Investigation of load transfer mechanisms in granular platforms reinforced by geosynthetics above cavities

Pham, Minh-Tuan; Briançon, Laurent; Dias, Daniel; Abdelouhab, Abdelkader

doi:10.1016/j.geotexmem.2018.04.015

Cited by 21 publications

(5 citation statements)

References 20 publications

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“…The literature proposes various different design methods, the majority of which consider the soil to be granular soil. They are considered as relatively pertinent methods to estimate the surface subsidence and to enable the GSY reinforcement to be designed (Giroud et al 1995, British Standard BS 8006 (2010Hassoun et al 2018;Feng et al 2017;Pham et al 2018). Giroud et al (1995) first suggested using of an equilibrium method based on the Terzaghi (1943) approach to estimate the amount of vertical load acting on the GSY.…”

Section: Design Methods For Gsy Reinforcementmentioning

confidence: 99%

Predicting subsidence of cohesive and granular soil layers reinforced by geosynthetic

Heib¹,

Hassoun

Emeriault

et al. 2021

Environ Earth Sci

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Subsidence can result from the collapse of underground cavities. The impact of such subsidence on existing structures and infrastructures is generally dramatic. Geosynthetic reinforcement (GSY) is an attractive mitigation solution that can be used to reduce this impact. This paper focuses on the mitigation solutions over existing cavities mainly on the GSY mitigation method. A large-scale physical model (1-g) is used to study the subsidence mechanisms and to estimate the efficacy of GSY for both cohesive and granular overlying soils. The results show that the presence of GSY reduces the ground movement due to the cavity progress toward surface, even under significant overload (traffic, localised foundation, etc.). The deformation of the GSY and the scenario for ground surface movement (subsidence or sinkhole) depend on both the soil type and overload intensity. The experimental results are compared to the analytical solutions proposed in order to design the GSY for cohesive and granular soils. In particular, the influence of the vertical stress distribution acting on the GSY is investigated.Different geometries of stress distribution are proposed for granular soils as a function of the loading mode (self-weight or localised overload). For cohesive soils, the action of the collapsed soil on the GSY sheet is found to be well estimated by considering the effect of a simplified system composed of two well localised punctual forces. The analytical and experimental results obtained are rather similar, proving the relevance of the analytical models in predicting the behaviour of reinforced soil layers taking into consideration the real stress distribution deduced from the experimental results.

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Section: Design Methods For Gsy Reinforcementmentioning

confidence: 99%

Predicting subsidence of cohesive and granular soil layers reinforced by geosynthetic

Heib¹,

Hassoun

Emeriault

et al. 2021

Environ Earth Sci

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“…The similar issues related to the effectiveness assessment of the use of geosynthetics in continuous deformation areas are the subject of [27][28], and [29] concerns the discontinuous deformation areas.…”

Section: Laboratory Research Of the Impact Of The Subgrade Strains On...mentioning

confidence: 99%

Archives of Mining Sciences

Zięba,

Kalisz,

Grygierek

2020

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In this article, the issue of mining impact on road pavements and subgrade is presented, taking into account the interaction between geosynthetic reinforcement and unbound aggregate layers. Underground mining extraction causes continuous and discontinuous deformations of the pavement subgrade. Structural deformations in the form of ruts are associated with the compaction of granular layers under cyclic loading induced by heavy vehicles. Horizontal tensile strains cause the loosening of the subgrade and base layers. The granular layers under cyclic loading are additionally compacted and the depth of ruts increases. Moreover, tensile strains can cause discontinuous deformations that affect the pavement in the form of cracks and crevices. Discontinuous deformations also affect the pavement in the fault zones during the impact of mining extraction. The use of geosynthetic reinforcement enables the mitigation of the adverse effects of horizontal tensile strains. Horizontal compressive strains can cause surface wrinkling and bumps. Subsidence causes significant changes in the longitudinal and transverse inclination of road surface. Both examples of the laboratory test results of the impact of subgrade horizontal strains on reinforced aggregate layers and the selected example of the impact of mining deformation on road subgrade are presented in this article. The examples show the beneficial impact of the use of geosynthetic reinforcement to stabilize unbound aggregate layers in mining areas.

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“…The arching effect in some practical situations such as tunnels and pile foundations, have also been brought into focus and modeled in the physical experiments [11,12,13,14,15]. Besides model experiments, advanced numerical simulation methods such as discrete element modeling are also used to examine the effect of soil arching under various conditions, including the trapdoor experiment, soilpile interaction, and tunnel settlement [16].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the fabric effect on the arching effect in granular materials

Deng,

Dai

2024

IOP Conf. Ser.: Earth Environ. Sci.

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A series of trapdoor experiments and DEM simulations were carried out in this study to examine the arching effect in granular materials, with the focus being on the influence of the direction for particle deposition. In the tests, particles (e.g. rice grains, PVC particles and nylon particles) were dropped as if they were raining at different directions to construct granular material layers with various fabric orientations. It is shown that the mobilization of arching effect depends on the direction of particle deposition, with the arching ratio ρ increasing at first and then decreasing. The arching effect is the weakest at a deposition angle of θ = 30° in obliquely deposited granular masses. It is also found that the vertical displacement of particles in the ultimate phase increases initially; it then decreases with the variation in the orientation of particle deposition, and the largest displacement occurs at θ = 30°.

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Investigation of load transfer mechanisms in granular platforms reinforced by geosynthetics above cavities

Cited by 21 publications

References 20 publications

Predicting subsidence of cohesive and granular soil layers reinforced by geosynthetic

Predicting subsidence of cohesive and granular soil layers reinforced by geosynthetic

Archives of Mining Sciences

Investigation of the fabric effect on the arching effect in granular materials

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