Coupled numerical and experimental analyses of load transfer mechanisms in granular-reinforced platform overlying cavities

Chalak, Caroline; Briançon, Laurent; Villard, Pascal

doi:10.1016/j.geotexmem.2019.04.003

Cited by 13 publications

(6 citation statements)

References 18 publications

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“…The necessity to take into account different shapes of stress distribution, depending on loading process or cavity opening mode, was mentioned in the literature by various authors (Villard et al, 2016;Chalak et al, 2019;da Silva Burke, 2020). As an example, the experimental results presented in this paper are in good accordance with the results presented by Villard and Briançon (2008) concerning the influence of the embankment overloading on the vertical stress distribution acting on the GSY.…”

Section: Granular Soil -Fontainebleau Sand (Sf)supporting

confidence: 82%

“…Depending on the opening mode of the cavity and the loading type, the geometries of the soil stress distribution acting on the GSY sheet can differ. In the case of the trapdoor problem (similar to the experiments presented in 3.2), the load distribution acting on the GSY sheet (Villard et al 2016, Hassoun et al 2018, Chalak et al 2019) was found to be non-uniform. The observed shape of an inverted triangular distribution leads to greater vertical stresses in the vicinity of the cavity edges.…”

Section: R J T Usupporting

confidence: 52%

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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: Granular Soil -Fontainebleau Sand (Sf)supporting

confidence: 82%

Section: R J T Usupporting

confidence: 52%

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 DEM geosynthetics piled embankment model was validated with the full-scale experiment (Le Villard, et al, 2016;Chalak, et al, 2019). It is not necessary to consider a numerical particles size equal to the experimental one.…”

Section: Dem Parameters For the Granular Materialsmentioning

confidence: 99%

Geosynthetic reinforced piled embankment modeling using discrete and continuum approaches

Tran

Villard

Dias

2021

Geotextiles and Geomembranes

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“…Piled embankments have been widely adopted to overcome intolerable total or differential settlements, large lateral displacements of highway, and railway engineering, especially for embankments constructed over soft soils [1][2][3][4][5][6][7][8][9]. Soil arching effect is a ubiquitous phenomenon occurred in the piled embankment to transfer the vertical stress from the relatively stiff pile to the softer soil due to the differential settlement [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Soil Arching of Piled Embankment in Equal Settlement Pattern: A Discrete Element Analysis

et al. 2021

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Soil arching, which occurs in the piled embankments, plays an important role in stress redistribution between the relatively soft subsoil and the stiffer piles. The formation of the soil arching depends on the differential settlement of the embankment fill above the pile and the subsoil. The soil arching effect is barely investigated in the literature from the perspective of differential settlement of piles and soils. Based on the discrete element method (DEM), this paper develops a classic trapdoor test model to investigate the differential settlement in piled embankment during the downward movement of the trapdoor, and to explore the formation mechanism of soil arching in equal settlement pattern by changing the width of the pile cap and the height of the embankment. Due to symmetry, only one section of the laboratory test model is simulated herein. It was found that the soil arching formed under the equal settlement pattern remained unchanged after a certain degree of development, and the height of the equal settlement did not change at 0.7(s-a), where s is the pile spacing, and a is the width of the pile cap. The height of the embankment (H) and the width of the pile cap (a) have a significant influence on the formation of the equal settlement pattern when the width of the trapdoor is kept constant. Both the decrease in “H” and the increase in “a” facilitate the differential settlement of the soil between the piles and the pile-soil, enabling the slip surface to develop upward gradually, thereby hindering the formation of the equal settlement pattern.

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Coupled numerical and experimental analyses of load transfer mechanisms in granular-reinforced platform overlying cavities

Cited by 13 publications

References 18 publications

Predicting subsidence of cohesive and granular soil layers reinforced by geosynthetic

Predicting subsidence of cohesive and granular soil layers reinforced by geosynthetic

Geosynthetic reinforced piled embankment modeling using discrete and continuum approaches

Soil Arching of Piled Embankment in Equal Settlement Pattern: A Discrete Element Analysis

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