Effect of the interfacial shearing stress of soil–geogrid interaction on the bearing capacity of geogrid-reinforced sand

A ring footing is found to be of practical importance in supporting symmetrical constructions for example silos, oil storage container etc. In the present paper, numerical analysis was carried out with explicit code FLAC3D 7.0 to investigate bearing capacity of a ring footing on geogrid reinforced sand. Effects of the ratio n of its inner/outer diameter (Di/D) of a ring footing, an optimum depth to lay the geogrid layer were examined. It was found that an intersection zone was developed in soil under inner-side (aisle) of ring footing, contributing to its bearing capacity. Substantial increase of bearing capacities could be realized if ratio n of a ring footing was around 0.6. Numerical results also showed that, bearing capacity of a ring footing could increase significantly if a single-layer geogrid was laid at a proper depth under the footing. Similar contribution was found if a double-layer geogrid was implemented. However, such increases appeared to be rather limited if a triple-layer geogrid or a four-layer geogrid was used. A double-layer geogrid was recommended to increase the bearing capacity of a ring footing; the depth to lay this double-layer geogrid was also discussed.

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Directional Confinement Effect of Geogrid on Deformation and Bearing Capacity of Reinforced Sand under Cyclic and Monotonic Loadings

Geosynthetics Engineering Journal ◽

10.5030/jcigsjournal.31.45 ◽

2016 ◽

Vol 31 (0) ◽

pp. 45

Author(s):

AUNG AUNG SOE ◽

Jiro KUWANO ◽

Shinya TACHIBANA ◽

Ilyas AKRAM

Keyword(s):

Bearing Capacity ◽

Confinement Effect ◽

Reinforced Sand

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Behaviour of eccentrically inclined loaded rectangular foundation on reinforced sand

Studia Geotechnica et Mechanica ◽

10.2478/sgem-2021-0003 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Sujata Gupta ◽

Anupam Mital

Keyword(s):

Bearing Capacity ◽

Loading Conditions ◽

Test Results ◽

Bearing Capacity Ratio ◽

Reinforced Sand ◽

The Core ◽

Capacity Ratio ◽

Core Boundary ◽

Rectangular Foundation ◽

Increasing Load

Abstract This study presents the behaviour of model footing resting over unreinforced and reinforced sand bed under different loading conditions carried out experimentally. The parameters investigated in this study includes the number of reinforced layers (N = 0, 1, 2, 3, 4), embedment ratio (Df /B = 0, 0.5, 1.0), eccentric and inclined ratio (e/L, e/B = 0, 0.05, 0.10, 0.15) and (a = 0°, 7°, 14°). The test sand was reinforced with bi-axial geogrid (Bx20/20). The test results show that the ultimate bearing capacities decrease with axial eccentricity and inclination of applied loads. The test results also show that the depth of model footing increase zero to B (B = width of model footing), an increase of ultimate bearing capacity (UBC) approximated at 93%. Similarly, the multi-layered geogrid reinforced sand (N = 0 to 4) increases the UBC by about 75%. The bearing capacity ratio (BCR) of the model footing increases with an increasing load eccentricity to the core boundary of footing; if the load eccentricities increase continuity, the BCR decreases. The tilt of the model footing is increased by increasing the eccentricity and decreases with increasing the number of reinforcing layers.

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