The only thing to fear is shear itself.
Don't fear the shear. Soils lab from yesterday. The shear line is almost a perfect example of what is suppose to happen.
We are getting into Mohr-Coulomb_theory .
http://www4.hcmut.edu.vn/~cnan/Principles%20of%20geotechnical%20engineering%20%28Fifth%20Edition,%20Das%29/311-363.PDF
Direct shear lab: http://1drv.ms/1hjYPr6 homework 8: http://1drv.ms/1o7QtkT
Text book examples: tex book .PDF
