Slopes

Question 1

Unstable slopes

Answer 1

Clays
Most rocks
Planar weakness
Potential failure

Question 2

Types of failure

Answer 2

Large rock- planar/ wedge slices
Small rock- falls/ toppled
Mud slides- flows or debris flows weak clays or failed rock materials
Complex failures- multiple processes

Question 3

Speed of failure

Answer 3

Slow- soft clays and ductile materials
Rapid- brittle rock weakened by initial failure or fracture
Cyclic- stable slope as de Tia becomes toe weight

Question 4

Landslide trigger processes

Answer 4

Cause- trigger event + structure
Water- ground water pressure
Toe removal- removes resistance to movement
Natural- undercutting
Artificial- toe removal, quarrying mining
Strength reduction- weathering
Vibration- soil restructuring or rock fracture
Earthquake- vibration

Question 5

Slope failures

Answer 5

Planner slide
Wedge failure
Rockfall
Rock topple
Single rotation
Multiple rotation 
Block slide
Mud flow