 Jan 2017

psgt.earth.lsa.umich.edu psgt.earth.lsa.umich.edu

The relationship between the shear stresses vs the normal stresses will determine the type of fracture seen and it is called the composite failure envelope KNOW THIS PAGE
Coulomb failure criterion: shear stress = Cohesion + The multiplication between the normal stress and mu is the coefficient of internal friction.
KNOW THE SHEAR FAILURE CRITERIA PAGES !!!
sigma 1 sigma3= sigma failure..... There is a straight line between the failure point of shear stress and the difference between sigma 3 and sigma 1.
There's failure points of larger differences will be of the same angle... in the diagram it;s about 60 degrees. this is the coefficient of internal friction or mu.
IF you generate a fault is always 30 degrees to sigma 1 and 60 degrees to sigma 3
