Engineering Rock Mechanics

Question and answers: foundation and slope instability mechanisms 305

P

,,/ __.-- ---.. -..

CHILE material

'\

\ radial stress

i contours

I '*.. i constrained to lie

I i within friction

I ....

boundaries

friction boundaries I '*.

.....

defined by

orientation of

fracture set

*I.. ... ................. ........

(d) The diagram above illustrates that whenever engineering is taking
place in DIANE rocks, we should expect the geometry of the induced
stress fields to be different from those predicted using CHILE models. In
the case of site investigation in layered rocks, the depth to which a given
stress is induced can be much greater than that predicted using a CHILE
model, indicating that the rock mass should be investigated over a wider
and deeper zone than a CHILE model would suggest.

417.9 The system of rock blocks shown in the sketch below is to be
used in the verification procedure of a computer code for analysing
progressive failure of rock slopes, and for this a manually derived
solution is required.
The system is in limiting equilibrium with block A tending to topple