Geohazards - Mass Movements Flashcards
1
Q
what is a rockfall?
A
-rocks falling down due to weathering and increased pore pressure
2
Q
what is rotational slip?
A
- rocks slide over a large mass
- normal faulting can occur
3
Q
what is a rock slide?
A
-rocks sliding over the bedding planes
4
Q
what are the causes of instability? (4 points)
A
- increased slope angle
- undulating
- weathering
- rainfall
5
Q
what are some triggers for mass movements? (4 points)
A
- vibrations from machinery
- earthquakes (fault movement)
- explosions
- heavy rain
6
Q
what are the monitoring methods for mass movements?
A
- distribution of boreholes
- pore pressure changes
- seismic activity (geophones)
- tiltmeter
- GPS
- EDM
7
Q
what are the mitigation strategies for sediment movement?
A
- gabions
- retaining wall
- changing angle of slope (benches)
- drainage
- vegetation
- geomembranes
8
Q
what are the mitigation strategies for rock movement?
A
- rock bolts
- rock armour
- catch nets
- shotcrete
- drainage
- benches
- retaining wall
- gabions
