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

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

Studia Geotechnica et Mechanica
Volume 42 (2020): Issue 3 (September 2020)
By: Djamel Saadi,  Khelifa Abbeche and  Rafik Boufarh  
Open Access
|Jun 2020

Figures & Tables

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
DOI: https://doi.org/10.2478/sgem-2019-0046 | Journal eISSN: 2083-831X | Journal ISSN: 0137-6365
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Language: English
Page range: 222 - 231
Submitted on: Oct 4, 2019
Accepted on: Apr 16, 2020
Published on: Jun 13, 2020
Published by: Wroclaw University of Science and Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
Bearing capacity,
shallow foundations,
cavities,
interference effect,
model test,
granular soil
Related subjects:
Geosciences,
Geosciences, other,
Materials sciences,
Composites,
Porous materials,
Physics,
Mechanics and fluid dynamics

© 2020 Djamel Saadi, Khelifa Abbeche, Rafik Boufarh, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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