Geohazards - Engineering

Question 1

why is a raft foundation important?

Answer 1

spread weight over a wide area so good for soft sediment

Question 2

why are pylons important?

Answer 2

dig into stable rock which then stabilizes the building on soft sediment

Question 3

what do you need to take into consideration when building tunnels? (8 points)

Answer 3

• orientation
• the water table
• weathering
• joint density
• fracture and foliation density
• gas build up
• flooding
• tunnel collapse

Question 4

what are swelling clays and what does it do to foundations?

Answer 4

• clays within the soil can absorb water and expand which causes foundations to flex and crack
• causes subsidence

Question 5

what are the steps in Brownfield Remediation?

Answer 5

• site investigation -> find out what could be at the site
• intrusive on-site investigation -> boreholes to see if you can mine anything or build upon it (due to bad geology)
• remediation works -> phytoremediation, groundwater treatment and stabilization and solidification
• verification and validation ->brownfield site now suitable to do works on