The Use of Polyurethane Injection as a Geotechnical Seismic Isolation Method in Large-Scale Applications: A Numerical Study

Gatto, Michele Placido Antonio; Lentini, Valentina; Castelli, Francesco; Montrasio, Lorella; Grassi, Davide

doi:10.3390/geosciences11050201

Cited by 23 publications

(13 citation statements)

References 48 publications

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“…The values of Gmax and Dmin obtained by RC tests are plotted versus ρPUR for cell pressures equal to 100 (Figure 6a), 200 (Figure 6b) and 300 kPa (Figure 6c): it is observed that the points can be interpolated by straight lines passing through the origin. In particular, for Gmax, the coefficient of determination R 2 is high (greater than 0.96) and the linear trend is in good agreement with previous literature results (Gatto et al 2021b); for Dmin, the R 2 value is lower but the linear approximation is accepted because describing the dissipative behaviour is complicated even in the most well-known materials. According to experimental results, the dependence of Gmax and Dmin on ρPUR and p'c can be expressed by means of two following relations:…”

Section: Prediction Of the G/gmax-γc And D-γc Curves For Pure Polyure...supporting

confidence: 89%

Experimental and Numerical Analysis of the Polyurethane Foam Effects on Geotechnical Seismic Isolation

Gatto

Lentini

Montrasio

2021

Preprint

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The paper focuses on the detailed analysis of the dynamic characterisation of polyurethane to evaluate the effects of polyurethane injections into the soil with the aim of geotechnical seismic isolation (GSI). To determine the dynamic properties, resonant column (RC) tests were performed at the University Kore of Enna (Italy) on specimens of pure polyurethane (PUR) with different values of density and subjected to different mean confining pressures. The results obtained by means of RC tests, in terms of shear modulus G and the damping ratio D as a function of shear strain γc, allowed to develop an analytical formulation for G- γc and D- γc curves, taking into account the linear relationship with density of both the maximum value of shear modulus Gmax and the minimum value of damping ratio Dmin. The analytical formulation derived from the experimental results is applied for ground response seismic analyses of cohesive soils injected with polyurethane, using a finite element code. The numerical results show that the polyurethane injections reduce the value of maximum acceleration at ground surface and the reduction ranges with the thickness of the soil involved by polyurethane injection.

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Section: Prediction Of the G/gmax-γc And D-γc Curves For Pure Polyure...supporting

confidence: 89%

Experimental and Numerical Analysis of the Polyurethane Foam Effects on Geotechnical Seismic Isolation

Gatto

Lentini

Montrasio

2021

Preprint

Self Cite

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“…However, with the evolution of technology, alternative solutions have emerged that can be fully assimilated to ground monitoring generally quantified through the expected peak ground acceleration and the spectral accelerations [29]. Among the alternative methods for the protection of buildings against earthquakes, we can find the geotechnical seismic isolation [30,31]. Additionally, GPS/GNSS (global navigation satellite system) positioning is a commonly used method for measuring deformation [32,33].…”

Section: Introductionmentioning

confidence: 99%

Signals of Surface Deformation Areas in Central Chile, Related to Seismic Activity—Using the Persistent Scatterer Method and GIS

et al. 2022

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Interferometric synthetic aperture radar is an effective means of measuring changes in the altitude of the Earth’s surface. In this research, the areas of surface deformation associated with low- and medium-intensity seismic events in Central Chile were analyzed using SENTINEL 1 satellite radar interferograms and geographical information system (GIS) tools. The persistent scatterer method was used to reduce noise from conventional InSAR methods. The results revealed that the coastal zone of Central Chile has a high density of daily earthquakes with a prevalence (93.03%) of low- and medium-intensity earthquakes. Monthly deformation maps were developed for the coast of the Biobio region in Central Chile. A clear deformation pattern is defined along the coast, being greater in the Arauco, Lota and Lebu areas. It was also shown that there was a slight upward trend in the north and northeast zone (i.e., δup ~3 mm/year), while there was an obvious accentuated upward trend (i.e., δup ~24 mm/year) in the southern part. This movement increases as latitude increases. This pattern is related to the daily seismic activity, the product of the movement between plates, and the geological faults located in the area. The deformation and trend maps provide certainty in terms of where hotspots are located, e.g., the most hazardous areas in the study zone, which can be applied to urban planning and/or safety assessment.

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“…Depending on the type of structure, local soil type, local climate and expected future changes, the impact can be different in different scenarios. Many contemporary construction or ground improvement methods use temperature and moisture-sensitive materials [17][18][19][20] and these changes need to be carefully considered to avoid unexpected losses in efficiencies of these techniques. Climate change and its influence on soil behaviour have been an active area of research over the past two decades.…”

Section: Introductionmentioning

confidence: 99%

Changes in Thornthwaite Moisture Index and Reactive Soil Movements under Current and Future Climate Scenarios—A Case Study

et al. 2021

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Expansive soils go through significant volume changes due to seasonal moisture variations resulting in ground movements. The ground movement related problems are likely to worsen in the future due to climate change. It is important to understand and incorporate likely future changes in design to ensure the resilience of structures built on such soils. However, there has been a limited amount of work quantifying the effect of climate change on expansive soils movement and related behaviour of structures. The Thornthwaite Moisture Index (TMI) is one of the commonly used climate classifiers in quantifying the effect of atmospheric boundary on soil behaviour. Using the long-term weather data and predicted future changes under different emission scenarios, a series of TMI maps are developed for South Australia. Potential changes in ground movement are then estimated for a selected area using a simplified methodology where the effect of future climate is captured through changes in TMI. Results indicate that South Australia is likely to face a significant reduction in TMI under all emission scenarios considered in this study. The changes in TMI will lead to a considerable increase in potential ground movement which will influence the behaviour of structures built on them and in some areas may lead to premature failure if not considered in the design.

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The Use of Polyurethane Injection as a Geotechnical Seismic Isolation Method in Large-Scale Applications: A Numerical Study

Cited by 23 publications

References 48 publications

Experimental and Numerical Analysis of the Polyurethane Foam Effects on Geotechnical Seismic Isolation

Experimental and Numerical Analysis of the Polyurethane Foam Effects on Geotechnical Seismic Isolation

Signals of Surface Deformation Areas in Central Chile, Related to Seismic Activity—Using the Persistent Scatterer Method and GIS

Changes in Thornthwaite Moisture Index and Reactive Soil Movements under Current and Future Climate Scenarios—A Case Study

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