Influence of tensile strength of geogrid and subgrade modulus on layer coefficients of granular bases

Baadiga, Ramu; Saride, Sireesh; Balunaini, Umashankar; Madhira, Madhav

doi:10.1016/j.trgeo.2021.100557

Cited by 30 publications

(8 citation statements)

References 20 publications

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“…As shown in Fig. 2, a repetitive load of haversine load pattern with 5 Hz frequency was simulated and applied over the prepared bed with a typical tire contact pressure of 550 kPa using 100 kN actuator on a 300 mm rigid circular plate placed on the center of the testbed [2,3]. Figure 3 presents the typical load pattern applied on the prepared testbed.…”

Section: Experimental Programmentioning

confidence: 99%

“…Alternatively, geosynthetics are highly preferred due to their costeffectiveness and ease of construction. Geosynthetic reinforcement materials, viz., geogrid, and geocell offer various benefits in flexible pavements such as lateral restraint, load-carrying capacity, and membrane support [1][2][3][4]. Similarly, a threedimensional honeycomb structure called geocell offers overall confinement and higher load carrying capacity [1,[5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Performance of Reinforced Base Courses of Flexible Pavements Overlying Soft Subgrades: Insights From Large-Scale Model Experiments

Baadiga¹

2022

GEOMATE

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In this study, large-scale model pavement experiments (LSMPEs) were performed to assess the performance of geosynthetic-reinforced bases of flexible pavements overlying soft subgrades (with California bearing ratio equal to 1% and 5%). Two configurations of reinforcement were considered -(1) base layers reinforced with geocell (GC) alone, and (2) base layers reinforced with geocell and geogrid (GG) combinations (GC+GG). Model pavements were constructed inside the test chamber measuring 1.5m (length) × 1.5m (width) × 1.0m (height). Wheel loads on the pavements were simulated by applying repetitive load equivalent to the tire contact pressure of 550 kPa through an actuator on a rigid circular plate (diameter equal to 300 mm). The reinforcement combination with GC+GG was found to perform better than GC alone due to additional support offered by geogrid when used as a base or basal reinforcement underneath the geocell mattress. The performance was evaluated in terms of cumulative permanent deformations and Traffic Benefit Ratio (TBR) over 100,000 repetitive load cycles. TBRs of the GC+GG combination showed values greater than 50 for test conditions considered. Furthermore, test results showed that the GC+GG combination reduced permanent deformation by up to 78%, while GC alone reduced it by about 52% compared to the unreinforced section. TBRs of geocell alone and geocell with basal geogrid combinations indicated extended service life of the pavement.

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Section: Experimental Programmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of Reinforced Base Courses of Flexible Pavements Overlying Soft Subgrades: Insights From Large-Scale Model Experiments

Baadiga¹

2022

GEOMATE

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“…7. Bearing pressure vs. settlement ratio of pavements reinforced with various geogrid axial stiffness Load improvement factor is defined as the ratio between the bearing pressure under the footing of the reinforced section to that of the unreinforced section under the same settlement [32,33]. Table 3 shows the load improvement factor for various reinforcement axial stiffness.…”

Section: Effect Of Axial Stiffness Of Geogridmentioning

confidence: 99%

Three-Dimensional Analysis of Geogrid Reinforced Flexible Pavement Using Finite Difference Program Flac3d

