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RESISTING FORCES<br />
Resist<strong>in</strong>g forces act oppositely of driv<strong>in</strong>g forces.<br />
The resistance to downslope movement is dependent on<br />
the shear strength of the slope material. And shear<br />
strength is a function of cohesion (ability of particles to<br />
attract and hold each other together) and <strong>in</strong>ternal friction<br />
(friction between gra<strong>in</strong>s with<strong>in</strong> a material).<br />
Chemical Weather<strong>in</strong>g (<strong>in</strong>teraction of water with surface<br />
rock and soil) slowly weakens slope material (primarily<br />
rock), reduc<strong>in</strong>g its shear strength, therefore reduc<strong>in</strong>g<br />
resist<strong>in</strong>g forces.<br />
IMPORTANT: The shear strength of the slope material is<br />
decreased by <strong>in</strong>creas<strong>in</strong>g the pore water pressure<br />
(pressure that develops <strong>in</strong> pore spaces due to the<br />
<strong>in</strong>creased amount of water).<br />
GEOL g406 Environmental Geology S. Hughes, 2003
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