$($a$)$ You are an engineer tasked with helping to design a tailings

storage embankment that will contain saturated sand

tailings that mostly contain pyrite. Describe what measures

you need to take into account when designing the

embankment and the toe and blanket drains.

$($b$)$ What method would you use to determine the hydraulic

conductivity of these tailings? Describe, using a diagram,

how you would work through this method, and which

equation you would use to determine the hydraulic

conductivity.

$($c$)$ Draw total stress, pore water pressure and effective stress

profiles of the tailings below for flooding conditions.

Pond level $($flooding$)=4710m$

Top of tailings level $=4714m$

Base of tailings level $=4739m$

Unit weight of water $=10k\frac{N}{m^3}$

Unit weight of saturated tailings $=19k\frac{N}{m^3}$

$($d$)$ During discharge of the tailings in $($a$)$ of this question to the

impoundment a layer of fine clay was also discharged so

that it ended up sandwiched by the tailings in $($a$)$ at $7m$

depth. Explain how you would determine the settlement of

the tailings surface after $100$kPa loading of additional

tailings. Also include information on the additional

parameters you would need to determine.