Landslide mapping and mitigation

Question 1

what do we need to know to be able to mitigate a landslide? what displays this information?

Answer 1

1. location
2. size (magnitude)
3. frequency

shown by landslide mapping

Question 2

two main categories of landslide mitigation

Answer 2

1. structures

2. monitoring

Question 3

what are some of the things we can monitor

Answer 3

1. surface movement

2. groundwater (vibrating wire piezometers)

Question 4

what is the purpose of a landslide mitigation structure

Answer 4

increase safety factor of the slope

Question 5

landslide mitigation structure must be founded ______ the landslide slip plane.

Answer 5

below

Question 6

3 examples of structures as landslide mitigation

Answer 6

1. Masonary retaining walls (founded on rock)
2. gabion retaining walls
3. Mechanically stabilized earth

Question 7

mechanically stabilized earth (MSE)

Answer 7

rely on tensile strength of anchors or geogrids to provide wall capacity

Question 8

example of MSE

Answer 8

soil nails

Question 9

embedded retaining walls

Answer 9

• use lateral capacity of deep piles to stabilise the ground
• used in excavations and natural slopes
• generally timber or concrete

Question 10

trim blasting

Answer 10

used to remove overhanging rock

Question 11

most common landslide triggering event is ________. Whereas, __________ cause the largest and most destructive landslides.

Answer 11

rainfall.

earthquakes.