GFM 2
lectures 3 and 4
lectures 3 and 4
on Mohrs circle
.
equation for straight line on a Mohrs circle
.
what does c represent on a Mohrs circle
cohesion
graph of confining pressure and stress
.
how much bigger are compressive strengths of rocks than tensil
10-20
temperature and strain rate graph
.
pore pressure and strength graph
.
what is dilatancy
when volume increases with compression
2 methods of measuring dilatancy
fluid flowing into or out of pores
strain gauges to measure longitudingal and lateral strains.
What is an acoustic emmission
The propagation of a microcrack causes an elastic wave, which can be detected audibly
4 stages of brittle failure
1 closing of cracks and pore space
2 elastic behavior
3 microcracking
4 break-microcracks link to form hear plane
Posissons Ratio
the ratio between strain imposed on a sample in one direction and the resulting strain perpendicular to this direction
U
total energy
(Griffith’s cracks)
Um
mechanical energy
(Griffith’s cracks)
Us
Surface energy
(Griffith’s cracks)
equilibrium point on Griffith's cracks graph
.
mu
(Mohrs)
internal friction
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Cartes-fiches
on Mohrs circle
.
equation for straight line on a Mohrs circle
.
what does c represent on a Mohrs circle
cohesion
graph of confining pressure and stress
.
how much bigger are compressive strengths of rocks than tensil
10-20
temperature and strain rate graph
.
pore pressure and strength graph
.
what is dilatancy
when volume increases with compression
2 methods of measuring dilatancy
fluid flowing into or out of pores
strain gauges to measure longitudingal and lateral strains.
What is an acoustic emmission
The propagation of a microcrack causes an elastic wave, which can be detected audibly
4 stages of brittle failure
1 closing of cracks and pore space
2 elastic behavior
3 microcracking
4 break-microcracks link to form hear plane
Posissons Ratio
the ratio between strain imposed on a sample in one direction and the resulting strain perpendicular to this direction
U
total energy
(Griffith’s cracks)
Um
mechanical energy
(Griffith’s cracks)
Us
Surface energy
(Griffith’s cracks)
equilibrium point on Griffith's cracks graph
.
mu
(Mohrs)
internal friction
