Experimental evaluation of geocell-reinforced bases under repeated loading

Pokharel, Sanat K.; Han, Jie; Leshchinsky, Dov; Parsons, Robert L.

doi:10.1016/j.ijprt.2017.03.007

Cited by 68 publications

(43 citation statements)

References 13 publications

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“…The maximum RDR was achieved for geocell with a basal geogrid reinforced subgrade. Pokharel et al (2018) defined traffic benefit ratio (TBR) as the ratio of the number of cycles necessary to reach a given rut depth. It is useful for quantifying the benefit of extended pavement life or reduced thickness of pavement.…”

Section: Resultsmentioning

confidence: 99%

“…The free vibration tests showed that the natural frequency and damping properties were improved for reinforced sand. Pokharel et al (2018) conducted repeated loading tests on reinforced bases with "Novel Polymeric Alloy" geocell filled using poorly graded river sand and quarry waste. The improvement in the working life of pavement was quantified with the help of the traffic benefit ratio.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Geosynthetics Reinforced Subgrade Subjected to Repeated Vehicle Loads: Experimental and Numerical Studies

Hegde

Palsule

2020

Front. Built Environ.

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Use of the geosynthetics to strengthen the soil is one of the highly desirable techniques under static and dynamic loads. The present study describes the experimental and numerical studies performed on the geosynthetic reinforced subgrade subjected to repeated vehicle loads. The cyclic plate load tests were conducted on the sand subgrade reinforced with planar and 3D geosynthetic reinforcements. The vehicle load was simulated by applying a repeated load of magnitude 275 kPa with 1 Hz frequency on the reinforced subgrade. Results of the experimental investigations revealed that the performance of the subgrade soil improved significantly in the presence of reinforcements. The estimated parameters illustrated the three-fold reduction in settlement of the subgrade in the presence of reinforcement. Further, the heaving of the subgrade soil was found completely arrested with the use of geosynthetic reinforcement. The three-dimensional geocell reinforcement performed effectively as compared to planar geogrids under dynamic load. The measured pressure values at different depth demonstrated a significant reduction in the pressure in the presence of reinforcements. Besides, numerical simulations were performed using PLAXIS 2D to understand pressure and settlement distribution patterns in the reinforced subgrade. In overall, a good agreement was observed between numerical and experimental results.Abbreviations: B, width of geocell mattress (mm); C, cohesion of unreinforced sand (kPa); C c , coefficient of curvature (dimensionless); C r , increased apparent cohesion (kPa); C u , uniformity coefficient (dimensionless); C , total apparent cohesion (kPa); d 0 , equivalent geocell pocket diameter (mm); D, width of loading plate (mm); D 10 , effective particle size (mm); δ, soil surface settlement (mm); e min , minimum void ratio (dimensionless); e max , maximum void ratio (dimensionless); E, young's modulus of elasticity (kPa); ε a , axial strain (dimensionless); G, shear modulus (kPa); G s , specific gravity of sand (dimensionless); γ d , dry unit weight (kN/m 3 ); h, height of geocell (mm); H, height of sand bed (mm); k p , coefficient of passive earth pressure (dimensionless); M, secant modulus of geocell material (kPa); N r , number of loading cycles for reinforced case (dimensionless); N u , number of loading cycles for unreinforced case (dimensionless); r, radial distance from the center of loading plate (mm); S 0 , settlement of unreinforced subgrade (mm); S r , settlement of reinforced subgrade (mm); σ n , horizontal stress increment (kPa); σ ' yy , vertical effective stress (kPa); w, specific weight (kN/m/m); W, width of the sand bed (mm); µ, poisson's ratio (dimensionless); z, depth of geocell (mm); α/β, rayleigh damping parameters (dimensionless); φ, angle of internal friction (degrees); ψ, dilatancy angle (degrees).Frontiers in Built Environment | www.frontiersin.org 1 February 2020 | Volume 6 | Article 15

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of Geosynthetics Reinforced Subgrade Subjected to Repeated Vehicle Loads: Experimental and Numerical Studies

Hegde

Palsule

2020

Front. Built Environ.

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“…It is important to consider the effect that occurs in the geocells of Neoloy® from exposure to the environment (Figure 7), since these demonstrate the best behavior against long-term deformation [11][12][13][14][15].…”

Section: Resultsmentioning

confidence: 99%

Analysis of the Creep and the Influence on the Modulus Improvement Factor (MIF) in Polyolefin Geocells Using the Stepped Isothermal Method

Ruge¹,

Gomez²,

Moreno³

2020

Geopolymers and Other Geosynthetics

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The article shows the analysis of the behavior at long-term deformation of geocells for a set time period, due to its importance on the modulus improvement factor (MIF), which is considered in the design stage of a reinforced pavement structure with geocells. When inquiring into the research about the structural behavior that exists in the geocells, as well as the distribution of stresses that this generates, in order to determine how important the existence of a deformation in the geocell is. We proceeded with the sampling and execution of the test "modified stepped isothermal method (SIM) for geocells." The test was carried out under the comparison of the materials and thicknesses of the sample, with the purpose to analyze the influence on the behavior of a pavement structure. The stresses generated at the level of the granular subbase layer of a pavement are taken into account as load effects.

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“…Falling Weight Deflectometer (FWD) is an impulseloading device in which a transient load is applied to the pavement and the deflected shape of the pavement surface is measured. A falling weight deflectometer (FWD) is a testing device to evaluate the physical properties of pavement [10][11][12][13]. FWD data is primarily used to estimate pavement structural capacity for overlay design also falling weight deflectometer (FWD) enables researchers to perform nondestructive, quick, and dynamic evaluations of paved surfaces, aggregate sub-bases, and soil subgrades without leaving the testing vehicle.…”

Section: Methodsmentioning

confidence: 99%

Falling Weight Deflectometer Analysis of Low Volume Roads

Harle¹,

Pajgade²

2019

JCCEE

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The work was carried out on the village roads where the traffic intensity is very low. The roads should be constructed as durable and with minimum construction cost without affecting the strength. Therefore the experiments were carried out on different types of roads. The experiments can be performed in the laboratory but that is not sufficient and therefore the tests should also be performed on the actual constructed pavement patches. The non destructive test is the best way to check the parameters responsible for the effectiveness of pavement. The non destructive testing machines like ground penetrating radar (GPR) and falling weight deflectometer is used to assess different parameters of pavements. The subgrade moduli is also compared with the help of these machines. The falling weight deflectometer (FWD) was carried out on the plastic cell filled concrete block pavement (PCCBP), Geocell filled concrete concrete block pavement (GCCBP) and grouted macadam (GM). The deflection, modulus of elasticity, strain, thickness calculation, area, RRS were calculated through this test by the back calculation. From this observation it is found that the geocell filled concrete block pavement performed well as compared to the other pavements in terms of the calculated parameter. The deflection was more in the grouted macadam when compared with the PCCBP and GCCBP.

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Experimental evaluation of geocell-reinforced bases under repeated loading

Cited by 68 publications

References 13 publications

Performance of Geosynthetics Reinforced Subgrade Subjected to Repeated Vehicle Loads: Experimental and Numerical Studies

Performance of Geosynthetics Reinforced Subgrade Subjected to Repeated Vehicle Loads: Experimental and Numerical Studies

Analysis of the Creep and the Influence on the Modulus Improvement Factor (MIF) in Polyolefin Geocells Using the Stepped Isothermal Method

Falling Weight Deflectometer Analysis of Low Volume Roads

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