Rapid prototyping of geosynthetic interfaces: Investigation of peak strength using direct shear tests

Fowmes, Gary John; Dixon, Neil; Fu, Liwei; Zaharescu, Catalin Alexandru

doi:10.1016/j.geotexmem.2017.08.009

Cited by 38 publications

(11 citation statements)

References 28 publications

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“…The tests were conducted at normal stresses of 25, 50, 100, 200, and 400 kPa. The applied methodology and parameters were chosen based on [8,11,17] recommendations. The test procedures were executed in accordance with ASTM D5321 and are summarised below [18].…”

Section: Device and Test Proceduresmentioning

confidence: 99%

“…Although different textured geomembranes with asperities of diverse shapes, density, and height are presently available, further research into the effect of different asperity configuration on the GMB/GTX interface shear resistance is needed. To date, only a few studies by [9,10] have investigated the influence of asperity height on the GMB/GTX interface behaviour, while other studies by [11,12] have investigated the effect of asperity density. More so, [13,14] considered GMB/GTX interfaces between a few different geomembranes and a polypropylene geotextile in unsaturated conditions and GMB/GTX interfaces between geomembranes and both polypropylene and polyester geotextiles in saturated conditions, respectively.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Asperities and Surface Roughness on Geomembrane/Geotextile Interface Friction Angle

Adeleke

Kalumba

Nolutshungu

et al. 2021

Int. J. of Geosynth. and Ground Eng.

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This paper presents the results of a comprehensive study that investigated the influence of asperities and roughness on the shear responses of geomembrane/geotextile interfaces. This study was aimed at providing a scientific explanation of the effect of surface texturing on geomembrane/geotextile interfaces shear behaviour as well as to recommend the quantification of asperity and roughness characteristics which mobilises optimised shear strength for the considered interface. The GMB/ GTX interface shear tests were conducted according to ASTM D5321, under saturated conditions with the "305 mm by 305 mm" direct shear box at applied normal stresses of 25-400 kPa. The experimental outcome showed that the variation in geomembrane asperity height and surface roughness (from slightly textured to highly textured geomembranes) eventually mobilised an increase of 20° in the peak interface friction angle values. It was, however, observed that as the surface texturing was increased, more pronounced wear occurred which resulted in a relatively minimal increase of 6° in the large displacement friction angle. In addition, the geomembrane surface with asperity height of 1.2 mm and average surface areal roughness of 75 μm was observed to develop optimal peak friction angle for the considered geomembrane/geotextile interface. These observations were validated by means of post-shear deformation evaluation and it is anticipated that the findings presented herein would be useful in the design of geotechnical systems comprising of geomembrane/geotextile interface with enhanced stability and durability

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Section: Device and Test Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Asperities and Surface Roughness on Geomembrane/Geotextile Interface Friction Angle

Adeleke

Kalumba

Nolutshungu

et al. 2021

Int. J. of Geosynth. and Ground Eng.

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“…The PLA filament is often suggested as a geosynthetic bioplastic material that has the advantage of rapid manufacturing and sustainability. [27,28]. The interfacial structure model is composed of a single structure without asperity and three other structures having single triangular asperities with tilt angles of 10 • , 20 • , and 30 • (Figure 3a).…”

Section: Interfacial Structure Modelmentioning

confidence: 99%

Interfacial Shearing Behavior along Xanthan Gum Biopolymer-Treated Sand and Solid Interfaces and Its Meaning in Geotechnical Engineering Aspects

