Pullout Tests Using Modified Direct Shear Test Setup for Measuring Soil–Geosynthetic Interaction Parameters

Prashanth, V.; Krishna, A. Murali; Dash, Sujit Kumar

doi:10.1007/s40891-016-0050-x

Cited by 22 publications

(3 citation statements)

References 21 publications

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“…A series of pull-out tests were conducted as per ASTM D6706 [45] to investigate and compare the pull-out resistance of similar tubular and planar reinforcements embedded in sand based on the mechanism B (Figure 2). A modified direct shear test setup was used in these tests [46]. This device could conduct the pull-out tests of the tubular elements with a diameter up to 5 cm and the planar samples of reinforcements with a maximum width of 30 cm.…”

Section: Testing Preparation and Methodologymentioning

confidence: 99%

An experimental investigation into the behavior of sand reinforced by tubular braided structures

Noorbakhsh

Rowshanzamir

Abtahi

et al. 2019

Journal of Industrial Textiles

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This study introduces the tubular braided structure as a new geosynthetic material for sand reinforcement. The performance of a tubular braid under the influence of similar soil–reinforcement interaction mechanisms has been investigated to emphasize the effect of the reinforcement form on the performance of the reinforced soil composite. For this purpose, three series of interaction element tests including direct shear tests, pull-out tests, and soil stress control tests were conducted on the unreinforced and reinforced sand. Finally, the overall performance of the reinforced foundation bed with the planar and tubular reinforcing textile (with similar materials, properties, texture, and areal density) was evaluated through a series of standard plate load tests. The results indicated that the performance of the sand-braid composite was better compared to the similar typical planar reinforcement, except for the case of pull-out test. Tubular braid resulted in the enhanced shear strength of the reinforced soil composites, mobilization of the excess compressive stress in the enclosed soil inside the tubular braids, reduction in the vertical stress level of the footing model transferred down through the soil bed, the increase of the average bearing capacity of the footing model, and a significant reduction in the footing settlement.

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Section: Testing Preparation and Methodologymentioning

confidence: 99%

An experimental investigation into the behavior of sand reinforced by tubular braided structures

Noorbakhsh

Rowshanzamir

Abtahi

et al. 2019

Journal of Industrial Textiles

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“…Modified direct shear test setup (Prashanth and Krishna [32]) was used for conducting the pullout tests. The modification was the replacement of direct shear box with a pullout box (Fig.…”

Section: Pullout Testmentioning

confidence: 99%

Experimental Investigation of Interface Behaviour of Different Types of Granular Soil/Geosynthetics

Choudhary

Krishna

2016

Int. J. of Geosynth. and Ground Eng.

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In this paper, influence of different types of soils and geosynthetics on soil/geosynthetics interface behaviouris investigated by direct shear and pullout tests. Three different types of cohesionless soils and three different types of geosynthetics materials are adopted for experimental investigation. A series of large direct shear tests and pullout tests were conducted to investigate the interface behaviour of soil/geosynthetics. The test equipment, soils, and geosynthetics properties are described. The influence of soil particle size (D 50 ) and geosynthetic structure are discussed by analysing tests results. Results are presented and discussed in terms of peak shear resistance, peak pullout resistance, interface friction angle, efficiency factors and interaction coefficient for different soils and geosynthetics. It could be seen that the interface friction angle from both direct shear and pullout tests linearly increases with increase in (D 50 ) of soil. The pullout interaction coefficients (C i ) are found to be in the range of 0.62-1.72 for different tests conditions.

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“…Past research studies have focused on the shear behavior on the interface between soil and different structures, such as the interface between sand and concrete (Skempton, 1985;Uesugi et al, 1990;Hebeler et al, 2016), clay and concrete (Feligha et al, 2016), soil and steel plate (Mortara et al, 2010), soil and geomembrane (Sayeed et al, 2014;Prashanth et al, 2016;Ammar et al, 2019), and soil and bedrock interface (Jahanian and Sadaghiani, 2015). The shear behavior (shear mechanical characteristics, shear failure modes, and strengthinfluencing factors) of these interfaces has been investigated using experimental shear tests (Fleming et al, 2006;Mortara et al, 2010;Chai and Saito, 2016).…”

Section: Introductionmentioning

confidence: 99%

An Empirical Shear Model of Interface Between the Loess and Hipparion Red Clay in a Loess Landslide

Zhu

Shuaisheng

et al. 2022

Front. Earth Sci.

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Quaternary loess is widely distributed over the tertiary Hipparion red clay on the Loess Plateau of China. Large-scale loess landslides often occur along the weak contact interface between these two sediment materials. To investigate the failure mode and shear strength characteristics of the loess–Hipparion red clay contact interface, a series of shearing experiments were performed on interface specimens using purpose-built shear equipment. In this article, the relationship between shear strength and interface morphology is discussed, and an empirical shear model of the interface is proposed based on the experimental results and theoretical work. The results indicate that discontinuities between the loess and the Hipparion red clay reduce the shear strength of specimens significantly. The contribution of the contact interface to shear performance including failure mode, shear deformation, and shear strength varies with the interface morphology and the applied normal stress. With low interface roughness or normal stress, sliding failure is likely to occur. With increasing interface roughness and normal stress, the peak strength increases rapidly. With further increase in the interface roughness and normal stress, the increment of peak strength decreases gradually as the failure mode transitions from sliding mode to cutoff mode. A staged shear model that takes the failure mode into consideration is developed to express the non-linear change in the interface shear strength. The shear model’s capability is validated by comparing model estimates with experimental data. This work improves our understanding of shear mechanisms and the importance of considering the effects of interfacial properties in the mechanical behavior of contact interfaces.

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Pullout Tests Using Modified Direct Shear Test Setup for Measuring Soil–Geosynthetic Interaction Parameters

Cited by 22 publications

References 21 publications

An experimental investigation into the behavior of sand reinforced by tubular braided structures

An experimental investigation into the behavior of sand reinforced by tubular braided structures

Experimental Investigation of Interface Behaviour of Different Types of Granular Soil/Geosynthetics

An Empirical Shear Model of Interface Between the Loess and Hipparion Red Clay in a Loess Landslide

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