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N<br />
C<br />
W<br />
D<br />
A<br />
Potential slip plane<br />
(clay).<br />
ROCK<br />
SLOPE STABILITY<br />
Calculate the safety factor<br />
us<strong>in</strong>g D to obta<strong>in</strong> driv<strong>in</strong>g force<br />
and N to obta<strong>in</strong> resist<strong>in</strong>g force.<br />
This is a simplified example, so<br />
the clay layer is assumed to<br />
have constant <strong>in</strong>ternal friction,<br />
i.e., the shear strength is the<br />
same everywhere, when wet.<br />
D = W s<strong>in</strong> A = driv<strong>in</strong>g force<br />
• the downslope component of gravity.<br />
N = W cos A = the normal component of W<br />
• contributes to the shear strength along the slip plane<br />
• contributes to the resist<strong>in</strong>g force.<br />
GEOL g406 Environmental Geology S. Hughes, 2003
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