Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Stabilization methodology in foundation soils by ERT-3D. Application in Estepona, South Spain.

Version 1 : Received: 13 April 2021 / Approved: 15 April 2021 / Online: 15 April 2021 (10:50:51 CEST)

How to cite: Gutiérrez-Martín, A.; Yenes, J.I.; Fernández-Hernández, M.; Castedo, R. Stabilization methodology in foundation soils by ERT-3D. Application in Estepona, South Spain.. Preprints 2021, 2021040406 (doi: 10.20944/preprints202104.0406.v1). Gutiérrez-Martín, A.; Yenes, J.I.; Fernández-Hernández, M.; Castedo, R. Stabilization methodology in foundation soils by ERT-3D. Application in Estepona, South Spain.. Preprints 2021, 2021040406 (doi: 10.20944/preprints202104.0406.v1).

Abstract

The paper proposes a novel methodology for the stabilization of shallow foundations, with a simplified model combined with 3D Electrical resistivity tomography (ERT-3D) and conso- lidation injections. To determine its usefulness, the method has been applied in a case located in Estepona (southern Spain). The chosen tomography model is the dipole-dipole configuration, with an optimized distance between electrodes of 0.80 m for a better visualization of the foundation subsoil; with this parameterization, a total of 72 electrodes were installed in the analyzed case. In this work, the depth of the anomaly in the building's supporting subsoil was detected ranging from 2.00 m to 3.90 m deep. The study also delineates areas of high resistivity variations (50-1,000 Ω m) in the middle and eastern end of the field. These data have been validated and corroborated with a field campaign. The results of the ERT-3D monitoring are presented, once the investment data has been processed with the RES3DINV software, from the beginning to the end of the stabilization intervention. The novelty occurs with the interaction between the tomography and the foundation consolidation injections, until the final stabilization; very useful methodology in case of emergency consolidation, where there is a need to minimize damage to the building. Thus, people using this combined system; will be able to practically solve the initial anomalies of the subsoil that caused the damages, in a non-invasive way, considerably lowering the value of the resistivities.

Subject Areas

Electric tomography; three-dimensional; electrodes; seat control; foundations; stabilization methodology.

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