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Mitigation of Liquefaction Risk by Innovative Ground Improvement Techniques
The reduction of soil susceptibility to earthquake-induced liquefaction is now considered a crucial issue in most of the seismic areas around the world, because it has been clearly seen that the damages on structures caused by the large reduction of effective stresses in the soil may overcome those induced by the inertial seismic forces. Several technologies have been studied over the years as countermeasures against liquefaction (e.g. densification and drainage, addition of plastic fine, cementation), but the most effective ones are usually not suited to be used in densely urbanized areas. Among the newly introduced mitigation technologies, induced partial saturation (IPS) is considered one of the most innovative and promising countermeasures, able to overcome this critical limitation. The goal of such a technique is to reduce the initial degree of saturation of the liquefiable soil just enough to reduce the pore pressure build up during the seismic shaking. Micro gas bubbles have to be generated into the water by air sparging (as done for environmental issues), or by environmentally friendly chemicals or even microorganisms that generate gas bubbles during their metabolism. Without entering into technological details, the lecture illustrates laboratory and in-situ experimental evidence of the extreme effectiveness of IPS, introducing a sound and simple design procedure to be used by practitioners.
Mitigation of Liquefaction Risk by Innovative Ground Improvement Techniques
The reduction of soil susceptibility to earthquake-induced liquefaction is now considered a crucial issue in most of the seismic areas around the world, because it has been clearly seen that the damages on structures caused by the large reduction of effective stresses in the soil may overcome those induced by the inertial seismic forces. Several technologies have been studied over the years as countermeasures against liquefaction (e.g. densification and drainage, addition of plastic fine, cementation), but the most effective ones are usually not suited to be used in densely urbanized areas. Among the newly introduced mitigation technologies, induced partial saturation (IPS) is considered one of the most innovative and promising countermeasures, able to overcome this critical limitation. The goal of such a technique is to reduce the initial degree of saturation of the liquefiable soil just enough to reduce the pore pressure build up during the seismic shaking. Micro gas bubbles have to be generated into the water by air sparging (as done for environmental issues), or by environmentally friendly chemicals or even microorganisms that generate gas bubbles during their metabolism. Without entering into technological details, the lecture illustrates laboratory and in-situ experimental evidence of the extreme effectiveness of IPS, introducing a sound and simple design procedure to be used by practitioners.
Mitigation of Liquefaction Risk by Innovative Ground Improvement Techniques
Indian Geotech J
Flora, Alessandro (author) / Lirer, Stefania (author) / Mele, Lucia (author)
Indian Geotechnical Journal ; 52 ; 1054-1064
2022-10-01
11 pages
Article (Journal)
Electronic Resource
English
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