofAlternanthera FicoideaandZoysia Japonicaas Green Roof Vegetation

The Soil-Root Strength Performance ofAlternanthera FicoideaandZoysia Japonicaas Green Roof Vegetation

Effect of soil moisture content on the deformation behaviour of root-reinforced soils subjected to shear

The Role of Pioneer Vegetations in Accelerating The Process of Natural Succession

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