likevektsledigheten

Likvefakteringsledigheten, often translated as liquefaction or flow liquefaction, is a phenomenon observed in saturated granular soils, such as sand and silt. It occurs when seismic shaking or other rapid loading causes a significant increase in pore water pressure. This increase in pressure reduces the effective stress between soil particles, causing the soil to lose its strength and behave like a liquid.

When a soil liquefies, it can no longer support structures built upon it. This can lead to severe consequences, including the settlement of buildings, tilting of foundations, and the lateral spreading of the ground. In some cases, the liquefied soil can also cause underground utilities, such as pipes and tanks, to float to the surface.

The likelihood of liquefaction is influenced by several factors, including the soil type, its density, the presence of water, and the intensity and duration of the shaking. Loose, saturated sands are particularly susceptible. Engineers assess liquefaction potential using geotechnical investigations and seismic hazard analyses to inform the design of structures in earthquake-prone areas and to implement mitigation measures. These measures can include soil improvement techniques like densification or grouting to increase the soil's resistance to liquefaction.