Engineering Rock Mechanics

Questions and answers: in situ rock stress 43

1

44.2 Add the following 2-D rock stress states, and find the principal

stresses and directions of the resultant stress state.

IO MPa

A4.2 Draw xy and Zm axes for the first stress state, and then plot the
corresponding Mohr circle.

IO MPa

q,~., = 8.1 7, -t .Me 25.0 30.0 Normal stress, Q

5.0 - o,,z, = 20.0,5.0

10.0 1

21.83 -1.83

-1.83 8.17

The stresses transformed to the xy axes are

Draw xy and Em axes for the second stress state, and plot the corres-

ponding Mohr circle.