Behavior of Shallow Strip Footing on Twin Voids

This paper numerically examines the bearing capacity and failure mechanism of a shallow strip foundation constructed above twin voids. The voids may refer to caves, caverns, underground aqueduct or tunnels due to water seepage, chemical reaction or deliberately excavated in soil deposit. The ability...

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Bibliographic Details
Published in:Geotechnical and geological engineering 2016-12, Vol.34 (6), p.1791-1805
Main Authors: Lavasan, Arash Alimardani, Talsaz, Ali, Ghazavi, Mahmoud, Schanz, Tom
Format: Article
Language:English
Subjects:
Bearing capacity
Caverns
Caves
Chemical reactions
Civil Engineering
Collapse
Critical depth
Earth and Environmental Science
Earth Sciences
Exact solutions
Failure mechanisms
Footings
Foundation construction
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Mathematical models
Organic chemistry
Original Paper
Seepage
Shallow foundations
Shear strain
Soil
Strip
Submarine springs
Terrestrial Pollution
Tunnels
Underground caverns
Voids
Waste Management/Waste Technology
Water seepage
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Summary:This paper numerically examines the bearing capacity and failure mechanism of a shallow strip foundation constructed above twin voids. The voids may refer to caves, caverns, underground aqueduct or tunnels due to water seepage, chemical reaction or deliberately excavated in soil deposit. The ability of numerical model to accurately predict the system behavior is evaluated by performing verification analyses on existing researches. Subsequently, a parametric study carried out to reveal the influence of size of footing/voids and their location (i.e. depth, spacing, eccentricity) on the bearing capacity of footing. To clarify the failure mechanism, the distribution of shear strain in the soil for different scenarios is assessed. The parametric study provided a new framework to determine the bearing capacity and the mode of failure for footings on voids. Based on the results, a criterion can be issued to avoid collapse of footing/voids regarding the shape, location and size of voids. The results can also be used to design construction of a footing on existing voids while the acquired failure mechanisms can be appointed to develop analytical solutions for this problem. Results demonstrated that a critical depth for voids and a critical distance between them exist where the influence on the ultimate bearing capacity of footing disappears.
ISSN:0960-3182
1573-1529
DOI:10.1007/s10706-016-9989-6