Assessment of the Efficiency of Consolidation Treatment through Injections of Expanding Resins by Geotechnical Tests and 3D Electrical Resistivity Tomography

Electrical resistivity surveys are commonly used to detect and characterise near-surface buried objects in commercial developments of brownfield sites. 2D ERT profiles arrays predominate in such surveys due to their relatively rapid deployment, good penetration depths and fast data collection rates. However, there is a need to test the optimum array types in such surveys. A scaled-model was used to simulate a large cleared-building wall foundation in gravel-fill at a test facility, before multiple 2D ERT profiles were acquired using different array configurations. Results were used to generate 2D resistivity models using both least-square smoothness-constraint and robust inversion. 2D profile array comparisons showed that the Wenner and dipole-dipole arrays were the best in detecting the cleared-wall foundation, although dipole-dipole arrays better delineated the top of the wall foundation. This study suggests that both Wenner and dipole-dipole array configurations should be utilised to detect buried wall foundations for 2D resistivity surveys.

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“…Cardarelli et al 2007;Arjwech et al 2013), or to monitor ground stabilisation procedures (e.g. Fischanger et al 2013;Apuani et al 2015).…”

mentioning

confidence: 99%

Electrical resistivity tomography array comparisons to detect cleared-wall foundations in brownfield sites

Eissa

Cassidy

Pringle

et al. 2019

QJEGH

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“…When the initial lifting is observed, it means that the consolidating action is being directed vertically upward and that this is the direction that offers the least resistance, while the surrounding soil offers greater resistance in respect of the decrease in the structural load. This shows that the foundation soil has been compacted enough to withstand not only the increase of static loads, but also the loads developed as a result of the lifting [16].…”

Section: Discussionmentioning

confidence: 92%

“…The principle of the technology is based on the injection of a certain volume of expanding polyurethane resin into the soil, below the foundation bearing surface which then expands, displacing the soil around the injection site [15,16]. The expansion is accompanied by a reduction in swelling pressure and an increase in the average confining stress.…”

Section: Discussionmentioning

confidence: 99%

Chemical Injections Realized with Null Pressure for Underpinning the Foundation of an 18th Century Building Located in the Historical City of Cuenca (Spain)

2018

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The injection of expanding polyurethane resin into the soil is a well-known technology, which every time more often is used in interventions for reinforcing shallow foundations. It is noteworthy that it is a non-destructive technology, which generated small disturbance in the structure, and that is why is very appreciate for sensitive buildings as those belonging to the country's architectural heritage.

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“…At that point, the only possibility for expansion is an upward displacement of the soil ( Figure 5). When this initial lifting is observed, it means that the consolidating action is being directed vertically upward and that this is the direction that offers the least resistance, while the surrounding soil offers greater resistance in respect of the decrease in the structural load, which means that the foundation soil has been compacted enough to withstand not only the increase in static loads, but also the loads created by the lifting (Bilotta, 2013) (Apuani et al, 2015) (Buzzi, O., Fityus, S., Sasaki, Y., & Sloan, 2008)(VINSON & Mitchell, 1972.…”

Section: Injection Proceduresmentioning

confidence: 99%

Underpinning of shallow foundations by expansive polyurethane resin injections. Case study: Cardinal Diego de Espinosa Palace in Segovia (Spain)

Sánchez

Serna

Lavín

et al. 2017

rdlc

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The injection of expansive polyurethane resin into the soil is a technology that is beginning to be used for underpinning shallow foundations. It is noteworthy that this technology has been used on buildings of great historical value which are part of the country's architectural heritage. This article describes the work done on the Cardinal Diego de Espinosa Palace which consisted of injecting expanding polyurethane resin into the soil at different depths (Uretek Deep Injections) in order to mitigate the differential settlements detected in the structure. This injection technology has proven to be more effective than the more convention methods used in the past which consisted of raising the foundation by building concrete shafts, which did not manage to mitigate the causes of the pathologies observed in the palace.Key words: Underpinning, Injection, Expansive Resins, Historical buildings. ResumenLa inyección en el terreno de resina de poliuretano expansivo es una tecnología que se está comenzando a utilizar en el recalce de las cimentaciones superficiales. En este sentido, resulta más enriquecedor llamar la atención sobre aquellas actuaciones realizadas que, por ser edificaciones con un valor histórico relevante, forman parte del patrimonio arquitectónico de un país. El presente artículo describe la actuación realizada en el edificio histórico del Palacio del Cardenal Diego de Espinosa, consistente en la inyección de resina de poliuretano expansivo en el terreno a diferentes profundidades (Uretek Deep Injections), encaminada a mitigar la presencia de asientos diferenciales detectados en su estructura. Esta tecnología de inyección ha mostrado ser más efectiva que las anteriores actuaciones de recalce convencionales realizadas, recrecidos de la cimentación mediante la construcción de pozos de hormigón, en las que no se consiguieron mitigar las causas de las patologías observadas en el palacio.

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Assessment of the Efficiency of Consolidation Treatment through Injections of Expanding Resins by Geotechnical Tests and 3D Electrical Resistivity Tomography

Cited by 13 publications

References 12 publications

Electrical resistivity tomography array comparisons to detect cleared-wall foundations in brownfield sites

Electrical resistivity tomography array comparisons to detect cleared-wall foundations in brownfield sites

Chemical Injections Realized with Null Pressure for Underpinning the Foundation of an 18th Century Building Located in the Historical City of Cuenca (Spain)

Underpinning of shallow foundations by expansive polyurethane resin injections. Case study: Cardinal Diego de Espinosa Palace in Segovia (Spain)

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