Term
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Definition
| There is a landslide velocity scale from 1 to 7 that shows probable destructive significance |
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Term
| How does vulnerability (wrt Landslides) increase? |
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Definition
-increasing population density
-use of marginal land
-rapid land-use change |
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Term
| What are some landslide causes? |
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Definition
-geological
-mechanical
-hydrological
-geomorphological
-biological
-human |
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Term
| What are some landslide effects? |
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Definition
-rock slide
-topple
-mud flow
-rock fall
-debris flow |
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Term
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Definition
| Falls occur on steep slopes with loose rock that periodically detach from a surface on which little or no shear/sliding takes place |
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Term
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Definition
| Toppling involves the forward rotation of rock blocks out of the slope about a point of axis below the centre of gravity of the displaced mass. |
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Term
| What are slide and what kind are there? |
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Definition
Slides involve large volumes of rock or soil moving as an initially coherent mass on a sliding surface. These may occur as:
-rotational slides
OR
-translational slides |
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Term
| What are Rotational Slides? |
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Definition
| Where soil or WEAK rock collapse along a curved rupture surface that forms due to the shear forces in the slope exceeding the shear strength of the soils/rocks. |
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Term
| What are Translational Slides? |
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Definition
| Where blocks of STRONG rock move along a weak fracture in the rock (e.g. jointing, bedding, planes, etc.). Or weak soil moves on top of a hard bedrock interface. |
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Term
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Definition
| Occur when there is a large volume of water present in a mixture of soil and debris. Rather than moving downslope as a coherent mass, the material flows downhill as a chaotic mixture. |
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Term
| What is the Factor of Safety? |
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Definition
FS = resisting forces/driving forces
= shear strength/shear stress
FS > 1.0 represents a stable situation
FS < 1.0 denotes failure |
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