Rojimol¹

2022

GEOMATE

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India ranks second after the United States in terms of road infrastructure. In recent years, geosynthetics have created an impact on enhancing the life of the pavement. Numerous studies have been done on the application of geosynthetics on the flexible pavement to reduce rutting deformations and fatigue cracks. Laboratory and field studies have cost and time constraints. These limitations can be overcome by making use of numerical models. This research focuses on the numerical analysis of biaxial geogrids in flexible pavement. Proper knowledge of geogrid-pavement layer interaction is essential to obtain an understanding of strains, stresses, and deflections in pavement layers. In this study, a three-dimensional model of the geogrid reinforced unpaved road is developed using the finite difference program -FLAC 3D . Appropriate constitutive models are selected for the pavement layers. Geogrid is modeled using a linear elastic 'geogrid' element in FLAC 3D . The thickness of pavement layers in the analysis is taken as per the codal provisions of IRC: 37-2012. For pavements underlain by weak subgrade, the study shows that geogrid is more efficient in resisting the loads for settlement ratios higher than 2%. Based on the results from the numerical model, the optimal location of geogrid is proposed at one-third base thickness from the top of the surface of the pavement. This study is useful for construction sites where competent aggregates are not available and subgrade CBR is less than 5%.

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“…Despite the high cost of geogrids, they have gained popularity for their wide range of applications in soft soils, but it is important to consider the type of material, geogrid type, and aperture size of the mesh, as many researchers showed that it plays an important role in the performance of mechanically stabilized pavements [3]. The use of geogrids in pavements as reinforcement for pavement layers provides lateral restraint that supports the base and subbase material, this type of reinforcement can help reduce the thickness of the aggregate layer [4]. Moreover, the use of geogrids offers several benefits such as the improvement of surface deformation characteristics to arrest downward deflections, the increase of bearing capacity and the control of the rutting of pavements under traffic loads when it is used in soft subgrades, and the increment of the pavement's service life arresting longitudinal cracks [4]- [6].…”

Section: Introductionmentioning

confidence: 99%

“…The use of geogrids in pavements as reinforcement for pavement layers provides lateral restraint that supports the base and subbase material, this type of reinforcement can help reduce the thickness of the aggregate layer [4]. Moreover, the use of geogrids offers several benefits such as the improvement of surface deformation characteristics to arrest downward deflections, the increase of bearing capacity and the control of the rutting of pavements under traffic loads when it is used in soft subgrades, and the increment of the pavement's service life arresting longitudinal cracks [4]- [6]. However, the available conventional methods such as cement or lime stabilization or fiber reinforcement consume a lot of time and money, which is why several studies have demonstrated that its use is an economic, ecological, and easy-to-construct alternative to traditional techniques.…”

Section: Introductionmentioning

confidence: 99%

Influence of geogrid arrangement on the bearing capacity of a granular soil on physical models and its comparison to theoretical equations

Albuja-Sánchez,

Cóndor,

Oñate

et al. 2023

Preprint

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This study presents an analysis of the influence of geogrid distribution on the bearing capacity of granular soils. For this purpose, the bearing capacity is compared based on 3 arrangements, uniform, trapezoidal, and inverted trapezoidal, with 2 types of geogrids, biaxial and multiaxial, under the application of an axial load. The tests performed were analyzed in three forms in which the trapezoidal distribution was the best arrangement for biaxial and multiaxial geogrids. The first analysis considers the peaks for each stress-strain curve, the trapezoidal distribution increases the bearing capacity by 36% and 33% for biaxial and multiaxial geogrids, respectively. The second analysis considers an s/B ratio of 10%, which had an average increment of 30.5% for the two types of geogrids. The third analysis considers a 20% of s/B ratio, which showed a 56% and 81% of BCR increase for biaxial and multiaxial geogrids respectively. From an economical and environmental analysis, the trapezoidal distribution saves 7% of material compared to the traditional uniform distribution. The comparison between physical and numerical models with theoretical equations is presented.

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Influence of tensile strength of geogrid and subgrade modulus on layer coefficients of granular bases

Cited by 30 publications

References 20 publications

Performance of Reinforced Base Courses of Flexible Pavements Overlying Soft Subgrades: Insights From Large-Scale Model Experiments

Performance of Reinforced Base Courses of Flexible Pavements Overlying Soft Subgrades: Insights From Large-Scale Model Experiments

Three-Dimensional Analysis of Geogrid Reinforced Flexible Pavement Using Finite Difference Program Flac3d

Influence of geogrid arrangement on the bearing capacity of a granular soil on physical models and its comparison to theoretical equations

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