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Model experiments to assess effect of cavities on bearing capacity of two interfering superficial foundations resting on granular soil

Djamel Saadi

Djamel Saadi

Research laboratory in hydraulic applied LARHA, Department of Civil Engineering, Faculty of Technology, University of Batna 2Batna, Algeria
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Saadi, Djamel
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Khelifa Abbeche

Khelifa Abbeche

Research laboratory in hydraulic applied LARHA, Department of Civil Engineering, Faculty of Technology, University of Batna 2Batna, Algeria
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Abbeche, Khelifa
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Rafik Boufarh

Rafik Boufarh

Department of Civil Engineering, Faculty of Sciences and Technology, Larbi Tebessi UniversityTebessa, Algeria
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Boufarh, Rafik
  
13 jun 2020
Model experiments to assess effect of cavities on bearing capacity of two interfering superficial foundations resting on granular soil's Cover Image
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Categoría del artículo: Research Article
Publicado en línea: 13 jun 2020
Páginas: 222 - 231
Recibido: 04 oct 2019
Aceptado: 16 abr 2020
DOI: https://doi.org/10.2478/sgem-2019-0046
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© 2020 Djamel Saadi et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Schematic diagram of test setup: 1) steel test box; 2) steel load frame; 3) hydraulic jack; 4) proving ring; 5) dial gauge; 6) steel beam; 7) model steel footing; 8) cavities (PVC 110 mm); 9) roller compactor.
Schematic diagram of test setup: 1) steel test box; 2) steel load frame; 3) hydraulic jack; 4) proving ring; 5) dial gauge; 6) steel beam; 7) model steel footing; 8) cavities (PVC 110 mm); 9) roller compactor.

Figure 2

Models used in this study: (a) isolated footing; (b) two adjacent strip footings; (c) isolated footing with cavity; (d) two adjacent strip footings with cavity; (e) isolated footing with two cavities; (f) two adjacent strip footings with two cavities
Models used in this study: (a) isolated footing; (b) two adjacent strip footings; (c) isolated footing with cavity; (d) two adjacent strip footings with cavity; (e) isolated footing with two cavities; (f) two adjacent strip footings with two cavities

Figure 3

Interpretation of ultimate bearing capacity (qu) by Tangent Intersection Method.
Interpretation of ultimate bearing capacity (qu) by Tangent Intersection Method.

Figure 4

Load-settlement curve for cases of isolated footing and two strip footings; both cases rest on the surface of a sand layer without cavities.
Load-settlement curve for cases of isolated footing and two strip footings; both cases rest on the surface of a sand layer without cavities.

Figure 5

Load-settlement curve of isolated footing without cavity, isolated footing with cavity (H/B = 1), and isolated footing with two cavities (H/B = 1 and L/B = 1).
Load-settlement curve of isolated footing without cavity, isolated footing with cavity (H/B = 1), and isolated footing with two cavities (H/B = 1 and L/B = 1).

Figure 6

Load-settlement curve of adjacent footings without cavity and case of adjacent footings with cavity (H/B = 1).
Load-settlement curve of adjacent footings without cavity and case of adjacent footings with cavity (H/B = 1).

Figure 7

Load-settlement curve of adjacent footings without cavity and case of adjacent footings with two cavities (H/B = 1 and L/B = 1).
Load-settlement curve of adjacent footings without cavity and case of adjacent footings with two cavities (H/B = 1 and L/B = 1).

Figure 8

Comparison of EF values of strip footing without cavities with values reported in literature.
Comparison of EF values of strip footing without cavities with values reported in literature.

Figure 9

Variation of EF as a function of x/B in the following cases: two strip footings without cavity and with cavity (H/B = 1; H/B = 2 and H/B = 3).
Variation of EF as a function of x/B in the following cases: two strip footings without cavity and with cavity (H/B = 1; H/B = 2 and H/B = 3).

Figure 10

Variation of EF as a function of x/B in the following cases: two strip footings without cavities and with cavity (H/B = 3); (L/B = 1.0, L/B = 1.5, L/B = 2.0, L/B = 3.0, L/B = 4.0, and L/B = 5.0)
Variation of EF as a function of x/B in the following cases: two strip footings without cavities and with cavity (H/B = 3); (L/B = 1.0, L/B = 1.5, L/B = 2.0, L/B = 3.0, L/B = 4.0, and L/B = 5.0)

Figure 11

Variation of EF as a function of x/B in the following cases: two strip footings without cavity and with cavity (H/B = 2); (L/B = 1.0, L/B = 1.5, L/B = 2.0, L/B = 3.0, L/B = 4.0, L/B = 5.0).
Variation of EF as a function of x/B in the following cases: two strip footings without cavity and with cavity (H/B = 2); (L/B = 1.0, L/B = 1.5, L/B = 2.0, L/B = 3.0, L/B = 4.0, L/B = 5.0).

Figure 12

Variation of EF as a function of x/B in the following cases: two strip footings without cavity and with cavity (H/B = 1); (L/B = 1.0, L/B = 1.5, L/B = 2.0, L/B = 3.0, L/B = 4.0, and L/B = 5.0).
Variation of EF as a function of x/B in the following cases: two strip footings without cavity and with cavity (H/B = 1); (L/B = 1.0, L/B = 1.5, L/B = 2.0, L/B = 3.0, L/B = 4.0, and L/B = 5.0).

Model tests program_

Test seriesx/BH/BL/B
Without cavity1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0//
With Cavity1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.00.5, 1.0, 1.5, 2.0, 2.5, 3.0/
with two cavities1.0, 1.5, 2.0, 2.5, 3.0, 4.0, 5.00.5, 1.0, 1.5, 2.0, 2.5, 3.00.5, 1.0, 1.5, 2.0, 3.0, 4.0, 5.0

Geotechnical properties of the tested sand_

PropertyValue
Specific gravity Gs2.583
Effective particle size D10, mm0.094
Mean particle size D30, mm0.200
Mean particle size D60, mm0.300
Uniformity coefficient Cu3.19
Coefficient of curvature Cc1.42
Maximum dry unit weight γd(max), KN/m317.02
Minimum dry unit weight γd(min), KN/m314.51
Peak friction angle φ035
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Geociencias, Geociencias, otros, Ciencia de los materiales, Compuestos, Materiales porosos, Física, Mecánica y dinámica de fluidos
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