Geology Reference
In-Depth Information
(continued)
Hazard
Possible mitigation measures prior to
and during construction to reduce
likelihood or consequence of hazard
Impact of
mitigation
measures and
risk
Summary of main
residual risks
Title
Example of
circumstances
Notes
*
indicates technique more likely
than others to be useful
6. use concrete rather than spheroidal
steel lining
7. post construction microgravity
survey (gradiometry) along line of
tunnel to locate and determine size of
cavities in vicinity (30m radius) of
tunnel
8. consider also likelihood of hazards:
1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 16 and 17
6. post construction
damage to tunnel lining
7. higher risk of water inrush
through damaged lining
17
Contaminated
ground
industrial and
domestic
ef
L
1. GI boreholes proving contamination
2. GI investigation identifying post
mining uses of mine shafts and adit
s*
3. pre-construction geological desk
study and risk assessment
*
4. monitoring of spoil properties during
tunnellin
g*
5. monitoring of tunnel atmosphere
6. consider also likelihood of hazards:
1, 2, 3, 7, 8, 9, 10, 11, 12, and 16
L
L
L
1. failure to identify
contaminants
2. higher risk of hazard 2
from petroleum wastes
3. injury (short and long-
term) to workforce
4. selection of incorrect
tunnel lining
5. corrosion of tunnel lining
uents
disposed of
down mine
shafts
