Response of pavement foundations incorporating both geocells and expanded polystyrene (EPS) geofoam

Siabil, Seyed Mohammad Amin Ghotbi; Tafreshi, S.N. Moghaddas; Dawson, Andrew

doi:10.1016/j.geotexmem.2019.103499

Cited by 46 publications

(4 citation statements)

References 113 publications

(87 reference statements)

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“…The achieved density of the material was around 18.61 kN/m 3 (118.5 pcf), which is much lower than the MDD value owing to the dry condition. Previous studies have demonstrated that expanded polystyrene (EPS) geofoams can be used as a uniform subgrade material with relatively low strength [42,43]. Thus, a 15.2 cm (6-in.)…”

Section: Large-scale Testbed Equipped With Be Field Sensorsmentioning

confidence: 99%

Local Stiffness Assessment of Geogrid-Stabilized Unbound Aggregates in a Large-Scale Testbed

Kang,

Wang,

Qamhia

et al. 2023

Applied Sciences

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This paper integrates and extends an earlier article presented at the 20th International Conference on Soil Mechanics and Geotechnical Engineering. The generation of a stiffened zone in the proximity of a geogrid is one of the primary mechanisms of mechanical stabilization of pavement unbound aggregate layers using geogrids. This paper focuses on the quantification of the stiffened zone through a local stiffness assessment using bender element (BE) sensors. Unbound aggregate base layers were constructed in a large-scale laboratory testbed. Geogrid-stabilized layers had geogrids with different-sized triangular apertures contributing to the geogrid-stiffened zone. Shear wave velocities were measured at three different heights using BE sensors, and the vertical stiffness profiles of the mechanically stabilized aggregate layers were evaluated. In addition, the conversion method between small-strain stiffness and large-strain stiffness was established from the repeated load triaxial tests with BE pairs to transform the vertical stiffness profile into that of the resilient modulus. Furthermore, dynamic cone penetration (DCP) and light-weight deflectometer (LWD) tests were performed at multiple locations into the stabilized and unstabilized unbound aggregates. From the large-scale experimental study, the local stiffness improvement owing to the geogrid enhancement was up to 16.2% in the vicinity of the geogrid location, and the extent of the local stiffened zone evaluated through various test methods was between 15.2 cm (6 in.) and 25.4 cm (10 in.) above the geogrid.

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Section: Large-scale Testbed Equipped With Be Field Sensorsmentioning

confidence: 99%

Local Stiffness Assessment of Geogrid-Stabilized Unbound Aggregates in a Large-Scale Testbed

Kang,

Wang,

Qamhia

et al. 2023

Applied Sciences

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“…Han et al 25 and Latha and Somwanshi 24 adopted the diamond pattern to simulate the geocell shape. Further, Leshchinsky and Ling 26 , Biabani et al 27 , Ngo et al 28 , Siabil et al 29 used the square and hexagon pattern to calculate. The honeycomb shape (actual shape) was also adopted in recent years 17 , 19 , 30 .…”

Section: Introductionmentioning

confidence: 99%

Influence of different infill materials on the performance of geocell-reinforced cohesive soil beds

Zhao

Lü

Ji³

et al. 2023

Sci Rep

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This paper presents a comprehensive study on the numerical and parametric study of geocell-reinforced cohesive soil beds, focusing on different infill materials. The numerical calculations were validated against model test results using FLAC3D software. Subsequently, the verified model was expanded to the geocell-reinforced cohesive soil beds. Six cases were simulated to investigate the reinforced performance, including pressure-settlement responses, bearing capacity improvement factor, settlement reduction percentage, and surface deformation. The numerical findings emphasize that the significance of superior geocell reinforcement should not overshadow the consideration of soil infill’s mechanical properties. In the case of cohesive soil as the infill material, the poor improvement in geocell-reinforced performance may be attributed to its low modulus and cohesion. Parametric studies suggest that geocells significantly impact reinforced performance when the infill material consists of foundation soil with a higher modulus and lower cohesion. Further, according to this numerical study, cohesionless soil with a modulus of 20 MPa and friction of 40° is the optimum infill soil in pockets to reinforce cohesive soil beds.

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“…et al [25] and Siabil, S.M.A.G. et al [26] also conducted research on the interaction between soil and geocells with fruitful results. Based on existing mechanical models of and experience with geocells, the above research has explored the interaction and relationship between the geocell structure and soil layer.…”

Section: Introductionmentioning

confidence: 99%

Modeling Riverbank Slope Reinforcement Using Anti-Slide Piles with Geocells

Liu

Zhou

et al. 2021

JMSE

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Geocells are increasingly used in engineering applications, but the design of riverbank slope reinforcements that use only geocells limits reinforcement performance. Moreover, the design and use of anti-slide piles with geocells are mainly based on experiences that are unsupported by theoretical models. In this paper, by combining the confinement effect and vertical action mechanism of geocells, the horizontal friction mechanism of the geocell layer and the vertical support mechanism of piles, a theoretical model of riverbank slope reinforced by anti-slide piles with geocells was constructed. In addition, to describe the mechanical behavior of a riverbank slope reinforced by anti-slide piles with geocells, the slip-resisting mechanism of the anti-slide pile with interaction between geocells and their internal filler is considered in the model. Furthermore, to investigate the influence of changes in water level on riverbank slope stability, the developed model takes into account settlement, lateral displacement, pile bending moment and pile axial force. The model predications were validated by the field measurement data. The results from a series of parametric studies show that the use of anti-slide pile and geocells can effectively reduce the settlement and the lateral displacement of a riverbank slope. The developed model could contribute to an optimal design of anti-slide pile with geocells for enhancing the stability of a riverbank slope.

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Response of pavement foundations incorporating both geocells and expanded polystyrene (EPS) geofoam

Cited by 46 publications

References 113 publications

Local Stiffness Assessment of Geogrid-Stabilized Unbound Aggregates in a Large-Scale Testbed

Local Stiffness Assessment of Geogrid-Stabilized Unbound Aggregates in a Large-Scale Testbed

Influence of different infill materials on the performance of geocell-reinforced cohesive soil beds

Modeling Riverbank Slope Reinforcement Using Anti-Slide Piles with Geocells

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