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Sinking during earthquakes: Critical acceleration criteria control drained soil liquefaction
C Clément1, R Toussaint1,2, M Stojanova1,3
1Institut de Physique du Globe de Strasbourg, Université de Strasbourg, CNRS, UMR 7516, 67084 Strasbourg Cedex, France.
Physical Review. E
|March 18, 2018
Summary
This study models soil liquefaction, showing water
Area of Science:
- Geotechnical Engineering
- Earthquake Engineering
- Soil Mechanics
Background:
- Earthquakes can trigger soil liquefaction, transforming stable soil into a fluid-like state.
- This phenomenon poses significant risks to structures built on or in the ground.
- Understanding the mechanisms of liquefaction is crucial for mitigating earthquake damage.
Purpose of the Study:
- To develop a theoretical model for soil liquefaction.
- To investigate the influence of water-induced buoyancy on soil stability.
- To establish conditions and dynamics of liquefaction.
Main Methods:
- Theoretical modeling of soil liquefaction.
- Laboratory experiments with granular materials and controlled oscillations.
- Discrete-element numerical simulations using molecular dynamics.
Main Results:
- Buoyancy significantly impacts the stability of objects on saturated granular soils.
- Liquefaction onset depends on soil density, friction, water presence, and ground motion intensity.
- Object sinking follows exponential relaxation towards isostatic equilibrium, influenced by peak ground velocity.
Conclusions:
- The proposed model accurately predicts liquefaction behavior.
- Buoyancy is a key factor in liquefaction dynamics.
- A phase diagram is established for predicting liquefaction under various conditions.
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