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SLOPE STABILITY<br />
• When is a slope not stable?<br />
• Slope stability is based on the <strong>in</strong>terplay between two<br />
types of forces:<br />
driv<strong>in</strong>g forces and resist<strong>in</strong>g forces.<br />
• Driv<strong>in</strong>g forces promote downslope movement of<br />
material.<br />
• Resist<strong>in</strong>g forces deter movement.<br />
• When driv<strong>in</strong>g forces overcome resist<strong>in</strong>g forces, the slope<br />
is unstable and results <strong>in</strong> mass wast<strong>in</strong>g.<br />
• The ma<strong>in</strong> driv<strong>in</strong>g force <strong>in</strong> most land movements is<br />
gravity.<br />
• The ma<strong>in</strong> resist<strong>in</strong>g force is the material's shear strength.<br />
GEOL g406 Environmental Geology S. Hughes, 2003
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