Abstract
This paper relates results of a large number of 3D numerical models of a single spread footing over a soil reinforced by four rigid inclusions and submitted to a large set of complex loading. This numerical study using the FLAC 3D software was done under funding of the ASIRI research project in an aim to support appropriate guidelines for design of such foundations. From these models a database of displacements and stresses in any 4 piles was built. An alternate simplified approach is also described using tools commonly used for pile foundation design. All results are found to be in fair agreement. This gives credit to the use of the simplified approach for design of this kind of foundation.
Highlights
Soil reinforcement by rigid inclusions has proved to be an efficient foundation solution for ground slabs of industrial facilities
The simplified method is composed of two successive additional steps (Simon, 2010). Both make use of an ordinary tool for pile foundation design, i.e., study of an isolated pile bearing on elastic-plastic springs (p = p(y) < plim).and subjected to transverse loading, as depicted by force T and bending moment M applied at the head and/or a displacement imposed on the surrounding soil g(z)
Flac 3D numerical modelling of a single spread footing on soft soil which is reinforced by four rigid inclusions has been carried out for a comprehensive range of loading conditions as for load intensity or inclination
Summary
Soil reinforcement by rigid inclusions has proved to be an efficient foundation solution for ground slabs of industrial facilities. The load-displacement curve of an inclusion assumed to be isolated (including the granular pad prism displaying the same cross-section as inclusion) in a soil block subjected to an imposed settlement profile as calculated in step 2 makes it possible to establish the load value to apply at the head of this column in order to obtain the same settlement as previously calculated at top of the model.
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