Laboratory evaluation of the behavior of a geotextile reinforced clay

Noorzad, Reza; Mirmoradi, S.H.

doi:10.1016/j.geotexmem.2009.12.002

Cited by 74 publications

(23 citation statements)

References 22 publications

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“…Water-saturation of the shearing zone of the samples caused the decrease of the interfacial friction resistance from 14% to 1% at the degree of compaction I S = 0.90, and from 20% to 1% at the degree of compaction I S = 1.00, with the increase in normal stresses from 50 to 300 kPa. This relationship is consistent with results presented by Noorzad and Mirmoradi [61], Khoury et al [62], Cahi and Saito [53] or Jotisankasa and Rurgchaisiri [4] obtained for different soils and geotextiles, and it is consistent with the theory of shear strength of unsaturated soils [63]. Theory and test results indicate that the presence of suction stress within unsaturated soil causes its shear strength to be higher than that of saturated soil.…”

Section: Shear Strength and Interfacial Friction Resistancesupporting

confidence: 91%

The Influence of Compaction and Water Conditions on Shear Strength and Friction Resistance between Geotextiles and Ash-Slag Mixture

2020

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The paper presents the results of tests of the shear strength of the ash-slag mixture taken from the landfill located in Kraków (Poland) and the interfacial friction resistance at the contact between the ash-slag mixture and woven or nonwoven geotextiles. The tests were carried out in a direct shear apparatus on samples with and without water saturation. The samples for testing were formed in the apparatus box at the optimum moisture by compacting them to I S = 0.90 and 1.00. The test results reveal that the shear strength parameters of the ash-slag mixture were large. It was stated the significant influence of the compaction, the growth of which has resulted in an increase in the angle of internal friction (from 7% to 9%) and cohesion (from 60% to 97%). Whereas the saturation of the samples reduced the shear strength parameters (from 4% to 6%, of the internal friction angle and 30% to 43% of cohesion). The values of the interfacial friction resistance at the contact between the ash-slag mixture and the geotextiles were large as well, but slightly smaller than the values of the shear strength parameters of the mixture itself. The compaction caused an increase in the angle of interfacial friction (from 1% to 5%) and adhesion (from 31% to 127%). The water-saturation of the samples caused a change in the angle of interfacial friction (from −6% to 3%) and decline in the adhesion (from 22% to 69%). Values of the interaction coefficient were about 0.8-1.0 and they tended to rise with increasing the normal stress. Higher values of this parameter were obtained in tests with water saturation and for non-woven geotextiles.Another problem is the proper selection of a backfill material and its compaction. It is usually recommended to use materials with a high shear strength. As a filling, industrial wastes arising, for example, in the production of coal (coal shales), electricity or heat as a result of the coal combustion (ash slag mixtures, fly ash, slag, microsphere, ashes from the fluidized furnace) are also increasingly used. Wastes are generated in the combustion processes because there are large amounts of non-flammable substances, their content in coal ranges from 11% to 17% (hard coal extracted in Poland) and from 3% to 11% (lignite) [8]. The by-products of combustion can be used as artificial aggregates in earth structures [8][9][10][11]. The utilisation of these products in earth structures is of great importance from the economic and ecological points of view. The use of artificial aggregates and geosynthetics for strengthening the soil subgrade also has a significant impact on the protection of natural aggregates. It makes possible constructing the embankments of the selected industrial wastes and limits the scope of soil exchange.In order to meet current requirements for earthworks, the use of geosynthetics that satisfy the requirements for acceleration and quality of works, as well as the optimization of costs of road pavement construction, have been started [12]. In addition to the versatility of using geosynt...

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Section: Shear Strength and Interfacial Friction Resistancesupporting

confidence: 91%

The Influence of Compaction and Water Conditions on Shear Strength and Friction Resistance between Geotextiles and Ash-Slag Mixture

2020

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“…A great number of studies have been conducted in order to use geotextile in applications such as strengthening and reinforcing the retaining walls [7], drainage in water transfer canals [8], and dams [9]. In erosion control, the geotextile protects soil surfaces from the tractive forces of moving water and rainfall erosion.…”

Section: Introductionmentioning

confidence: 99%

Control of the Local Scouring Around the Cylindrical Bridge Pier Using Armed Soil by Geotextile

Imamzadehei

Heidarpour

Imamzadehei

et al. 2016

Int. J. of Geosynth. and Ground Eng.

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Flood currents are considered threatening factors by creating local scour along bridge piers. One method for decreasing local scour is to strengthen the bed against imposed tensions. Among methods which can be appropriate in decreasing and controlling local scour of bridge piers directly is to put riprap beside bridge piers and to employ geotextile around them. Geotextiles form a large group of geosynthetic products produced from polypropylene and polyester fibers, and are used in separation, strengthening and reinforcing, filtration, and drainage. In the present study, the effect of geotextile layer in decreasing local scour of cylindrical single-pier was investigated and the best coverage pattern with the most effect was obtained so that layers with circular and oval shapes were put around the pier relative to its diameter, and the performance of each was compared with the unprotected pier. Test results showed by using geotextile with an appropriate cover, the scour location is transferred to downstream and the scour depth is decreased. These advantages can reduce the risk of pier failure when the duration of flood is short. The results indicate that the scour reduction increases as the layer area increased. In this case the oval layer has a better efficiency compared to the circular one.

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“…Utilizing tensile elements, such as fibers and fiber bundles to improve the tensile strength and the flexural strength, has the advantage of improving the strength and durability of improved soil and will furthermore be effective because of its strength isotropy, absence of potential failure plane, improvement in peak friction angle and cohesion, environmentally savings and economical cost (Kaniraj and Havanagi, 2001;Sobhan and Mashnad, 2002;Yetimoglu et al, 2005;Kumar et al, 2006;Viswanadham et al, 2009;Park, 2011;Hejazi et al, 2012;Mirzababaei et al, 2012;Onyejekwe and Ghataora, 2014;Jamsawang et al, 2014). Several past studies have proved the effectiveness of polymer fiber reinforcement in treating cemented soft soil and provided experimental evidence on the improvement in its mechanical behavior (Li et al, 1995;Kaniraj and Gayathri, 2003;Tang et al, 2007;Park, 2009;Noorzad and Mirmoradi, 2010;Tang and Gu, 2011). However, most of these earlier investigations have focused on polypropylene fiber as a reinforcement material only and furthermore neglected crucial information such as the effect of cement content, fiber content and fiber length.…”

Section: Introductionmentioning

confidence: 99%

Laboratory evaluation on the effectiveness of polypropylene fibers on the strength of fiber-reinforced and cement-stabilized Shanghai soft clay

Shen

Arulrajah

et al. 2015

Geotextiles and Geomembranes

170

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Laboratory evaluation of the behavior of a geotextile reinforced clay

Cited by 74 publications

References 22 publications

The Influence of Compaction and Water Conditions on Shear Strength and Friction Resistance between Geotextiles and Ash-Slag Mixture

The Influence of Compaction and Water Conditions on Shear Strength and Friction Resistance between Geotextiles and Ash-Slag Mixture

Control of the Local Scouring Around the Cylindrical Bridge Pier Using Armed Soil by Geotextile

Laboratory evaluation on the effectiveness of polypropylene fibers on the strength of fiber-reinforced and cement-stabilized Shanghai soft clay

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