2. Slope = rise / run
The slope of a line is the ratio
of the amount that Y increase
as X increase some amount
Slope tell you how steep a line
is , or how much Y increase as
X increase.
The slope is constant (the
same) any where on the line.
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3. Slope stability is the process of calculating
and assessing how much stress a
particular slope can manage before failing.
Examples of common slopes include roads for
commercial use, dams, excavated slopes, and
soft rock trails in reservoirs, forests, and parks
Slope stability is the potential of the soil
covered slopes to withstand and undergo
movement
Stability is determined by the balance of
the share stress and share strength
A previously stable slop may be initially
affected by the preparatory factors ,
making the slop conditionally unstable.
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4. • The term landslide or less frequently, landslip, to several forms of mass wasting that
may include a wide range of ground movements, such as rock falls, deep-
seated slope failures, mudflows, and debris flows. However, influential narrower
definitions restrict landslides to slumps and translational slides in rock and regolith, not
involving fluidization. This excludes falls, topples, lateral spreads, and mass flows from the
definition
• Landslides occur in a variety of environments, characterized by either steep or gentle
slope gradients, from mountain ranges to coastal cliffs or even underwater, in which
case they are called submarine landslides. Gravity is the primary driving force for a
landslide to occur, but there are other factors affecting slope stability that produce
specific conditions that make a slope prone to failure. In many cases, the landslide is
triggered by a specific event (such as a heavy rainfall, an earthquake, a slope cut to build
a road, and many others), although this is not always identifiable. 4
6. CONCEPTS OF
EQUILIBRIUM
6
Slope of the equilibrium with their
environment typically exhibit
concave straight and convex hill-
slope.
Slope out of equilibrium typically
anomalous hummocky profile
8. RESISTANCE GEOLOGIC UNITS
• Steeped topography is not
necessarily indicative of the slope
instability , but can be structurally
controlled by the underlying
stratigraphy.
• Shale are most often associated
with landslides.
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9. Immature – uplifted exceeds erosion
Slop that are experiencing rampant erosion are typically out of equilibrium , and
exhibit truncated slope profile.
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10. The slope profile is also influenced by
the run off requirement and the relative
position of controlling base level as
sketched here
Note change in hill profile as channel
move away from the ridgeline
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11. The geographic cycle, or cycle of erosion, is an idealized model that
explains the development of relief in landscapes. The model starts with
the erosion that follows uplift of land above a base level and ends , if
conditions allow, in the formation of a pen plain.
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13. 13
Continuity of an erosion cycle with gradual shit of the hill-slope resulting in
the hummocky topography. Hummocky slopes typical of slopes experiencing
the land slippage.
