Publication

Micromechanical Modelling of Elastic Wave Velocity Variations for Intact Brittle Rocks

2021
Student Projects

Abstract

Until now, the micromechanical wing crack model of Ashby & Sammis 1990 describing the brittle field of rocks has only been used for failure predictions. However, it gives relevant information regarding the crack opening process, so this model is extended to compute elastic wave speeds according to the cracked solid theory of Kachanov. Laboratory experiments at various confining pressures on Westerly granite were realised to fit its parameters and test this extension. A decent correlation between modelled and measured velocities shows that this model might be used for seismic velocities and crack-induced anisotropy computation. Furthermore, the validity of the model is discussed through an energy budget and comparisons with in-situ measurements of velocity changes.

Official source

https://infoscience.epfl.ch/entities/publication/af94c9d3-46ad-48c0-b8d2-6a031411aecb

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2021
Student Projects

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/af94c9d3-46ad-48c0-b8d2-6a031411aecb

About this result

Related concepts (32)

Seismic wave

A seismic wave is a mechanical wave of acoustic energy that travels through the Earth or another planetary body. It can result from an earthquake (or generally, a quake), volcanic eruption, magma movement, a large landslide, and a large man-made explosion that produces low-frequency acoustic energy. Seismic waves are studied by seismologists, who record the waves using seismometers, hydrophones (in water), or accelerometers.

Velocity

Velocity is the speed and the direction of motion of an object. Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies. Velocity is a physical vector quantity: both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called , being a coherent derived unit whose quantity is measured in the SI (metric system) as metres per second (m/s or m⋅s−1). For example, "5 metres per second" is a scalar, whereas "5 metres per second east" is a vector.

Angular velocity

In physics, angular velocity (symbol ω, sometimes Ω), also known as angular frequency vector, is a pseudovector representation of how the angular position or orientation of an object changes with time, i.e. how quickly an object rotates (spins or revolves) around an axis of rotation and how fast the axis itself changes direction. The magnitude of the pseudovector, , represents the angular speed (or angular frequency), the rate at which the object rotates (spins or revolves).

Related publications (7)

Micromechanical Modelling of Elastic Wave Velocity Variations for Intact Brittle Rocks

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Isotropic fluid-saturated microcracked rocks exhibit anisotropic response at the time of measurement

Origin of the Temporal Evolution of Elastic Properties During Laboratory Seismic Cycle

A-seismic fracture growth driven by fluid injection and remote nucleation of dynamic rupture in a weaker part of the fault