Lee

Cho

et al. 2020

Applied Sciences

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Recently, environment-friendly microbial biopolymer has been widely applied as a new construction material in geotechnical engineering practices including soil stabilization, slope protection, and ground injection. Biopolymer is known to exhibit substantial improvements in geotechnical properties, such as shear strength enhancement and hydraulic conductivity reduction, through the formation of direct ionic bonds with soil particles, especially clay particles. Moreover, the rheological characteristics (e.g., pseudoplasticity, shear-rate dependent thixotropy) of biopolymers render distinctive behaviors such as shear thinning and lubrication effect under a high strain condition, while recovering their viscosities and shear stiffnesses when they are at rest. To ensure the practical applicability of biopolymer-based soil treatment, it is important to understand the interfacial interaction (i.e., friction) between biopolymer-treated soil and adjoining structural members which can be constructed in a biopolymer-treated ground. Thus, in this paper, interfacial shearing behavior of biopolymer-treated soil along solid surfaces as well as internal shearing on biopolymer-soil matrix were explored via direct and interface shear test. Experimental results show a predominant effect of the soil moisture content on the interfacial shear behavior of biopolymer-treated soil which attributes to the rheology transition of biopolymer hydrogels. At low moisture content, condensed biopolymer biofilm mobilizes strong intergranular bonding, where the interfacial shear mainly depends on the physical condition along the surface including the asperity angle. In contrast, the biopolymer induced intergranular bonding weakens as moisture content increases, where most interfacial failures occur in biopolymer-treated soil itself, regardless of the interface condition. In short, this study provides an overall trend of the interfacial friction angle and adhesion variations of xanthan gum biopolymer-treated sand which could be referred when considering a subsequent structural member construction after a biopolymer-based ground improvement practice in field.

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“…Compared to other geosynthetic products, geotextiles show a higher efficiency when fine-grained soils are employed as the bulk backfill material in reinforced soil structures [12,13]. The interfacial shear strength between geotextiles and backfill materials has been extensively studied because it is one of the most pivotal factors that influence the stability of reinforced structures [7,8,[14][15][16][17][18][19][20][21][22][23][24]. Several methods, such as using a thin layer of frictional material around the reinforcement or employing chemically treated geosynthetic fabrics, have been proposed in the literature for improving the interfacial shear strength between geotextiles and fine-grained soils [8, [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

A Bioinspired Technique for Improving the Interaction Between Cohesive Soil and Geotextile Reinforcements

Mohammadi

Habibagahi

Hataf

2021

Int. J. of Geosynth. and Ground Eng.

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Reinforced soil structures often cannot perform properly when there is a weak interface which is not capable of mobilizing the required shear strength between fine-grained soils and the reinforcing elements. The calcium carbonate precipitation (CCP) technique adopted in this research has proved to be extremely useful in removing this deficiency. In this study, plantderived urease-induced calcium carbonate precipitation (PDUICCP) was used as a novel method to improve the performance of the interface. Instead of using commercial-grade purified urease, the extract of soybean seeds was mixed with calcium chloride and urea to prepare a precipitating solution to reduce the costs. In addition, xanthan gum was used as a benchmark to examine the efficiency of the calcium carbonate precipitation process. Modified direct shear tests were performed on the kaolin clay specimens with two different relative compactions, three concentrations of the precipitating solution, and three different geotextiles to assess the performance of the proposed method. The results revealed that the application of the proposed method improved the interfacial shear strength considerably with the interface efficiency increasing from 12 to 270% depending on the geotextile texture and roughness, the relative soil compaction, and the concentration of the precipitation solutions. The highest increase in the interfacial shear strength for all the concentrations of the precipitating solutions was obtained when the polypropylene nonwoven geotextile was used. In all the cases, increasing the relative soil compaction enhanced the interfacial shear strength and interface efficiency. The optimal concentration of the constituents in the precipitating solution was obtained when 0.64 molar (M) calcium chloride and 1 M urea were used. The results of this study can mark the beginning of a new type of geosynthetics with multiphase strength parameters after the addition of environmentally friendly materials. Moreover, they pave the way for using fine-grained soils as the bulk backfill material in reinforced soil structures where coarse-grained soil is not readily available.

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Rapid prototyping of geosynthetic interfaces: Investigation of peak strength using direct shear tests

Cited by 38 publications

References 28 publications

The Influence of Asperities and Surface Roughness on Geomembrane/Geotextile Interface Friction Angle

The Influence of Asperities and Surface Roughness on Geomembrane/Geotextile Interface Friction Angle

Interfacial Shearing Behavior along Xanthan Gum Biopolymer-Treated Sand and Solid Interfaces and Its Meaning in Geotechnical Engineering Aspects

A Bioinspired Technique for Improving the Interaction Between Cohesive Soil and Geotextile Reinforcements

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