Deformation Characteristics of Reinforced Sand in Direct Shear

Shewbridge, Scott E.; Sitar, Nicholas

doi:10.1061/(asce)0733-9410(1989)115:8(1134)

Cited by 115 publications

(41 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Additionally, the influence of root area ratio on the width of the shear zone at a given range of soil moisture content was also investigated. The deformed shape in the shear zone for root-reinforced soil specimen tested herein was characterized by using the exponential decay function proposed by Shewbridge and Sitar (1989). Moreover, the mechanism between the shear zone width and the shear strength increase provided by roots was also studied and discussed in this paper.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, the stress distribution of roots within the soil subjected to shear may also depend on the root structure and the plant species. Shewbridge and Sitar (1989) indicated that the shear strength increase provided by roots would be directly proportional to the root area ratio if the width of the shear zone is independent of the root area ratio. The width of the shear zone, however, noticeably relies on the root area ratio based on the test results obtained herein, as shown in Fig.…”

Section: Mechanism Between the Shear Strength Increase And The Width mentioning

confidence: 99%

“…The b constant is a measure of the distortion of the shear zone. Shewbridge and Sitar (1989) indicated that the width of the shear zone increases with increasing soilreinforcement bond strength, reinforcement concentration, and reinforcement stiffness. A small b value indicates a thick shear zone.…”

Section: Introductionmentioning

confidence: 99%

“…A linear simple deformation pattern in the shear zone was assumed in the simple root reinforcement model. Shewbridge and Sitar (1989), however, developed an exponential equation to describe the deformed shape of (synthetic) fibrereinforced soils after shear. The fibre reinforcements were placed uniformly and horizontally in the shear box.…”

Section: Introductionmentioning

confidence: 99%

“…The exponential decay equation describing the deformation pattern in the shear zone was expressed as Fig. 2 A schematic of the deformed shape of a vertical fibre reinforcement in the soil subjected to shear as proposed by Shewbridge and Sitar (1989) where y is the axis parallel to the direction of shear; B is one-half of the shear displacement; x is the axis perpendicular to the direction of shear; and b is a deformation decay constant, used to improve the fit for measured and calculated deformed shapes. The b constant is a measure of the distortion of the shear zone.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Fan

2008

Plant Soil

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Mechanism Between the Shear Strength Increase And The Width mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Fan

2008

Plant Soil

View full text Add to dashboard Cite

show abstract

Reforestation Schemes to Manage Regional Landslide Risk

Phillips¹,

Marden²

2005

Landslide Hazard and Risk

View full text Add to dashboard Cite

Analysis of coupled axial and lateral deformation of roots in soil

Meijer

Wood

Knappett

et al. 2018

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Summary Plant roots can help to stabilise slopes. Existing analytical models to predict their mechanical contribution are however limited: they typically focus on the ultimate limit state, employ various empirical factors, and ignore much of the underlying root‐soil interaction. A new model was developed based on large deflection Euler‐Bernoulli elastic beam theory that can be used to study the mobilisation of root strength under various loading conditions (direct shear and pull‐out). Both lateral and axial loading of the root by the soil were incorporated, based on existing methodologies for foundation piles (p‐y and t‐z curves). The model is able to take the key parameters into account (root biomechanical properties, root architectural properties, and soil properties) while remaining quick to solve using a numerical boundary value problem solver. The model was compared with experimental direct shear test data using various root analogues (rubber, plastic, and wood) in dry sand with various densities and effective stress levels and was able to accurately predict the measured shear force‐displacement behaviour. Comparison with experimentally measured pull‐out force‐displacement curves using rubber and wooden root analogues with various architectures in dry and partially saturated sands was also satisfactory. In the future, this model can aid with addressing long‐standing problems in the root‐reinforcement community: quantifying the effect of (sequential) mobilisation of root strength in direct shear, the effect of the angle at which the root crosses a shear plane, the effect of root topology on root‐reinforcement or the effect of root bending, and root shear shear forces on root‐reinforcement.

show abstract

Deformation Characteristics of Reinforced Sand in Direct Shear

Cited by 115 publications

References 7 publications

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

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

Reforestation Schemes to Manage Regional Landslide Risk

Analysis of coupled axial and lateral deformation of roots in soil

Contact Info

Product

Resources

About