$4\mathrm{.}2$ Explain the following:

$4\mathrm{.}2\mathrm{.}1$ For plane strain conditions, how would you simulate roller boundaries in

FLAC?

$4\mathrm{.}2\mathrm{.}2$ For plane strain conditions, how far should your boundaries be away from

a tunnel being modelled in UDEC?

$4\mathrm{.}2\mathrm{.}3$ What does roller boundaries represent?

$4\mathrm{.}2\mathrm{.}4$ Draw a schematic for typical boundary conditions for plane strain

conditions of a $5m5m$ tunnel at a depth of $50$ m below surface?

$4\mathrm{.}2\mathrm{.}5$ Which software package is able to explicitly simulate fracture initiation and

propagation?

$4\mathrm{.}2\mathrm{.}6$ What type of boundary conditions would you use when modelling dynamic

loading in UDEC, to avoid wave reflection at the boundaries?

$4\mathrm{.}2\mathrm{.}7$ Which software package is able to model saturation of weathered soil

material?

$4\mathrm{.}3$ Explain each of the numerical modelling packages provided below

and give an example of the typical use of each package. UTILISE

THE TABLE FORMAT PROVIDED.

$4\mathrm{.}1\mathrm{.}4$ FLAC$3$D is able to simulate:

a$)$ Inelastic behaviour of rock masses

b$)$ Strain softening

c$)$ Backfill

d$)$ All of the above