Quantifying the effects of geogrid reinforcement in unbound granular base

Han, Bingye; Ling, Jianming; Shu, Xiang; Song, Weimin; Boudreau, Richard L.; Hu, Wei; Huang, Baoshan

doi:10.1016/j.geotexmem.2019.01.009

Cited by 39 publications

(10 citation statements)

References 26 publications

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“…Sustainability 2020, 12,1929 2 of 11 different conditions [9][10][11][12][13]. The mechanisms of geosynthetics can be summarized as: (i) to restrain the lateral movement of the unbound materials (due to frictional interaction and interlocking between aggregates and the geosynthetic), (ii) to increase the stiffness and the shear strength of the unbound materials by providing additional confining stress, (iii) to improve the load distribution to the subgrade layer, and (iv) to reduce the shear stress in the subgrade (due to its stiffness, the geosynthetic exerts an upward force supporting the wheel load and thus improving the bearing capacity [14]; this is because it acts like a tensioned membrane [15]).…”

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confidence: 99%

Finite Element Analysis of Geogrid-Stabilized Unpaved Roads

et al. 2020

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The need to increase the durability of unpaved roads and the need to improve driver comfort have led to this research: to focus more attention on the use of reinforcements for this type of road. Unpaved roads are created by using an unbound granular base layer placed on compacted cohesive soils. When the subgrade is weak, due to its poor consistency and high compressibility, generally, a geosynthetic reinforcement (geogrid and/or geotextile) is placed over the subgrade, followed by a compacted granular fill layer. The use of geosynthetics can produce several benefits, such as draining, reinforcement, filtering, separation, and proofing. This paper aims to present a numerical investigation using 3-D Finite Element Modeling (FEM) to analyze the improvement, in terms of the rutting reduction of an unpaved road system, reinforced by a geogrid, under repeated traffic loads. 3-D FEM analysis was carried out on two unpaved road sections, one reinforced and the other unreinforced, with both subjected to an impulsive wheel loading. It can be concluded that a significant improvement in pavement behavior is obtained by placing a geogrid layer at the base-subgrade interface. In fact, the obtained results show that geogrid reinforcement can provide a relevant contribution to the reduction of permanent deformations.

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confidence: 99%

Finite Element Analysis of Geogrid-Stabilized Unpaved Roads

et al. 2020

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“…Gu [46] shows that the influence of geogrids on resilient modulus is greater at relatively low stress levels. Byun et al [48] report lower values of resilient moduli when determined by cyclic load triaxial test for stabilized samples, compared to an unstabilized sample and conclude, just like in [67], that resilient moduli determined in this way can not be used for determining the effect of geogrids on the stabilization of granular materials. Although the cyclic load triaxial test according to current standards have revealed to be favourable for determining resilient moduli and permanent deformation of (unreinforced) materials that are incorporated in base course, in the case of samples stabilized by geogrids, the tests are currently favourable for determining permanent deformations only.…”

Section: Significant Findings Based On Published Cyclic Load Triaxial Test Resultsmentioning

confidence: 97%

“…Although the cyclic load triaxial test according to current standards have revealed to be favourable for determining resilient moduli and permanent deformation of (unreinforced) materials that are incorporated in base course, in the case of samples stabilized by geogrids, the tests are currently favourable for determining permanent deformations only. Therefore, other tests can be used for determining stiffness of composites, such as for instance the cyclic (direct) shear test, which is reported by Han et al [67] to be suitable for reinforced soil.…”

Section: Significant Findings Based On Published Cyclic Load Triaxial Test Resultsmentioning

confidence: 99%

Testing noncohesive geogrid-reinforced soil in triaxial shear apparatus under cyclic loading

Lakušić¹

2021

JCE

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In road base layers, geogrids assume the reinforcement or stabilization function where good interaction between geogrid and unbound base material is important. The cyclic triaxial test can be used for analysing interaction between geogrid and unbound base material. The paper includes an overview of research where cyclic triaxial test is primarily used for assessing the influence of parameters such as geogrid stiffness, geometry and aperture size, position and number of geogrid layers, on the interaction with the base layer material. The cyclic triaxial test can be used to determine contribution the geogrid application in non-cohesive materials has on the reduction of permanent deformations.

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“…Generally, in terms of the stress field applied during the test, the direct shear test includes pure direct shear test and direct shear test with normal stress. e pure direct shear test only applies shear force to the interface of specimen without normal stress, such as Superpave shear tester [17], Leutner shear test [14], Laboratory Bond Interface Strength device [18], and Florida Department of Transportation shear tester [19]. However, there is almost no pure shear stress state in the interface of composite pavement.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation on the Interface Bonding between Portland Cement Concrete Pavement and Asphalt Overlay

Wei

Jian-feng

Zhao

et al. 2021

Mathematical Problems in Engineering

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The interface bonding between Portland cement concrete (PCC) pavement and hot-mix asphalt (HMA) overlay plays an important role in the performance of the composite pavement. This research conducted a series of comprehensive laboratory studies to investigate the influence factors of the interface bonding strength using a self-designed direct shear test apparatus that can simultaneously apply normal stress and shear stress on a specimen. Four kinds of commonly used tack coat materials were systematically tested and compared under various combinations of normal stress and temperature. Then, coupling effects of the normal stress and temperature on the interface bonding between PCC and HMA were analyzed. The test results show that temperature has a significant impact on the adhesion of the tack coat. Emulsified asphalt was considered the optimal tack coat material because of its simple construction method. In addition, it was found that a damaged interface could still provide considerable bonding strength. Normal stress generated by traffic loads was beneficial to the interface bonding strength, especially at lower temperatures. The temperature had a significant effect on interface bonding and played a leading role in the failure mode of interface bonding.

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Quantifying the effects of geogrid reinforcement in unbound granular base

Cited by 39 publications

References 26 publications

Finite Element Analysis of Geogrid-Stabilized Unpaved Roads

Finite Element Analysis of Geogrid-Stabilized Unpaved Roads

Testing noncohesive geogrid-reinforced soil in triaxial shear apparatus under cyclic loading

Laboratory Investigation on the Interface Bonding between Portland Cement Concrete Pavement and Asphalt Overlay

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