Overview
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ABSTRACT
The liquefaction of soils under seismic loading results from their sudden loss of shear strength due to pore pressure generation. This is dangerous for impacted buildings. Several factors including soil type (sand, silt, clay) determine whether liquefaction occurs and how it evolves. As part of soil surveys for building locations, various methods can be used to assess vulnerability to liquefaction. This article presents the factors responsible for this vulnerability, methods to identify and measure it, risk assessment methods and relevant preventive provisions.
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Read the articleAUTHORS
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Emmanuel JAVELAUD: EDF-DI-TEGG, Aix-en-Provence (France)
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Jean-François SERRATRICE: CEREMA, Aix-en-Provence (France)
INTRODUCTION
Soil liquefaction most often affects soft, sandy, water-saturated soil layers. It manifests itself as a sudden loss of strength which, under unfavorable circumstances, can lead to catastrophic failure.
Earthquakes are at the origin of most disorders linked to soil liquefaction, which appear as induced phenomena in terms of seismic risk.
The least resistant soils are the most vulnerable. The risk is accentuated in the presence of strong movements.
Soil liquefaction caused by earthquakes is known to be the cause of settlement or failure of shallow and deep foundations, endangering supported structures, buildings and engineering structures. Soil liquefaction can also cause damage or destruction to earth structures (embankments, walls, dikes, dams) and port structures (quays, medians).
Lastly, low-lying slopes near bodies of water (sea, lakes) and rivers have often proved vulnerable to this phenomenon, and the scene of catastrophic failures.
This presentation of soil liquefaction is based on post-seismic field observations. It is too vague to be of use given the diversity of situations encountered, but it does cover the main aspects of the problem.
The loss of soil shear strength, seen here as the transition of soil from a solid to a liquid state, relates to the mechanical behavior of soil, and falls within the scope of the basic principles of soil mechanics. As such, the phenomenon of soil liquefaction has been reproduced in the laboratory, enabling us to interpret the mechanisms involved and the role of the factors that control them. These factors are numerous, starting with :
soil type (sand, silt, clay) ;
its compactness;
physical properties ;
site conditions, etc.
These various aspects will be discussed in the first paragraph, where it will be indicated that various definitions have been given of soil liquefaction and its effects, depending on whether we are interested in field observations, the behavior of structures or laboratory tests.
In terms of seismic risk, soil liquefaction represents a real danger for the buildings concerned. In order to reduce the vulnerability of buildings, we need to improve our knowledge of the phenomenon and develop risk assessment methods.
As such, the second paragraph aims to situate the phenomenon of soil liquefaction within the more general framework of dynamic soil behaviour. The principles that emerge from this are enshrined in geotechnical site investigation methods, which are carried out by means...
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KEYWORDS
geotechnical engineering | flow | grounds | earthquake | ground investigations | liquefaction | pressures generations | earthquake risk
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Earthquake-induced soil liquefaction
Bibliography
Websites
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AFPS – French association for earthquake engineering
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GEER – Geotechnical Extreme Events Reconnaissance
Standards and norms
- Règles de construction parasismique. Règles PS applicables aux bâtiments, dites règles PS 92 - NF P 06-013 - 1995
- Calcul des structures pour leur résistance aux séismes. Partie 5 : Fondations, ouvrages de soutènement et aspects géotechniques - NF EN 1998-5 - 2005
- Geotechnical Aspects on Site Evaluation and Foundations for Nuclear Power Plants - IAEA Safety Standards, Safety guide No. NS-G-3.6 - 2004 ...
Regulations
Environment Code
Official Journal of the French Republic
Texts on seismic zoning :
Decree no. 2010-1254 of October 22, 2010 on seismic risk prevention.
Decree no. 2010-1255 of October 22, 2010 delimiting seismicity zones in France.
Decree no. 2015-5 of January 6, 2015 amending article D. 563-8-1 of the Environment Code....
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