Strategies To Reduce Mass Movement

Question 1

Pinning

Answer 1

Drilling deep within the rocks and sticking long metal rods inside.
Stabilises the rock.

Question 2

Netting

Answer 2

Metal Netting is fastened to rock/cliff faces.
Prevents loose blocks from falling below.
Use commonly above roads.

Question 3

Gabions

Answer 3

Metal mesh boxes filled with rocks places in front of cliff faces.
Stabilises the rock and protects area below.

Question 4

Drainage

Answer 4

Digging small trenches roadside and filling them w gravel.
Water is absorbed as gravel is highly permeable.
Prevents water from being clogged on slope causing landslide.

Question 5

Grading

Answer 5

Gently cutting flat planes into rocks.
Steeper slopes are more unstable.
Grading removed the slope completely.

Question 6

Afforestation

Answer 6

Planting vegetation binds soil, increases interception, evaporation with roots reducing the risk mass movements.
Less water in the soil reduces them chance is land slip.

Question 7

Grouting

Answer 7

Injecting permeable rocks w cement to reduce permeability and stabilise slope.

Question 8

Shotcrete

Answer 8

Loose rock surfaces can be sprayed w/ concrete.

Prevents loose rocks from falling/fracturing/collapsing from a cliff face.

Question 9

Mapping Hazards

Answer 9

Detailed mapping of an area allows knowledges of which slope may need stabilising, or which may have previously collapsed.